Cisco 6000 Series IP DSL Switches

This document lists frequently asked questions about the Cisco 6260 Digital Subscriber Line Access Multiplexer (DSLAM).

1. In Cisco IOS® software version 12.2DA, the range is as follows:
   • For the route processor port (ATM Switch Processor (ASP)) interface, ATM0/0, the VPI is always 0. The VCI range is from 32 to 4095.
   • For DSL interfaces the VPI range is 0 to 255. The VCI range in manual-well-known-vc mode with the VPI equaling 0 is from 1 to 255. The VCI range in manual-well-known-vc mode with the VPI other than 0, is from 0 to 255. The VCI range not in manual-well-known-vc mode is from 32 to 255.
   • For other interfaces, the VPI range is from 0 to 255. The VCI range in manual-well-known-vc mode is from 5 to 16383. For VCI range not in manual-well-known-vc mode is from 32 to 16383.

     Note: The message not in manual-well-known-vc mode means soft Permanent Virtual Circuits (PVCs).

2. In Cisco IOS 12.1DA releases, the range for VPI and VCI is the same as in Cisco IOS release 12.2DA

A. For DSL ports in the profile configuration, issue the payload-scrambling command.

For ATM interfaces, issue the interface configuration mode command, as shown in the following example:

DSLAM(config)#interface {atm0/1|atm0/2} 
DSLAM(config-if)#scrambling [cell-payload | sts-stream] [protection | working | <cr>]

There is no default behavior for scrambling on an ATM interface if there are NI-2 cards. The following are optional arguments used with the scrambling command:

• cell-payload: Scrambling is enabled for the 48-byte portion of an ATM cell carrying user data.
• sts-stream: Scrambling is enabled for the portion of the Synchronous Transport Signal (STS) frame that carries user data (this keyword is available for OC-3 interfaces only).
• protection: Scrambling will be enabled for the fiber that is connected to the NI-2 card in slot 11.
• working: Scrambling will be enabled for the fiber that is connected to the NI-2 card in slot 10.

A. You need Cisco IOS® Software Release 12.0(8)DA3 or later.

• Permanent Virtual Circuits (PVCs) — The NI2 will support 16K, but the configuration will not fit in non-volatile RAM (NVRAM) so you have to save the configuration to flash.
• Switched Virtual Circuits (SVCs) — The NI2 will support 20K.
• Permanent Virtual Paths (PVPs) — 32 shaped VPs.

A. No. On the Cisco 6260 there is no command to lower the transmit power.

A. There is no limit except for non-volatile RAM (NVRAM), where configuration and memory are stored.

A. The no. of changes value is the number of state changes the port has made. For example, if a port retrains, it changes state from trained to no cpe detected to training and back to trained; the no. of changes increases by three. If you are not keeping track of log messages, the no. of changes value can be used to see if lines are bouncing.

Note: No command allows you to clear the number of changes field.

A. Each port can work on a different standard.

A. The NI-2 supports a maximum of five Telnet sessions and one console session.