AIM-ATM, AIM-VOICE-30, and AIM-ATM-VOICE-30 for the Cisco 2600 Series and Cisco 3660

Table Of Contents

AIM-ATM, AIM-VOICE-30, and AIM-ATM-VOICE-30 on the Cisco 2600 Series and Cisco 3660

Feature Overview

Benefits

Restrictions

Related Features and Technologies

Related Documents

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Configuring Network Clock Source and Participation

Configuring AIM for ATM WAN Access

Configuring AIM for ATM WAN Access with IMA

Configuring AIM for VoIP, VoATM, or VoFR

Verifying AIM Configuration

Troubleshooting Tips

Configuration Examples

ATM AIM for ATM with IMA Configuration Example

AIM DSP for VoIP Configuration Example

Command Reference

clock source (T1/E1 Controller)

dspfarm (voice-card)

mode (T1/E1 Controller)

network-clock-participate

network-clock-select

voice-card

Glossary

AIM-ATM, AIM-VOICE-30, and AIM-ATM-VOICE-30 on the Cisco 2600 Series and Cisco 3660

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Feature History

Release	Modification
12.2(2)XA	The High-Performance ATM Advanced Integration Module (AIM-ATM) was introduced for support of AAL2 and AAL5 services on the Cisco 2600 series.
12.2(2)XB	The following capabilities were added to this feature: •Support for the High-Performance ATM Advanced Integration Module (AIM-ATM) on the Cisco 3660 •Two new types of Advanced Integration Modules (AIMs): –AIM-VOICE-30, which provides support for voice digital signal processing (DSP) services for the Cisco 2600 series and the Cisco 3660 –AIM-ATM-VOICE-30, which combines support for both ATM and voice DSP services for the Cisco 2600 series and the Cisco 3660 •Support for Inverse Multiplexing over ATM (IMA) for the Cisco 2600 series and Cisco 3660 •Support for Fast Ethernet network modules (NM-2W on the Cisco 2600 series, and NM-2W, NM-1FE2W, and NM-2FE2W on the Cisco 3660) with multiflex trunk Voice/WAN Interface Cards (VWICs) (VWIC-MFT)

This document describes configurations for the AIM-ATM, AIM-VOICE-30, and AIM-ATM-VOICE-30 on the Cisco 2600 series and the Cisco 3660. It includes the following sections:

•Feature Overview

•Supported Platforms

•Supported Standards, MIBs, and RFCs

•Prerequisites

•Configuration Tasks

•Configuration Examples

•Command Reference

•Glossary

Feature Overview

Three types of AIM provide Cisco 2600 series and Cisco 3660 routers with components that provide the following ATM and voice processing services:

•Segmentation and reassembly (SAR) of packets for ATM transport over a wide-area network (WAN), utilizing ATM Adaptation Layer 2 (AAL2) and AAL5 encapsulation and providing ATM WAN uplinks on up to four T1/E1 links

•Digital signal processing (DSP) for voice conversion, providing termination and processing of up to 30 voice channels per AIM

The Cisco 2600 series has one internal slot for an AIM, and the Cisco 3660 has two. The three types of AIM are as follows:

•AIM-ATM—A High-Performance ATM AIM, which enables voice and data traffic to be carried over ATM networks using AAL2 and AAL5 encapsulation, when installed in Cisco 2600 series or Cisco 3660 routers. If used in conjunction with a T1/E1 multiflex trunk voice/WAN interface card (VWIC-MFT) for circuit-mode data and frame-mode data over ATM infrastructures, it supports up to four T1 or E1 WAN interfaces. These interfaces may be four independent links or four inverse multiplexing over ATM (IMA) groups. When using the voice DSP capability of a digital T1/E1 packet voice trunk network module (NM-HDV) and a T1/E1 multiflex trunk VWIC, it supports as many as 30 channels of compressed voice over a T1/E1 trunk using AAL2 or AAL5. Analog Voice over ATM (VoATM) is enabled with a voice/fax network module (NM-1V or NM-2V) and a voice interface card, which support as many as four analog voice calls using AAL5. All voice interface cards are supported: FXS, FXO, Analog-DID, E&M, and BRI.

•AIM-VOICE-30—An advanced integration module capable of supporting up to 30 voice or fax channels when used in a Cisco 2600 series or Cisco 3660 router with one of the T1/E1 voice/WAN interface cards (such as VWIC-1T1). This AIM includes powerful DSPs that are used for a number of voice processing tasks such as voice compression and decompression, voice activity detection or silence suppression, and private branch exchange (PBX) or public switched telephone network (PSTN) signaling protocols. By using the AIM-VOICE-30 in a Cisco 2600 series router, customers can support Voice over IP (VoIP) or Voice over Frame Relay (VoFR) while leaving the router's network module slot open for other functions such as asynchronous or synchronous serial concentration. When used in combination with one of the various ATM network modules, VoATM or VoIP over ATM can be provisioned using AAL5 and Voice over AAL2 (VoAAL2).

•AIM-ATM-VOICE-30—a combined ATM and DSP AIM that supports voice over ATM (VoATM), voice over IP (VoIP), and voice over Frame Relay (VoFR). It supports as many as four T1 or E1 trunks when installed in a Cisco 2600 series or Cisco 3660 router. This AIM is used in combination with one T1/E1 multiflex trunk interface (VWIC-MFT) to provide PBX or PSTN signaling protocols. It uses VoAAL2 (ITU I.366.1/I.363.2) and VoAAL5, and does not require use of a digital T1/E1 packet voice trunk network module. This AIM has an onboard ATM coprocessor for increased AAL2 and AAL5 performance, and for as many as four IMA groups, enabling fractional T3 or E3 bandwidth performance.

See Table 1 for a summary of capabilities and voice interface hardware for each platform.

General features for all three types of AIM include:

•One AIM can be installed on a Cisco 2600 series router, and up to two AIMs on a Cisco 3660

•Online insertion and removal (OIR) is supported for the network modules that interoperate with AIMs on Cisco 3660 routers, although not for the AIMs themselves

ATM features for AIM-ATM and AIM-ATM-VOICE-30 include:

•For Cisco 2600 series routers, up to four ATM ports using multiflex trunk VWICS located either in WIC slots or in network modules, such as fast Ethernet network modules or digital T1/E1 packet voice trunk network modules

•For Cisco 3660 routers with two AIMs, up to eight ATM ports using multiflex trunk VWICS located in network modules, such as Fast Ethernet network modules or digital T1/E1 packet voice trunk network modules

•AAL5 and AAL2 services

•IMA 1.1 support for up to four IMA links per AIM

•Up to 1024 AAL5 VCs for data or voice features per AIM

•Up to 1024 AAL2 VCs with up to 255 subchannels each for voice per AIM

•Network clock management support for synchronization between the ATM network and a PBX or the PSTN

Voice DSP features for AIM-VOICE-30 and AIM-ATM-VOICE-30 include:

•Voice AIMs support all the same signaling types that are normally supported on T1 and E1 lines connected to NM-HDV network modules

•Integration of complete network management (Simple Management Network Protocol [SNMP], Cisco Voice Manager [CVM], CiscoView)

•VoIP, VoFR, VoAAL5, and VoAAL2

•Voice over AAL5

–Cisco AAL5 switched-voice support

–VoIP over ATM

–Transparent Common Channel Signaling (T-CCS)

•Voice over AAL2

–Nonswitched VoAAL2 trunking support

–Voice compression with AAL2 for subcell multiplexing on multiple calls

–Transparent Common Channel Signaling (T-CCS)

•Medium complexity DSP firmware, including the following codecs: G.711 u-law, G.711 a-law, G.729a, G.729ab, G.726r16, G.726r24, G.726r32, clear channel, and fax-relay.

