Cisco BPX 8600 Series Switches

BXM-622 Broadband Switch Module


Data Sheet

BXM-622 Broadband Switch Module

The BXM-622 is an ATM OC-12c/STM-4 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). It provides redundancy protection for card as well as line via SONET/SDH Automatic Protection Switching (APS). Its high-speed connectivity takes ATM to new levels of efficiency and scalability.

The enhanced models of the BXM-622 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 providing future support for vc merging for large MPLS-based IP+ATM networks.

Key Features

  • High scalability and connection densities with up to 24 OC-12c/STM-4 ATM ports on a single Cisco BPX® 8600 series wide-area network 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 VC merging with future software upgrade to allow "label" sharing for different MPLS VCs with the same destination and class of service (enhanced -D and -DX models only)

As Asynchronous Transfer Mode (ATM) switching becomes widely deployed in both service provider and enterprise networks, it brings to light an important issue: There is more to ATM networking than simply switching cells. ATM users need a network platform that cost-effectively delivers unprecedented levels of scalability, performance, and functionality.

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 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-622 broadband switch module is an OC-12c/STM-4 version of the BXM interface card for the BPX switch platform. It operates at the standard Synchronous Optical Network (SONET)/ Synchronous Digital Hierarchy (SDH) rate of 622.08 Mbps. One- and two-port versions of the card are available; both can be configured for either trunk or access application.

Technical Specifications

Physical Layer

  • 1- or 2- OC-12c/STM-4 (622.08 Mbps) ports
  • Complies with ATM Forum UNI Specification Version 3.1, 4.0
  • Cell transfer rate of 1,412,832 cells per second
  • Compliant with SONET standards:
    • Bellcore GR-253-CORE, TR-TSY-000020
    • ANSI T1.105
  • Compliant with SDH standards:
    • ITU-T G.707, G.708, and G.709
    • ITU-T G.957, G.958
  • 1:1 BXM redundancy
  • Support for SONET/SDH 1+1 and 1:1 APS

Fiber-optic interface options:

Back Card Source Tx Power (dBm) Rx Range (dBm) Physical Range (km)
Min Max Min Max

Laser 1310nm








Laser 1310nm








Laser 1550nm








  • 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 User-Network Interface (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 V.3.1, TM V.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
  • 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 -D and -DX 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 -D and -DX 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.37
  • 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 -D and -DX models)


  • VSs and VDs 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
  • Support for UBR and VBR access
  • Interworking with ForeSight® (enhanced -D and -DX 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

Cell Buffering

  • Large ingress and egress cell buffer architecture
  • 337,920 to 1,024,000 cells stored per card
    • Accommodate large traffic bursts
    • Avoid network congestion and cell discard
    • Suited to TCP/IP traffic

BXM-622 Broadband Switch Module

Intelligent QoS (Quality of Service) Management Suite

Connection Admission Control (CAC)

Automatic Routing Management Suite

  • Automatic end-to-end connection management mechanism
  • Deterministically allocates bandwidth and reroutes VCs autonomously over optimum network paths
  • 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 V3.1
  • 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


  • 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


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


  • 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

Protection Switching

  • Support for SONET/SDH Automatic Protection Switching (APS)
  • Supported per Bellcore GR-253-CORE, ITU-T G.783
  • 1+1, 1:1 and ITU-T G.783 Annex B option

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





Active & OK


Active—remote 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: 85W max.

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
  • Optical safety: IEC 825-1 (Class 1)

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