BXM T3/E3 Broadband Switch Module [Cisco BPX 8600 Series Switches]

Data Sheet

BXM-T3/E3 Broadband Switch Module

The BXM-T3/E3 is a high-density ATM T3/E3 interface card that uses custom application-specific integrated circuit (ASIC) technology, for the BPX 8600 Series, to deliver the industry's most advanced and reliable ATM networking features. It Supports PVCs, SVCs, S-PVCs and MPLS LVCs (label VC) and provides card redundancy protection. Its high-speed connectivity takes ATM to new levels of efficiency and scalability.

The enhanced models of the BXM-T3/E3 also deliver the most advanced atm switching and traffic management capabilities in the industry. These models extend scalability by doubling the connection density and cell buffers on selected models as well as provide future support for vc merging for large MPLS-based IP+ATM networks.

Key Features

High-scalability connection densities with up to 144 T3/E3 ATM ports on a single Cisco BPX^® 8600 series wide-area switch
Complete network control through dynamic resource sharing and support for all ATM service classes
Industry's first fully compliant ATM Forum available bit rate (ABR) virtual source/virtual destination (VS/VD) capability in custom ASICs
New level of ATM price/performance to optimize the network life cycle
Support for VC merging with future software upgrade allows "label" sharing for different MPLS VCs with the same destination and class of service (enhanced -E and -EX models only)

With the increasing deployment of Asynchronous Transfer Mode (ATM) networks, there is a growing need for an ATM network platform that can deliver an unprecedented level of scalability, performance, and functionality at lower costs. Such an ATM switching platform must support high-speed interfaces with high port densities as well as advanced ATM traffic management capability.

Advanced ATM traffic management capabilities are implemented in a family of custom ASICs that enable high-density, high-speed ATM interface modules with advanced features and functionality for the BPX 8600 and IGX 8400 series wide-area switches.

This ASIC technology cost-effectively delivers the most advanced ATM switching and traffic management capability in the industry. It represents the first commercially available implementation of VS/VD.

The BXM-T3/E3 broadband switch module is a 8-, or 12- port, Digital Signal level 3 (DS-3) (45 or 34 Mbps) ATM interface card for the BPX switch platform. The interface can be configured for trunk, public, or private User-Network Interface (UNI) applications on a per-port basis to provide a high-density, low-cost broadband ATM networking solution.

Technical Specifications

Physical Layer

8-, or 12-port T3/E3 ports
Complies with ATM Forum UNI Specification Version 3.1, 4.0
1:1 BXM redundancy supported using `Y' redundancy

Interface Physical Characteristics:

Characteristic	T3 (DS3)	E3 (34 Mbps)
Line Rate	44.736 Mbps ± 20 ppm	34.368 Mbps ± 20 ppm
Line Code	B3ZS	HDB3
Cell transfer rate	96,000 cells/sec	80,000 cells/sec
Framing	ANSI T1.107, T1.107a	ITU-T G.804, G.832
Signal Level	TA-TSY-00077 (PLCP)	ITU-T G.703
Connector	Locking SMB	Locking SMB
Cell Mapping	Direct	Direct

Synchronization

Can be configured for internal timing from the BPX internal Stratum 3 clock conforming to ATT Pub. 62411
System clock synchronization to service module port option

ATM Layer

Configurable for trunk and public or private UNI application
UNI conformant to ATM Forum UNI Specification V.3.1, ITU-T I.361 and I.432 specifications
Support for ATM Forum ILMI 4.0
Complies with standard Usage Parameter Control (UPC) per ATM Forum UNI Specification V.3.1, TM 4.0 and ITU-T I.371
Supports virtual circuit connections (VCCs) and virtual path connections (VPCs) per ATM Forum UNI Specification V.3.1 and ITU-T I.371
Connections:
- 16,384 to 32,768 connections per card per UNI Specification 3.1
Virtual path identifier (VPI)/virtual channel identifier (VCI) range for VCCs and VPCs: per UNI Specification V.3.1
Support for VC merging with future software upgrade (enhanced -E and -EX models only)

Traffic Management

Per-VC queuing and scheduling
Per-VC traffic shaping
Per-VC weighted fair queuing (WFQ)
Up to 16 classes of service with the following configurable parameters:
- Separate cell discard threshold for CLP0 and CLP1 cells
- Separate early packet discard (EPD) threshold for CLP0 and CLP1 cells with future software upgrade (enhanced -E and -EX models only)
- Maximum Queue Depth (MQD) with partial packet discard (PPD)
- Service Priority Level (SPL)
- Explicit Forward Congestion Indication (EFCI) threshold

Constant Bit Rate Service

UPC per ATM Forum UNI Specification V.3.1, TM V.4.0 and ITU-T I.371
UPC: Ingress rate monitoring and discarding for:
- Peak Cell Rate (PCR)
- Cell Delay Variation Tolerance (CDVT)

Variable Bit Rate Service

UPC per ATM Forum UNI Specification V.3.1, TM V.4.0 and ITU-T I.371
UPC: Ingress rate monitoring and cell tagging for:
- PCR
- CDVT
- Sustainable Cell Rate (SCR)
- Maximum Burst Size (MBS)
CLP tagging, enabled, or disabled on a per-virtual circuit (VC) basis at the ingress side
Support for both VBR-rt and VBR-nrt
EPD