•Up to 30 simultaneous voice calls per AIM

•Up to 60 simultaneous voice calls using DSPs on digital T1/E1 packet voice trunk network modules

Figure 1 represents applications that require both data and voice, as well as T1 or E1 ATM connections. In this scenario, voice is transmitted over ATM using AAL2 protocol. Bandwidth efficiency is achieved by powerful DSPs driving a full range of codecs and subcell multiplexing. By using a digital T1 or E1 packet voice trunk network module (NM-HDV), this configuration supports up to 60 channels of compressed voice over a T1 or E1 ATM trunk. In this scenario, PBXs can be directly connected to the NM-HDV, allowing for VoIP, VoFR, or VoATM support. Data traffic over AAL5 can be combined with voice-specific traffic.

Figure 1 AIM-ATM Providing ATM and Network Module Providing Voice DSP

Figure 2 illustrates a router with a network module that is being used for services other than voice. Applications on this router are limited to 30 or fewer voice or fax channels. When an AIM-VOICE-30 is used in conjunction with a T1 or E1 voice/WAN interface (such as VWIC-1MFT-T1/E1), it can provide voice processing such as VoIP or VoFR in conjunction with a PBX within the branch office, leaving the network module slot open for other applications. Note that you cannot process the T1 or E1 voice on the same VWIC as the serial WAN connection. They have to use different VWICs.

Figure 2 AIM-VOICE-30 Providing DSP for Voice

Figure 3 depicts applications that require AAL5 or AAL2 support over T1 or E1 ATM connections. This configuration leaves the network module slot open for existing or future needs. In this example, the AIM-ATM-VOICE-30 combines all of the AIM features shown in Figure 1 and Figure 2, including support of up to 30 channels of compressed voice using AAL2 (ITU I.366.1/I.363.2) and VoAAL5 with the support of a T1/E1 voice/WAN interface (VWIC-1MFT-T1/E1) connected to a PBX, without requiring a digital T1/E1 packet voice trunk network module. In addition, the AIM-ATM-VOICE-30's segmentation and reassembly (SAR) coprocessor functionality provides AAL2 and AAL5 performance and as many as four IMA groups, enabling fractional T3/E3 bandwidth performance.

Figure 3 AIM-ATM-VOICE-30 Providing ATM and DSP for Voice

Table 1 lists the applications and voice interfaces that can be used with the three types of AIM:

Table 1 AIM-ATM, AIM-VOICE-30, and AIM-ATM-VOICE-30 Applications

Application	Platform	AIM	Interface
1- to 4-port T1/E1 Data and Analog Voice over an ATM Network	Cisco 2600 series and Cisco 36601	AIM-ATM	•Two-port voice interface card (VIC-2FXS) in a voice/fax network module (Any NM-1V or NM-2V card: FXS, FXO, E&M, DID, and BRI are supported) •Multiflex trunk VWIC (VWIC-1MFT, for example)
1- to 4-port T1/E1 Data over an ATM Network	Cisco 2600 series	AIM-ATM	Multiflex trunk VWIC (VWIC-1MFT, for example) in one of the following: •WIC slot •Digital T1/E1 packet voice trunk network module (NM-HDV) •Fast Ethernet network module (NM-2W)
1- to 4-port T1/E1 Data over an ATM Network	Cisco 36601	AIM-ATM	Multiflex trunk VWIC (VWIC-1MFT, for example) in one of the following: •Digital T1/E1 packet voice trunk network module (NM-HDV) •Fast Ethernet network module (NM-2W, NM-1FE, or NM-2FE)
1- to 4-port T1/E1 Data over an ATM Network with IMA	Cisco 2600 series and Cisco 36601	AIM-ATM	Multiflex trunk VWIC (VWIC-1MFT, for example) in one of the following: •WIC slot (Cisco 2600 series only) •Digital T1/E1 packet voice trunk network module (NM-HDV) •Fast Ethernet network module (NM-2W)
1- to 4-port T1/E1 Data and Digital Voice over an ATM Network with IMA	Cisco 2600 series and Cisco 36601	AIM-ATM-VOICE-30
1- to 4-port T1/E1 Data and Digital Voice over an ATM Network	Cisco 2600 series	AIM-ATM-VOICE-30	Multiflex trunk VWIC (VWIC-1MFT, for example) in one of the following: •WIC slot •Digital T1/E1 packet voice trunk network module (NM-HDV) •Fast Ethernet network module (NM-2W)
1- to 4-port T1/E1 Data and Digital Voice over an ATM Network	Cisco 36601	AIM-ATM-VOICE-30	Multiflex trunk VWIC (VWIC-1MFT, for example) in one of the following: •Digital T1/E1 packet voice trunk network module (NM-HDV) •Fast Ethernet network module (NM-2W, NM-1FE, or NM-2FE)
Digital Voice	Cisco 36601	AIM-VOICE-30	Multiflex trunk VWIC (VWIC-1MFT, for example) in a Fast Ethernet network module (NM-2W, NM-1FE, or NM-2FE)
Digital Voice	Cisco 2600 series	AIM-VOICE-30	Multiflex trunk VWIC (VWIC-1MFT, for example) in one of the following: •WIC slot •Fast Ethernet network module (NM-2W)

1 Cisco 3660 routers also require multiservice interchange (MIX) modules (MIX-3660-64) installed for use of AIMs.

Benefits

•Introduces VoATM on the 2600

•Introduces VoAAL2 support on the 3660 and 2600

•Inexpensive ATM access

•Dedicated onboard AIM hardware-accelerated coprocessor, capable of supporting both AAL2 (ITU I.366.1/I363.2) and VoAAL5, which offloads the processor-intensive task of ATM cell segmentation and reassembly from the main router CPU.

•ATM WAN uplink option for Cisco 2600 series routers without using a network module slot

•AAL2 or AAL5 encapsulation for high quality of service (QoS) and a low-cost alternative to circuit-based services

•Efficient prioritization of mission-critical data provided by ATM's QoS

•Low-density T1 or E1 ATM option on an AIM form factor, providing a VoATM, VoIP, or VoFR solution supporting up to four T1 or four E1s

•Inverse multiplexing over ATM (IMA) for connection of up to four T1s or E1s, for the most effective use of available slots

•No need for third-party IMA devices

•Migration path to higher bandwidth without the need to change transport facilities

•Highly competitive voice processing (termination) solution with AIM-VOICE-30 at a density of 30 VoIP, VoFR voice, or fax channels, while not consuming a network module slot

Restrictions

•High codec complexity is not supported for DSP processing.

•Only one T1 or E1 interface can be used to support DSP functionality.

•Cisco 3660 routers must be configured with a multiservice interchange (MIX) module.

•On Cisco 2600 series routers, if some DSP functionality is used for one port, the remaining cannot be used on the other port.

•Frame Relay and ATM cannot be configured on two different ports of one WIC card in a Cisco 2600 WIC slot.

•AAL2 supports a permanent virtual circuit (PVC); AAL5 supports PVC and a switched virtual circuit (SVC). Note that voice is supported only on PVCs. The SVC support on AAL5 is for data only.

•Subcell multiplexing is defaulted and is not configurable.

•A maximum of four IMA groups can be configured on a Cisco 2600 series router with one AIM installed, or on a Cisco 3660 router with either one or two AIMs installed.

•IMA cannot be multiplexed across two different AIM-ATMs or AIM-ATM-VOICE-30s on a Cisco 3660.

