Cisco Systems MGX-FRSM-2T3E3, MGX-FRSM-2CT3 Frame Forwarding, ATM/Frame-to-User Network Interface

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Description of Connection Types on the FRSM

Command and Response Mapping

The FRSM provides command and response mapping in both directions:

•In the Frame Relay-to-ATM direction, the FRSM maps the C/R bit of the received Frame Relay frame to the CPCS-UU least significant bit of the AAL5 CPCS PDU.

•In the ATM-to-Frame Relay direction, the FRSM maps the least significant bit of the CPCS-UU to the C/R bit of the Frame Relay frame.

Translation and Transparent Modes

Each service interworking (SIW) connection can exist in either translation or transparent mode. In translation mode, the FRSM translates protocols between the FR NLPID encapsulation (RFC 1490) and the ATM LCC encapsulation (RFC 1483). In transparent mode, the FRSM does not translate. Translation mode support includes address resolution by transforming address resolution protocol (ARP, RFC 826) and inverse ARP (inARP, RFC 1293) between the Frame Relay and ATM formats.

Frame Forwarding

You can configure an individual port for frame forwarding. Frame forwarding is the same as standard Frame Relay except that the FRSM:

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Does not interpret the two-byte Q.922 header.

Maps all received frames to a specific connection if it exists, otherwise it discards the frames.

Does not map between DE and CLP or between FECN and EFI.

Does not support statistics for “Illegal header count” or “Invalid DLCI.”

Does generate statistics for “Discarded frame count due to no connection.”

ATM/Frame-to-User Network Interface

All FRSMs support the ATM Frame User-to-Network Interface (FUNI). When a frame arrives from the FUNI interface, the FRSM removes the 2-byte FUNI header and segments the frame into ATM cells by using AAL5. In the reverse direction, the FRSM assembles ATM cells from the network into a frame by using AAL5, adds a FUNI header to the frame, and sends it to the FUNI port.

Loss Priority Indication

The FRSM maps the loss priority indication for both directions:

•In the FUNI to ATM direction, the FRSM maps the CLP bit in the FUNI header to the CLP bit of every ATM cell that it generates for the FUNI frame.

•In the ATM-to-FUNI direction, the FRSM always sets the CLP bit in the FUNI header to 0.

Congestion Indication

The FRSM maps congestion indication in both directions:

•In the FUNI-to-ATM direction, it sets EFCI to 0 for every ATM cell it generates by segmentation.

•In the ATM-to-FUNI direction, it sets the CN bit in the FUNI header to 1 if the EFCI field in the last ATM cell of a received, segmented frame is 1. The two reserve bits (the same positions as C/R and BECN in Frame Relay header) are always 0.

6-26Cisco MGX 8850 Installation and Configuration, Release 1.1.00, Part Number 78-6186-02