ABR Service and Congestion Control

VS/VD per ATM Forum Traffic Management Specification V.4.0
Explicit Rate (ER) stamping
EFCI tagging monitoring
ForeSight^®
Support for non-AAL5 traffic (enhanced -E and -EX models only)

ABR VS/VD

VS and VD resource management (RM) cell generation and termination
Virtual connection queue (VCQ) assigned to each VC ingress
VCQ configurable parameters:
- Separate cell discard threshold for CLP0 and CLP1 cells
- EPD threshold
- Maximum queue depth with PPD
- Reserved buffer space for RM cells
Support for UBR and VBR access
Interworking with ForeSight^® (enhanced -E and -EX models only)

Unspecified Bit Rate Service

UPC per ATM Forum UNI Specification V.3.1, TM V.4.0 and ITU-T I.371
Minimum cell rate configurable and guaranteed
EPD

Virtual Trunks

Support for up to 31 virtual trunks per card, each with 16 class-of-service queues
UNI and NNI option for the interface with public ATM network
Per virtual trunk traffic shaping
Reconfigurable maximum trunk rate

BXM T3/E3 Broadband Switch Module

Cell Buffering

Large ingress and egress cell buffer architecture
204,800 to 1,024,000 cells stored per card
- Accommodate large traffic bursts
- Avoid network congestion and cell discard
- Suited to TCP/IP traffic

Intelligent QoS (Quality of Service) Management Suite

Connection Admission Control (CAC)

Automatic Routing Management

Automatic end-to-end connection management mechanism
Deterministically allocates bandwidth and routes VCs autonomously over optimum network paths
Automatic rerouting preserves service integrity during network failures

Advanced CoS (Class of Service) Management

Up to 16 class-of-service queues, with independent service algorithms dedicated to each interface in the network

Optimized Bandwidth Management

Dedicated queue- and rate-controlled servers for each VCC/VPC
Dynamic thresholding, providing fairness and more than 95 percent utilization

ATM-Frame Relay (FR) Service Interworking

Provides transparent end-to-end connectivity, operating two services on a single switch platform

Switched Virtual Circuits

Signaling protocol per ATM Forum UNI Specification V.3.0 and V.3.1
E.164/NSAP addressing per ATM Forum UNI Specification V.3.1
Support for Private Network-Network Interface (PNNI) per ATM Forum PNNI Specification V.1.0

Fault Management and Reporting

Compliant with Bellcore GR-253-CORE

Alarms

Loss of Signal (LOS)
Loss of Pointer (LOP)
Loss of Frame (LOF)
Loss of Cell Delineation (LOC)
Alarm Indication Signal (AIS)
Remote Defect Indication (RDI)
Alarm integration up/down count

Performance Monitoring

Performance monitoring provided for line, section, and path
Bit Interleaved Parity (BIP) error detection
Far-End Block Error (FEBE) count
Unavailable Seconds (UAS)
Errored Seconds (ES)
Severely Errored Seconds (SES)
Header Checksum (HCS) monitoring

Statistics

ATM statistics collected on a per-VC basis
Four levels of ATM-layer statistics collection provided

OAM

Segment and end-to-end Operations, Administration and Maintenance (OAM) loopbacks supported per Bellcore TA-NWT-001248
External OAM segment flows, consisting of segment loopback cells per ATM Forum UNI Specification V.3.1 and ITU-T I.371
Generation and detection of AIS and RDI OAM cells
OAM cell generation and loopback facility supported for diagnostics and self-test purposes

Network Management

Management using Cisco Wan Manager software
Simple Network Management Protocol (SNMP)-based for configuration and statistics collection
Graphical user interface

Alarm Indicators

Via LEDs on face plate

Status Site Alarm LED Green Alarm LED Yellow Alarm LED Red

Card
Active

Standby

Fail

Port
Active and OK

Active—remote alarm

Active—local alarm

Physical Specifications

Dimensions: (H x W x D) 19 in x 1.1 in x 27 in (48.26 cm x 2.79 cm x 68.58 cm)
Weight: 6 lb (2.7 kg)

Electrical Specifications

Input power required: -48V DC
Power consumption: 100W

Electrical and Safety Standards Compliance

EMI/ESD compliance
- FCC Part 15
- Bellcore GR1089-CORE
- IEC 801-2
- EN55022
Safety compliance
- EN 60950
- UL 1950
Bellcore NEBS: Level 3-compliant

Summary Specifications

Product Number	Enhanced Model	Number of Ports per Card	Ingress Cell Buffer (cells)	Egress Cell Buffer (cells)	Number of Connections per Card	VC Merge Capable
BXM-T3-8, BXM-E3-8		8	102,400	102,400	16,384/32,768
BXM-T3-12, BXM-E3-12		12	133,120	235,520	16,384/32,768
BXM-T3-8E, BXM-E3-8E	Yes	8	256,000	256,000	16,384/32,768	Yes
BXM-T3-12E, BXM-E3-12E	Yes	12	256,000	256,000	16,384/32,768	Yes
BXM-T3-12EX, BXM-E3-12EX	Yes	12	512,,000	512,000	32,768	Yes

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Cisco BPX 8600 Series Switches