•When using Cisco 2600 WIC slots, data wide-area networks cannot be configured using the DSPs of AIM-VOICE-30 or AIM-ATM-VOICE-30.

•When using AIM-ATM, AIM-VOICE-30, or AIM-ATM-VOICE-30, the number of virtual path identifier (VPI) and virtual channel identifier (VCI) bits is 13 bits. The VPI default is five bits with a range of 0 to 31; the VCI default is eight bits with a range of 1 to 255. A 100/200 permanent virtual circuit (PVC) is not possible, because the maximum number of bits for VPI/VCI is 13.

•An AIM-ATM-VOICE-30 can support a maximum of four interfaces (8 MB TDM stream from the AIM-ATM-VOICE-30). There cannot be, for instance, four ATM interfaces and two voice or DSP interfaces.

•For variable-bit-rate, real-time (VBR-RT) traffic shaping, the maximum burst size (MBS) is 255 cells.

•The lowest traffic shaping parameter supported is 32 kbps.

•VBR.3/CLP tagging is not supported.

Related Features and Technologies

•Voice over IP

•Voice over ATM and Inverse Multiplexing over ATM

•Voice over Frame Relay

Related Documents

•Installation of AIM modules is described in Installing the High Performance ATM Advanced Integration Module in Cisco 2600 Series Routers.

•Clock sources on individual ports are explained in the "Clock Sources on Digital T1/E1 Voice Ports" section in the "Configuring Voice Ports" chapter of the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2.

•Configuration of VoATM with AAL2 or AAL5 encapsulation is described in Configuring AAL2 and AAL5 for the High-Performance Advanced Integration Module on the Cisco 2600 Series, Cisco IOS Release 12.2(2)XA.

•ATM and IMA for the Cisco 2600 series and Cisco 3660 are described in ATM Software Segmentation and Reassembly (SAR), Cisco IOS Release 12.2(2)XB.

•Inverse Multiplexing over ATM (IMA) configuration is described in the "Configuring ATM" chapter in the Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2.

•Configuration of VoIP, VoATM, and VoFR are described in the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2.

•ISDN configuration is described in the "Configuring ISDN Interfaces for Voice" chapter in the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2.

•Configuration of the MIX module on the Cisco 3660 is covered in the online document Multiservice Interchange (MIX) for Cisco 3600 Series Multiservice Platforms, Release 12.1(5)XM.

•Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2

•Cisco IOS Wide-Area Networking Command Reference, Release 12.2

The following sites contain hardware installation and configuration guides, as well as regulatory and safety information:

•Cisco 2600 series

•Cisco 3600 series

Supported Platforms

•Cisco 2600 series

•Cisco 3660

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

No new or modified RFCs are supported by this feature.

Prerequisites

Cisco 2600 series

•Cisco IOS Release 12.2(2)XB IP Plus or a later release

•64 MB RAM and 16 MB Flash memory

•Appropriate voice interface hardware, as listed in Table 1

•Voice over ATM, Voice over IP, or Voice over Frame Relay network (See the appropriate document from the "Related Documents" section).

Cisco 3660

•Cisco IOS Release 12.2(2)XB IP Plus or a later release

•64 MB RAM and 16 MB Flash memory

•MIX module (MIX-3660-64) installed in the time-division multiplexing (TDM) slot on the motherboard

•Appropriate voice interface hardware as listed in Table 1

•Voice over ATM, Voice over IP, or Voice over Frame Relay network (See the appropriate document from the "Related Documents" section).

Configuration Tasks

See the following sections for configuration tasks for the AIM-ATM, AIM-VOICE-30, and AIM-ATM-VOICE-30 on the Cisco 2600 series and Cisco 3660 feature. Each task in the list indicates if the task is required or optional.

•Configuring Network Clock Source and Participation (Required for all AIMs)

•Configuring AIM for ATM WAN Access (Required for AIM-ATM or AIM-ATM-VOICE-30)

•Configuring AIM for ATM WAN Access with IMA (Optional for AIM-ATM or AIM-ATM-VOICE-30)

•Configuring AIM for VoIP, VoATM, or VoFR (Required for AIM-VOICE-30 or AIM-ATM-VOICE-30)

Configuring Network Clock Source and Participation

Packet voice and video are sensitive to time delays. To prevent mismatches and data slips, you must synchronize data flows to a single clock source, known as the network clock. When a network clock is configured on a gateway, the router externally clocks one T1 or E1 port, and then passes that clock signal across the backplane to another T1 or E1 port on another WIC or network module slot. Use of a network clock on a gateway is configured by naming the network modules and interface cards that are participating in network clocking, and then selecting a port to act as the source of timing for the network clock.

The network clock provides timing from the source through the port to the AIM, and then out to all participating router slots. Cisco 2600 series routers support one internal AIM slot, and Cisco 3660 routers support two internal AIM slots. An AIM slot connects to both the main system bus and a secondary time-division multiplexing (TDM) bus running between network module slots and, on the Cisco 2600 series, to WAN interface card (WIC) slots.

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Note The clock configuration commands discussed in this section apply to ATM trunks as well as to digital voice trunks.

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Three commands configure network clocking: network-clock-participate, network-clock-select, and clock source (digital ports only).

The network-clock-participate command configures the specified router slot to take its clock from the network clock; that is, this command identifies the slots that get their timing from the AIM.

The network-clock-select command configures a port in one of the participating slots to be a source for the network clock, and assigns it a priority level. This command is repeated for each port that you want to act as a primary or backup source for the network clock. The highest priority level indicates the port that you want to be the primary source of timing for the network clock. If the highest-priority port becomes unavailable, the second-highest priority level takes over automatically as the network clock, and so forth for the lower-priority levels. The clocking is provided to the AIM, which then provides it to participating slots in the router.

The network clock source must be derived from an external source, from either PSTN or PBX clocks over trunk lines. For digital voice ports, the clock source command in controller configuration mode configures the type of timing (internal or from the line) for each port that you designate as a primary source or backup for the network clock. This step does not apply to analog voice ports.

These commands allow maximum flexibility. For example, on a router with a multiflex trunk VWIC connected to an ATM network and a digital T1/E1 packet voice trunk network module connected to a PBX, you could set up network clocking in any of three ways:

•The multiflex trunk VWIC provides clocking to the AIM, which provides it to the digital T1/E1 packet voice trunk network module (that is, to the PBX).

•The digital T1/E1 packet voice trunk network module provides clocking to the AIM, which provides it to the multiflex trunk VWIC (that is, to the ATM network).

•The ATM network and the PBX run their own clocks, which are not necessarily synchronized. However, this scenario could result in poor voice quality.

For a detailed discussion of clock sources on individual ports, see "Clock Sources on Digital T1/E1 Voice Ports" in the "Configuring Voice Ports" chapter in the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2.

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Note For analog ports using an AIM-ATM to process voice for ATM and AAL5, configure the network clock commands to select the controller port that is being used as the ATM trunk interface, so that the AIM-ATM is synchronized with the ATM network.

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To configure network clock timing and priority for ATM and digital voice ports, complete these steps, beginning in global configuration mode:

	Command	Purpose
Step 1	Router(config)# controller {t1 | e1} slot/port	Enters controller configuration mode. The keywords and arguments are as follows: •t1 | e1—The type of controller. •slot/port—The backplane slot number and port number for the interface being configured.
Step 2	Router(config-controller)# clock source {line [primary]| internal}	Specifies the source from which the PLL on this port derives its clocking, and if the source is from the line, whether this port is the primary source. The default is line. Note If you accept the default, the clock source configuration does not appear in the show running-config command output. Use the show controller command to display the current clock source for a port.
Step 3	Router(config-controller)# exit	Exits controller configuration mode.
Step 4	Router(config)# network-clock-participate [nm slot | wic wic]	Allows the network module or VWIC in the specified slot to use the network clock for its timing.
Step 5	Router(config)# network-clock-select priority {t1 | e1} slot/port	Specifies a port to be used as a timing source for the network clock, and the priority level for the use of that port. The source that is given the highest priority is used first; if it becomes unavailable, the source with the second-highest priority is used, and so forth.

Configuring AIM for ATM WAN Access

For each controller that uses the ATM functionality of AIM-ATM or AIM-ATM-VOICE-30, the following must be configured:

•The AIM resources to be used—The mode atm command specifies the AIM to use for this controller.

•Voice over ATM, Voice over IP, or Voice over Frame Relay—See the appropriate document from the "Related Documents" section.

To configure a controller to use an AIM for ATM processing for Voice over ATM, complete these steps, starting in global configuration mode:

	Command	Purpose
Step 1	Router(config)# controller {t1 | e1} slot/port	Enters controller configuration mode. The keywords and arguments are as follows: •t1 | e1—The type of controller. •slot/port—The backplane slot number and port number for the interface being configured.
Step 2	Router(config-controller)# mode atm [aim aim-slot]	Specifies that the configuration on this controller is for ATM, using the AIM in the specified slot for ATM processing, and creates ATM interface 0. aim-slot is the AIM slot number on the router chassis: •Cisco 2600 series—0 •Cisco 3660—0 or 1 Note The mode atm command without the aim keyword uses software to perform ATM segmentation and reassembly (SAR) rather than the AIM. This is supported on Cisco 2600 series WIC slots only, and is not supported on network module slots.
Step 3	Router(config-controller)# exit	Exits controller configuration mode.

Configuring AIM for ATM WAN Access with IMA

Inverse multiplexing over ATM allows you to aggregate multiple low-speed links into one larger virtual trunk, or IMA group, which appears to your ATM switch as one logical pipe. Configuration of IMA groups is described in the "Configuring Inverse Multiplexing over ATM" section of the "Configuring ATM" chapter of the Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2.

When IMA is being configured on Cisco 2600 series and Cisco 3600 routers that use AIMs for ATM processing, the argument for atm slot in the interface command is different than when configuring ATM without an AIM. When using an AIM, the ATM slot number is always 0, because the ATM resources are on the AIM in the motherboard rather than on a network module. All other ATM IMA commands are the same as those described in the "Configuring ATM" chapter of the Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2.

To configure the interface command for ATM IMA using an AIM-ATM or AIM-ATM-VOICE-30, complete this step, beginning in global configuration mode:

	Command	Purpose
Step 1	Router(config)# interface atmslot/imagroup-number	Enters interface configuration mode and specifies the slot location of the interface and IMA group number. Note atm slot is always 0 when configuring IMA and using an AIM for ATM processing on Cisco 2600 series and Cisco 3660 routers. There are no changes to other ATM interface commands.
Step 2	Router(config)#	Continue with the IMA configuration described in the "Configuring Inverse Multiplexing over ATM" section of the "Configuring ATM" chapter of the Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2.
Step 3	Router(config-if)# exit	Exits interface configuration mode.

Configuring AIM for VoIP, VoATM, or VoFR

For each controller that uses the DSP functionality of the AIM-VOICE-30 or AIM-ATM-VOICE-30, the following must be configured:

•The AIM DSP resources to be used—The dspfarm command in voice-card configuration mode assigns resources.

•The controller mode to be used (only for Cisco 2600 series using WIC slots)—The mode cas command specifies that channel-associated signaling is used for this controller.

•Voice over ATM, Voice over IP, or Voice over Frame Relay—See the appropriate document from the "Related Documents" section.

Digital Signal Processors (DSPs) contain specialized electronics to handle the complex computational processing needed for VoIP, such as compression, coding, and decoding. The number of DSP resources required on a router depends on the codec complexity and number of time slots you are using.

Previously, DSP resources required for voice processing had to be present on the same network module with the voice port. The dspfarm command now allows the DSP resources on an AIM-VOICE-30 or AIM-ATM-VOICE-30 to be mapped to a T1 or E1 connection housed in a network module or Cisco 2600 series WIC slot with no local DSPs.

Configure the use of AIM DSP resources by completing these steps, beginning in global configuration mode:

	Command	Purpose
Step 4	Router(config)# voice-card slot	Enters voice-card configuration mode to configure DSP resources on the specified card. slot is the AIM slot number on the router chassis: •Cisco 2600 series—0 •Cisco 3660—7 is AIM slot 0, and 8 is AIM slot 1
Step 5	Router(config-voicecard)# dspfarm	(Optional) Enters the DSP resources on the AIM specified in the voice-card command into the DSP resource pool.
Step 6	Router(config-voicecard)# exit	Exits voice-card configuration mode.
Step 7	Router(config)# controller {t1 | e1} slot/port	Enters controller configuration mode. The keywords and arguments are as follows: •t1 | e1—The type of controller. •slot/port—The backplane slot number and port number for the interface being configured.
Step 8	Router(config-controller)# mode cas	(Required only for Cisco 2600 series routers when configuring the ds0-group command and using WIC slots; not used on the Cisco 3660 or on Cisco 2600 series routers using network modules.) Specifies CAS mode.
Step 9	Router(config-controller)# ds0-group ds0-group-no timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start} or Router(config-controller)# pri-group timeslots timeslot-list	Defines the T1 or E1 channels for use by compressed voice calls and the signaling method that the router uses to connect to the private branch exchange (PBX) or central office (CO). or Specifies an ISDN Primary Rate Interface (PRI) on a channelized T1 or E1 controller. Note When configuring PRI groups, you must also configure the isdn switch-type command. Also, only one PRI group can be configured on a controller.
Step 10	Router(config-controller)# exit	Exits controller configuration mode.

Verifying AIM Configuration

Use the following commands to verify your software configuration:

---

Step 1 Display the running configuration:

Router# show running-config

Step 2 Display controller information to verify the clock source configuration:

Router# show controller {t1 | e1} slot/port

Step 3 Display the current chosen clock and the list of all sources of network clocks according to their priority:

Router# show network-clocks 

  Network Clock Configuration 

  --------------------------- 

  Priority      Clock Source    Clock State     Clock Type 

    3             E1 6/2             GOOD               E1

    5             T1 2/0             GOOD               T1  

    9          Backplane             Good               PLL 

  Current Primary Clock Source 

  --------------------------- 

  Priority      Clock Source    Clock State     Clock Type 

    3             E1 6/2             GOOD                E1 

---

Troubleshooting Tips

The following commands verify hardware in the router:

•show version—Lists the modules installed in the router. If AIMs are installed, the output displays one of the following:

1 ATM AIM(s)—If one AIM is installed in the router

2 ATM AIM(s)—If two AIMs are installed in the router

•show pci aim—(Cisco 2600 series only) Lists AIMs installed in Cisco 2600 series routers.

The following example shows one AIM-ATM in a Cisco 2600 series router:

Router# show pci aim

AIM Slot 0:ID 0x01B0

   Hardware Revision        :1.0

   Top Assy. Part Number    :800-03700-01

   Board Revision           :A0

   Deviation Number         :0-0

   Fab Version              :02

   PCB Serial Number        :JAB9801ABCD

   RMA Test History         :00

   RMA Number               :0-0-0-0

   RMA History              :00

   EEPROM format version 4

   EEPROM contents (hex):

     0x00:04 FF 40 01 B0 41 01 00 C0 46 03 20 00 0E 74 01

     0x10:42 41 30 80 00 00 00 00 02 02 C1 8B 4A 41 42 39

     0x20:38 30 31 41 42 43 44 03 00 81 00 00 00 00 04 00

     0x30:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

     0x40:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

     0x50:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

     0x60:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

     0x70:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

•show diag—Lists the onboard port adapters in the system board (slot 0 of the router). (AIM slots are in the system board.) The AIM information is at the end of the list. The following example shows one AIM-ATM in a Cisco 2600 series router:

Router# show diag 0

             Slot 0:

             C2621 2FE Mainboard Port adapter, 4 ports

             Port adapter is analyzed 

             Port adapter insertion time unknown

             EEPROM contents at hardware discovery:

             Hardware Revision        : 1.0

             PCB Serial Number        : JAB030805D4 (1437466844)

             Part Number              : 73-3200-03

             RMA History              : 00

             RMA Number               : 0-0-0-0

             Board Revision           : A0

             Deviation Number         : 0-0

             EEPROM format version 4

             EEPROM contents (hex):

               0x00: 04 FF 40 00 A2 41 01 00 C1 18 4A 41 42 30 33 30

               0x10: 38 30 35 44 34 20 28 31 34 33 37 34 36 36 38 34

               0x20: 34 29 82 49 0C 80 03 04 00 81 00 00 00 00 42 41

               0x30: 30 80 00 00 00 00 FF FF FF FF FF FF FF FF FF FF

               0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

     WIC Slot 0:

             T1 (2 port) WAN daughter card

             Hardware revision  1.0          Board revision B0

             Serial number      18050118     Part number    800-04477-01

             Test history       0x0          RMA number     00-00-00

             Connector type     PCI

             EEPROM format version 1

             EEPROM contents (hex):

               0x20: 01 22 01 00 01 13 6C 46 50 11 7D 01 00 00 00 00

               0x30: 58 00 00 00 00 02 21 00 FF FF FF FF FF FF FF FF

     WIC Slot 1:

             E1 Drop&Insert (2 port) WAN daughter card

             Hardware revision 1.0           Board revision B0

             Serial number     24234788      Part number    800-04615-02

             Test history      0x0           RMA number     00-00-00

             Connector type    PCI

             EEPROM format version 1

             EEPROM contents (hex):

               0x20: 01 25 01 00 01 71 CB 24 50 12 07 02 00 00 00 00

               0x30: 58 00 00 00 00 12 19 00 FF FF FF FF FF FF FF FF

     ATM AIM 

             ATM AIM module with SAR only (no DSPs)

             Hardware Revision        :1.0

             Top Assy. Part Number    :800-03700-01

             Board Revision           :A0

             Deviation Number         :0-0

             Fab Version              :02

             PCB Serial Number        :JAB9801ABCD

             RMA Test History         :00

             RMA Number               :0-0-0-0

             RMA History              :00

             EEPROM format version 4

             EEPROM contents (hex):

               0x00:04 FF 40 01 B0 41 01 00 C0 46 03 20 00 0E 74 01

               0x10:42 41 30 80 00 00 00 00 02 02 C1 8B 4A 41 42 39

               0x20:38 30 31 41 42 43 44 03 00 81 00 00 00 00 04 00

               0x30:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x40:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x50:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x60:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

               0x70:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

The following example shows one AIM-ATM in a Cisco 3660 router:

Router# show diag 0

3660 Chassis type: ENTERPRISE

c3600 Backplane EEPROM:

.

.

.

Backplane TDM Switch :

    Hardware Revision        : 1.0

    Top Assy. Part Number    : 800-03700-01

    Board Revision           : A0

    Deviation Number         : 0-0

    Fab Version              : 02

    PCB Serial Number        : JAB9801ABCD

    RMA Test History         : 00

    RMA Number               : 0-0-0-0

    RMA History              : 00

    EEPROM format version 4

    EEPROM contents (hex):

      0x00: 04 FF 40 01 E1 41 01 00 C0 46 03 20 00 0E 74 01

      0x10: 42 41 30 80 00 00 00 00 02 02 C1 8B 4A 41 42 39

      0x20: 38 30 31 41 42 43 44 03 00 81 00 00 00 00 04 00

      0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

Slot 0:

    C3600 Mother board 2FE(TX) Port adapter, 2 ports

    .

    .

    .      

ATM AIM: 1

    ATM AIM module with SAR only (no DSPs)

    Hardware Revision        : 1.0

    Top Assy. Part Number    : 800-03700-01

    Board Revision           : A0

    Deviation Number         : 0-0

    Fab Version              : 02

    PCB Serial Number        : JAB9801ABCD

    RMA Test History         : 00

    RMA Number               : 0-0-0-0

    RMA History              : 00

    EEPROM format version 4

    EEPROM contents (hex):

      0x00: 04 FF 40 01 B0 41 01 00 C0 46 03 20 00 0E 74 01

      0x10: 42 41 30 80 00 00 00 00 02 02 C1 8B 4A 41 42 39

      0x20: 38 30 31 41 42 43 44 03 00 81 00 00 00 00 04 00

      0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

      0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

      0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

      0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

      0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

Configuration Examples

This section provides the following configuration examples:

•ATM AIM for ATM with IMA Configuration Example

•AIM DSP for VoIP Configuration Example

---

Note IP addresses and host names in these examples are fictitious.

---

ATM AIM for ATM with IMA Configuration Example

This example shows a configuration for ATM with IMA on a Cisco 2610 router. The network clock is provided to the AIM by the line connected to port E1 0/0. The second priority source for the network clock is the line connected to port E1 0/1. The designation of line for the clock source command does not appear in this show running-config output, because line is the default for that command. This information appears in the show controller command output instead.

!

version 12.2

no service single-slot-reload-enable

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname 2610

!

no logging buffered

no logging buffered

logging rate-limit console 10 except errors

!

!

network-clock-participate aim 0

network-clock-participate wic 0

network-clock-select 1 E1 0/0

network-clock-select 2 E1 0/1

!

voice-card 0

 dspfarm

!

ip subnet-zero

!

!

no ip finger

ip host adams1 192.168.254.254

!

!

!

!

!

!

controller E1 0/0

 mode atm aim 0

!

controller E1 0/1

 mode atm aim 0

!

!

!

interface ATM0/0

 ip address 10.0.0.1 255.0.0.0

 scrambling-payload

 ima-group 1

 no atm ilmi-keepalive

!

!

!

interface Ethernet0/0

 ip address 10.8.10.10 255.255.255.0

 half-duplex

!

interface ATM0/1

 ip address 10.0.1.1 255.0.0.0

 scrambling-payload

 ima-group 1

 no atm ilmi-keepalive

!

!

interface ATM0/IMA1

 ip address 172.20.0.1 255.0.0.0

 no atm ilmi-keepalive

 pvc 1/100

  protocol ip 172.20.0.2 broadcast

 !

!

ip classless

ip route 192.168.254.254 255.255.255.255 Ethernet0/0

no ip http server

!

!

!

snmp-server packetsize 4096

call rsvp-sync

!

mgcp modem passthrough voip mode ca

no mgcp timer receive-rtcp

!

mgcp profile default

!

dial-peer cor custom

!

!

!

!

line con 0

 transport input none

line aux 0

line vty 0 4

 login

!

end

AIM DSP for VoIP Configuration Example

The following example uses the DSP capabilities of the AIM-VOICE-30 to process voice and then take the voice out over the Ethernet connection on a Cisco 2600 series gateway.

!

!

version 12.2

no service single-slot-reload-enable

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname 2600b

!

no logging buffered

no logging buffered

logging rate-limit console 10 except errors

!

!

!

!

memory-size iomem 30

network-clock-participate wic 0 

network-clock-select 2 E1 0/1

voice-card 0

 dspfarm

!

ip subnet-zero

!

!

no ip finger

ip host monroe 192.168.254.254

!

isdn switch-type primary-qsig

!

!

!

!

!

controller E1 0/0

 clock source internal

 pri-group timeslots 1-31

!

controller E1 0/1

 mode atm aim 0

!

controller T1 1/0

!

controller T1 1/1

!

!

!

interface Loopback0

 ip address 10.0.0.1 255.0.0.0

 no ip mroute-cache

!

interface Ethernet0/0

 ip address 10.8.10.26 255.255.255.0

 half-duplex

!

interface Serial0/0:15

 no ip address

 ip mtu 0

 no logging event link-status

 isdn switch-type primary-qsig

 isdn incoming-voice voice

 no cdp enable

!

interface ATM0/1

 ip address 10.0.0.1 255.255.255.0

 scrambling-payload

 no atm ilmi-keepalive

 pvc 10/10 

  protocol ip 10.0.0.2 broadcast

 !

!

interface Ethernet0/1

 ip address 172.24.63.26 255.255.255.0

 half-duplex

!

ip classless

ip route 10.3.26.0 255.255.255.0 1.4.0.1

ip route 10.3.26.0 255.255.255.0 1.5.0.1

ip route 192.168.0.0 255.255.0.0 1.4.0.1

ip route 192.168.254.0 255.255.255.0 Ethernet0/0

no ip http server

!

!

!

snmp-server engineID local 0000000902000001429F4180

snmp-server packetsize 4096

call rsvp-sync

!

voice-port 0/0:15

!

mgcp modem passthrough voip mode ca

no mgcp timer receive-rtcp

!

mgcp profile default

!

dial-peer cor custom

!

!

!

dial-peer voice 150 voip

 destination-pattern 3......

 session target ipv4:172.24.63.2

 codec g711alaw

!

dial-peer voice 20 pots

 destination-pattern 2......

 direct-inward-dial

 port 0/0:15

 forward-digits all

!

!

line con 0

 transport input none

line aux 0

line vty 0 4

 login

!

end

Command Reference

This section documents modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.2 command reference publications.

•clock source (T1/E1 Controller)

•dspfarm (voice-card)

•mode (T1/E1 Controller)

•network-clock-participate

•network-clock-select

•voice-card

clock source (T1/E1 Controller)

To set clocking for individual T1 or E1 links, use the clock source command in controller configuration mode. To return to the default, use the no form of this command.

clock source {line [primary] | internal | free-running}

no clock source

Syntax Description

line	Specifies that the phase-locked loop (PLL) on this port derives its clocking from the external source to which the port is connected, which is generally the telephone company central office (CO).
primary	Specifies that the PLL on this port derives its clocking from the external source to which the port is connected. This option also puts a second port, which is generally connected to the private branch exchange (PBX), into looped-time mode. Both ports are configured with line, but only the port connected to the external source is configured with primary.
internal	Specifies that the clock is generated from the T1 or E1 controller's internal PLL.
free-running	Specifies a free-running clock derived from the oscillator on the motherboard, which is used only for testing and back-to-back connections.

Defaults

The default is line.

Command Modes

Controller configuration

Command History

Release	Modification
12.2(2)XB	This command is supported in controller configuration mode for Cisco 2600 series and Cisco 3660 routers.

Usage Guidelines

For a detailed discussion of clock sources on individual ports, see "Clock Sources on Digital T1/E1 Voice Ports" in the "Configuring Voice Ports" chapter in the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2.

Examples

The following example shows the router providing clock source to two controllers:

controller E1 1/0

 framing crc4

 linecoding hdb3

 clock source internal

 ds0-group timeslots 1-15 type e&m-wink-start

!

controller E1 1/1

 framing esf

 linecoding b8zs

 clock source internal

 ds0-group timeslots 1-15 type e&m-wink-start

The following example shows the digital voice hardware receiving clocking for the PLL from E1 1/0, and using this clock as a reference to clock E1 1/1. If controller E1 1/0 fails, the PLL internally generates the clock reference to drive E1 1/1.

controller E1 1/0

 framing crc4

 linecoding hdb3

 clock source line 

 ds0-group timeslots 1-15 type e&m-wink-start

!

controller E1 1/1

 framing crc4

 linecoding hdb3

 clock source internal

 ds0-group timeslots 1-15 type e&m-wink-start

Related Commands

Command	Description
controller	Configures a T1 or E1 controller and enters controller configuration mode.

dspfarm (voice-card)

To allow the specified voice card to participate in Digital Signal Processor (DSP) resource mapping, use the dspfarm command in voice-card configuration mode. To remove the specified card from participation in the DSP resource map, use the no form of this command.

dspfarm

no dspfarm

Syntax Description

This command has no arguments or keywords.

Defaults

The default behavior is that a card participates in the DSP resource pool.

Command Modes

Voice-card configuration

Command History

Release	Modification
12.1(5)XM	This command was introduced for the Cisco 3660.
12.2(2)XB	Support was added for Cisco 2600 series routers.

Usage Guidelines

DSP mapping occurs when DSP resources on one AIM or network module are available for processing of voice time-division multiplexing (TDM) streams on a different network module or on a voice/WAN interface card (VWIC). This command is used on Cisco 3660 routers with a multiservice interchange (MIX) module installed or on Cisco 2600 series routers with AIMs installed.

To reach voice-card configuration mode for a particular voice card, from global configuration mode enter the voice-card command and the slot number for the AIM or network module that you want to add to the pool. See the voice-card command reference for details on slot numbering.

The assignment of DSP pool resources to particular TDM streams is based on the order in which the streams are configured with the ds0-group command for T1/E1 channel-associated signaling (CAS) or the pri-group command for ISDN Primary Rate Interface (PRI). The assignment of DSP pool resources does not occur dynamically during call signaling.

Examples

The following example adds the DSP resources on the network module in slot 5 on a Cisco 3660 with a MIX module to the DSP resource map:

voice-card 5

 dspfarm

The following example makes available the DSP resources on an AIM on a Cisco 2600 series router:

voice-card 0

 dspfarm

Related Commands

Command	Description
voice-card	Enters voice-card configuration mode.

mode (T1/E1 Controller)

To set the T1 or E1 controller into ATM mode and create an ATM interface (ATM 0) or to set the T1 or E1 controller into channel-associated signaling (CAS) mode, use the mode command in controller configuration mode. To disable the controller mode, use the no form of this command.

mode {atm [aim aim-slot] | cas}

no mode {atm [aim aim-slot] | cas}

Syntax Description

atm	Sets the controller into ATM mode and creates an ATM interface (ATM 0). When ATM mode is enabled, no channel groups, DS0 groups, PRI groups, or TDM groups are allowed, because ATM occupies all the DS0s on the T1/E1 trunk. When you set the controller to ATM mode, the controller framing is automatically set to ESF for T1 or CRC4 for E1. The linecode is automatically set to B8ZS for T1 or HDBC for E1. When you remove ATM mode by entering the no mode atm command, ATM interface 0 is deleted. On the Cisco MC3810, ATM mode is supported only on controller 0 (T1 or E1 0). Note The mode atm command without the aim keyword uses software to perform ATM segmentation and reassembly (SAR). This is supported on Cisco 2600 series WIC slots only, and is not supported on network module slots.
aim	Specifies that the configuration on this controller uses the Advanced Integration Module (AIM) in the specified slot for ATM SAR. The aim keyword does not apply to the Cisco MC3810.
aim-slot	AIM slot number on the router chassis: •Cisco 2600 series—0. •Cisco 3660—0 or 1.
cas	(Cisco 2600 series WIC slots only) Specifies that the T1 or E1 in this WIC slot is mapped to AIM DSPs to support T1 or E1 voice (that is, it is configured in a DS0 group or a PRI group).

Defaults

No default behavior or values.

Command Modes

Controller configuration

Command History

Release	Modification
11.3 MA	This command was introduced on the Cisco MC3810.
12.1(5)XM	Support for this command was extended to the merged SGCP/MGCP software.
12.2(2)T	This command was integrated into Cisco IOS Release 12.2(2)T.
12.2(2)XB	Support was extended to the Cisco 2600 series and Cisco 3660. The keyword aim and the argument aim-slot were added. The parenthetical modifier for the command was changed from "Voice over ATM" to "T1/E1 Controller."

Usage Guidelines

This command has these platform-specific usage guidelines:

•Cisco 2600 series and Cisco 3660 routers that use an AIM for ATM processing must use the mode atm aim aim-slot command.

•Cisco 2600 series routers that use an AIM for DSP processing and specify DS0 groups must use the mode cas command if they are using WIC slots for voice. This command does not apply if network modules are being used.

•Cisco 3660 routers that use an AIM only for DSP resources should not use this command.

•On Cisco 2600 series routers that use WIC slots for voice, the mode atm command without the aim keyword specifies software ATM segmentation and reassembly. When the aim keyword is used with the mode atm command, the AIM performs ATM segmentation and reassembly.

•Cisco MC3810 routers cannot use the aim keyword.

•Cisco MC3810 routers with digital voice modules (DVM) use some DS0s exclusively for different signaling modes. The DS0 channels have the following limitations when mixing different applications (such as voice and data) on the same network trunk:

–On E1 controllers, DS0 16 is used exclusively for either CAS or CCS, depending on which mode is configured.

–On T1 controllers, DS0 24 is used exclusively for CCS.

•Cisco MC3810—When no mode is selected, channel groups and clear channels (data mode) can be created using the channel group and tdm-group commands, respectively.

Examples

The following example configures ATM mode on controller T1 0. This step is required for Voice over ATM.

controller T1 0

 mode atm

The following example configures ATM mode on controller T1 1/ 0 on a Cisco 2600 series router, using an AIM in slot 0 for ATM segmentation and reassembly:

controller T1 1/0

 mode atm aim 0

The following example configures CAS mode on controller T1 1 on a Cisco MC3810:

controller T1 1

 mode cas

Related Commands

Command	Description
channel-group	Defines the time slots of each T1 or E1 circuit.
ds0-group	Defines T1/E1 channels for compressed voice calls and the CAS method by which the router connects to the private branch exchange (PBX) or public switched telephone network (PSTN).
tdm-group	Configures a list of time slots for creating clear channel groups (pass-through) for time-division multiplexing (TDM) cross-connect.

network-clock-participate

To allow the ports on the specified network module or voice/WAN interface card (VWIC) to use the network clock for timing, use the network-clock-participate command in global configuration mode. To restrict the network module or VWIC to use only its own clock signals, use the no form of this command.

network-clock-participate [nm slot | wic wic-slot]

no network-clock-participate [nm slot | wic wic-slot]

Syntax Description

nm slot	Network module slot number on the router chassis. •Cisco 2600 series—1. •Cisco 3660—1 to 6.
wic wic-slot	(Cisco 2600 series only) WAN interface card (WIC) slot number on the router chassis. Valid values are 0 and 1.

Defaults

No network clocking is enabled; interfaces are restricted to the clocking generated on their own modules.

Command Modes

Global configuration

Command History

Release	Modification
12.1(5)XM	This command was introduced for the Cisco 3660.
12.2(2)XB	Support was added for the Cisco 2600 series, the keyword slot was replaced by nm, and the keyword wic and the argument wic-slot were added.

Usage Guidelines

This command is used on Cisco 3660 routers with a multiservice interchange (MIX) module installed, and on Cisco 2600 series routers with an Advanced Integration Module (AIM) for ATM segmentation and reassembly or digital signal processing.

This command applies to any network module with T1/E1 controllers to provide clocks from a central source (AIM for the Cisco 2600 or MIX module for the Cisco 3660) to the network module and to the port on the network module. Then that port can be selected as the clock source with the network-clock-source command to supply clock to other ports or network modules that choose to participate in network clocking with the network-clock-participate command. This synchronizes the clocks for two ports.

---

Note If the AIM takes its clock signals from a T1 or E1 controller, it is mandatory to use the network-clock-select and network-clock-participate commands for ATM. The clocks for the ATM and voice interfaces do not need to be synchronous, but improved voice quality may result if they are.

---

---

Note The only VWICs that can participate in network clocking are those found in Cisco 2600 series WIC slots, digital T1/E1 packet voice trunk network modules (NM-HDV), or Fast Ethernet network modules (NM-2W, NM-1FE. or NM-2FE).

---

Examples

The following example shows how to add the network module in slot 5 to network clock participation on a Cisco 3660 with a MIX module:

Router(config)# network-clock-participate nm 5

The following example on a Cisco 2600 series router specifies that the AIM participates in network clocking and selects the E1 port 0/1 to provide the clock signals.

Router(config)# network-clock-participate wic 0 

Router(config)# network-clock-select 2 E1 0/1

Related Commands

Command	Description
network-clock-select	Configures the network clock source and priorities for providing timing to the system backplane time-division multiplexing (TDM) bus.

network-clock-select

To name a source that provides timing for the network clock and to specify the selection priority for this clock source, use the network-clock-select command in global configuration mode. To cancel the network clock selection, use the no form of this command.

Cisco 2600 series or Cisco 3660

network-clock-select priority {t1 | e1} slot /port

no network-clock-select priority {t1 | e1} slot/port

Cisco MC3810

network-clock-select priority {serial 0 | system | controller}

no network-clock-select priority {serial 0 | system | controller}

Syntax Description

priority	Selection priority for the clock source (1 is highest priority). The clock with highest priority will be selected to drive the system TDM clocks. When the higher priority clock source fails, the next higher priority clock source is selected. Values are: •Cisco 2600 series—1 to 4. •Cisco 3660—1 to 8. •Cisco MC3810—1 to 4.
t1	(Cisco 2600 series or Cisco 3660) Port type is T1.
e1	(Cisco 2600 series or Cisco 3660) Port type is E1.
slot	(Cisco 2600 series or Cisco 3660) Slot number identifying the controller that is the clock source. •Cisco 2600 series—0 (built-in WIC slot) or 1 (network module slot). •Cisco 3660—1 to 6.
port	(Cisco 2600 series or Cisco 3660) Port number identifying the controller that is the clock source. The range is from 0 to 3.
serial 0	(Cisco MC3810) (Optional) Specifies serial interface 0 as the clock source.
system	(Cisco MC3810) (Optional) Specifies the system clock as the clock source.
controller	(Cisco MC3810) (Optional) Specifies which controller is the clock source. You can specify either the trunk controller (T1/E1 0) or the digital voice module (T1/E1 1).

Defaults

Cisco 2600 series

The network clock source is the Advanced Integration Module (AIM) phase-locked loop (PLL) with priority 5.

Cisco 3660

The network clock source is the backplane PLL with priority 9.

Cisco MC3810

No network clock source is specified.

Command Modes

Global configuration

Command History

Release	Modification
11.3 MA	This command was introduced for the Cisco MC3810.
12.1(5)XM	Support was added for the Cisco 3660, and the keywords t1 and e1 were introduced.
12.2(2)XB	Support was added for Cisco 2600 series and Cisco 3660 routers with Advanced Integration Modules (AIMs) installed.

Usage Guidelines

Cisco 2600 series and Cisco 3660

This command is used on Cisco 2600 series and Cisco 3660 routers with Advanced Integration Modules (AIMs) or Cisco 3660 routers with Multiservice Interchange (MIX) Modules. It names a controller to provide clocking signals to the backplane, which then provides them to all the network modules that are participating in network clocking.

Cisco MC3810

This command applies to Voice over Frame Relay, Voice over ATM, and Voice over HDLC on the Cisco MC3810.

Examples

Cisco 2600 series and Cisco 3660

This example selects the controller in slot 5, port 1, to provide the clock at priority 3:

Router(config)# network-clock-select 3 t1 5/1

Cisco MC3810

The following example sets the priority of four network clock sources. When the clock source with the highest priority (controller T1 0) fails, the Cisco MC3810 switches the clock source to the second highest priority (controller T1 1).

Router(config)# network-clock-select 1 T1 0

Router(config)# network-clock-select 2 T1 1

Router(config)# network-clock-select 3 serial 0

Router(config)# network-clock-select 4 System

Related Commands

Command	Description
network-clock-participate	(Cisco 2600 series and Cisco 3660) Configures a network module to participate in network clocking.
network-clock-switch	(Cisco MC3810) Configures the switch delay time to the next priority network clock source when the current network clock source fails.

voice-card

To enter voice-card configuration mode to configure a card with voice processing resources, enter the voice-card command in global configuration mode.

voice-card slot

Syntax Description

slot

Slot number for the card to be configured. •Cisco 2600 series—0 is the Advanced Integration Module (AIM) slot in the router chassis, and 1 is the network module slot in the router chassis. •Cisco 3600 series—1 to 6 identifies a network module slot in the router chassis. •Cisco 3660—7 is AIM slot 0 in the router chassis, and 8 is AIM slot 1. •Cisco MC3810 concentrators with one or two high-performance voice compression modules (HCMs) installed—0 applies to the entire chassis.

Defaults

This command has no defaults.

Command Modes

Global configuration

Command History

Release	Modification
12.0(5)XK	The command was introduced for the Cisco 2600 series and Cisco 3600 series.
12.0(7)T	This command was integrated into Cisco IOS Release 12.0(7)T.
12.0(7)XK	This command was first supported on the Cisco MC3810 series.
12.1(2)T	This command was integrated into Cisco IOS Release 12.1(2)T.
12.2(2)XB	Values for slot were updated to include AIMs.

Usage Guidelines

Voice card configuration mode is used for commands that configure the use of digital signal processing (DSP) resources, such as codec complexity and Digital Signal Processors (DSP). DSP resources can be found in digital T1/E1 packet voice trunk network modules on Cisco 2600 series and Cisco 3600 series routers, and on high-performance compression modules on Cisco MC3810 multiservice access concentrators. DSP resources are also found on some advanced integration modules (AIM-VOICE-30 and AIM-ATM-VOICE-30) on Cisco 2600 series and Cisco 3660 routers.

Codec complexity is configured in voice-card configuration mode. On the Cisco 2600 series and Cisco 3600 series, the slot argument corresponds to the physical chassis slot of the network module with DSP resources to be configured. On the Cisco MC3810 series, the slot argument is always 0, and the changes that are made in voice-card mode apply to the entire Cisco MC3810. On the Cisco MC3810 series, the voice-card command is available only if the chassis is equipped with one or two HCMs.

DSP resource sharing is also configured in voice-card configuration mode. On Cisco 2600 series and Cisco 3660 routers under specific circumstances, configuration of the dspfarm command enters DSP resources on a network module or AIM into a DSP resource pool. Those DSP resources are then available to process voice traffic on a different network module or voice/WAN interface card (VWIC). See dspfarm (voice-card) for more information about DSP resource sharing.

Examples

The following example enters voice-card configuration mode to configure resources on the network module in slot 1 on a Cisco 2600 series or Cisco 3600 series router:

Router(config)# voice-card 1

Router(config-voicecard)#

The following example enters voice-card configuration mode on a Cisco MC3810 concentrator:

Router(config)# voice-card 0

Router(config-voicecard)#

Glossary

AAL—ATM adaptation layer. Service-dependent sublayer of the data link layer. The AAL accepts data from different applications and presents it to the ATM layer in the form of 48-byte ATM payload segments. AALs consist of two sublayers: the convergence sublayer (CS) and the segmentation and reassembly sublayer (SAR). AALs differ on the basis of the source-destination timing used, whether they use constant bit rate (CBR) or variable bit rate (VBR), and whether they are used for connection-oriented or connectionless mode data transfer. At present, the four types of AAL recommended by the ITU-T are AAL1, AAL2, AAL3/4, and AAL5.

AAL2—ATM adaptation layer 2. One of four AALs recommended by the ITU-T. AAL2 is used for connection-oriented services that support a variable bit rate, such as some isochronous video and voice traffic.

AAL5—ATM adaptation layer 5. One of four AALs recommended by the ITU-T. AAL5 is used for connection-oriented services that support a variable bit rate, such as some isochronous video and voice traffic.

AIM—Advanced Integration Module. Hardware with components that provide specialized processing.

ATM—Asynchronous Transfer Mode. International standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media such as E3, SONET, and T3.

CAS—channel associated signaling. The transmission of signaling information within the voice channel. CAS signaling often is referred to as robbed-bit signaling because user bandwidth is being robbed by the network for other purposes.

DS0—digital service zero (0). Single timeslot on a DS1 (also known as T1) digital interface—that is, a 64-kbps, synchronous, full-duplex data channel, typically used for a single voice connection on a PBX. See also DS1 and PBX.

DSP—digital signal processor. A DSP segments the voice signal into frames and stores them in voice packets.

DSP resource pool—A collection of DSP resources available to a network module or VWIC on the router. These resources are found on another network module or on an AIM.

IMA—inverse multiplexing over ATM, a standard defined by the ATM Forum. IMA provides economical, high-bandwidth ATM WAN access by enabling multiple T1 or E1 ATM links to be combined and to appear as one physical link to higher layers.

MIX—multiservice interchange. Feature that allows TDM connections between MIX-enabled ports.

PBX—private branch exchange. Privately owned central switching office.

PDU—protocol data unit. Another name for packet.

PLL—phase-locked loop. An electronic circuit that synchronizes itself to an external reference signal. It locks itself onto the phase or onto the average frequency of the incoming signal, dynamically tracks it, and outputs a related but more useful version. Among the typical applications of a PLL in digital circuits are synchronizing a system to a single clock source and jitter filtering (removing phase noise).

PSTN—public switched telephone network. General term referring to the variety of telephone networks and services in place worldwide. Sometimes called POTS.

SAR—segmentation and reassembly. In ATM, the processes of dividing PDUs into 48-byte pieces of payload data at the source for transport, and then reassembling them into a stream at the destination.

VIC—voice interface card. Provides voice-specific ports, including foreign exchange station (FXS), foreign exchange office (FXO), ear and mouth (E&M), and basic rate interchange (BRI).

VWIC—A card that can operate as a VIC or as a WIC, providing physical connection to WAN or voice networks.

VoIP—Voice over IP. The ability to carry normal telephony-style voice over an IP-based Internet with circuit-based telephone-like functionality, reliability, and voice quality. VoIP is a blanket term that generally refers to the Cisco standards-based (H.323, and so forth) approach to IP voice traffic.

WIC—WAN (wide-area network) interface card.