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Contents Tasks for Configuring Cards and Services Modifying the Resource PartitioningSequence of Configuration Tasks Rules for Adding ConnectionsRules for Adding a DAX Connection Rules for Adding Three-Segment ConnectionsRules for Adding Management Connections Processor Switching Module Addport portnum linenum pctbw minvpi maxvpi Configuring Card-Level Parameters, Lines, and PortsCnfcdrscprtn numberPARconns numberPNNIconns numberTAGconns Automatic Protection Switching on the PXM Cnfatmln linenum typeProcessor Switching Module Adding Connections on a PXM in a Stand-Alone Node Cnfcon connID routepriority maxcost restricttrunktype CACCnfupcubr connID polType pcr0+1 cdvt0+1 IngPcUtil CLP ATM Universal Service Module Using the CLI to Configure the Card, Lines, and PortsCnfcdrscprtn 300 300 Cnfportq portnum qnum qalgo qdepth clphigh clplow efcithresAddimagrp groupnum porttype listoflinks minNumLink Using the CLI to Configure Inverse MultiplexingAdding and Configuring Connections on the AUSM/B Porttype Is the port type 1=UNI, 2=NN1Slot number, port number, vci, and vpi of the slave end Default is slave, so you actually do not need to type aConnID ATM Universal Service Module Adding and Configuring Connections on the AUSM/B Efcithresh Is the Efci threshold in the range 1-16000 cells BPX 8600-to-BPX 8600 SegmentEpdthreshold Very High Speed Frame Service Modules Frame Service Module FeaturesTypes of Frame Service Modules IntroductionFrame Service Module Features Four-Port Unchannelized Frame Service Module forMGX-FRSM-2CT3 Features MGX-FRSM-2T3E3 FeaturesEight-Port Frsm Features MGX-FRSM-HS2/B FeaturesMGX-FRSM-HS1/B Features Congestion Indication for NIW Connections Description of Connection Types on the FrsmFrame Relay-to-ATM Network Interworking Cell Loss Priority Frame Relay-to-ATM Service InterworkingPVC Status Management Congestion Indication ATM/Frame-to-User Network Interface Command and Response MappingFrame Forwarding Translation and Transparent ModesCnfln linenum linetype linerate Configuring Frame Relay ServiceConfiguring the Frsm Cards, Lines, and Ports Addport portnum linenum porttype Addport portnum linenum ds0speed beginslot numslot porttypeAddport portnum porttype Cnfport portnum lmisig asyn elmi T391 T392 N391 N392 N393Configuring Frame Relay Service Adding a Frame Relay Connection Addred redPrimarySlotNum redSecondarySlotNum redTypeConfiguring Frame Relay Service Cnfchanmap channum chanType FECN/EFCI DE to CLP CLP to DE =NIWTest Commands for the FRSMs Establishing the BPX 8600-to-BPX 8600-Series SegmentBit Error Rate Testing on an Unchannelized T3 or E3 Frsm Cell Delay Treatment Circuit Emulation Service Module for T3 and E3Features Configuring Service on a T3 or E3 Cesm Error and Alarm ResponseConfiguring the Card, Lines, and Ports Adding and Modifying ConnectionsAddcon portnum mastership remoteConnId Cnfcon portnum Cdvt CellLossIntegPeriod bufsizeBit Error Rate Testing on a T3 or E3 Cesm Unstructured Data Transfer Eight-Port Circuit Emulation Service ModulesStructured Data Transfer Redundancy Support for the Eight-Port Cesm Cell Delay TreatmentError and Alarm Response Configuring Service on an Eight-Port Cesm Cnfln linenum linecode linelen clksrc E1-signalingConfiguring Bulk Distribution and Redundancy Addport portnum linenum beginslot numslot porttypeAdding and Modifying Connections Eight-Port Circuit Emulation Service Modules Service Resource Module Configuring Card and Line ParametersBulk Distribution for T1 Service Redundancy Support by the MGX-SRM-3T3/BRedundancy . Only an SRM can support 1 N redundancy Configuring Redundancy Through the Redundancy BusTo specify 11 redundancy. Enter a 2 to specify 1 N Card pair. Permissible slot numbers are in the range Bit Error Rate Testing Through an MGX-SRM-3T3Configuring Redundancy Through the Distribution Bus 11-14, 17-22,Bit Error Rate Testing Through an MGX-SRM-3T3 Pattern Test for AX-FRSM-8E1 and MGX-CESM-8E1 Pattern Test Options In-band/ESFLoopback Test Options

MGX-FRSM-HS2, MGX-FRSM-2T3E3, MGX-FRSM-2CT3 specifications

Cisco Systems is a leader in networking technology and infrastructure, providing solutions that drive innovation and efficiency for businesses worldwide. Among its diverse range of products, the MGX series stands out as a pivotal component for the network-centric era, especially with models like MGX-FRSM-2CT3, MGX-FRSM-2T3E3, and MGX-FRSM-HS2. These modules are primarily designed for the MGX 8800 series routers, facilitating efficient traffic management and service delivery.

The MGX-FRSM-2CT3 is a versatile module that supports two T3 connections. It allows network operators to seamlessly integrate high-capacity circuit-switched and packet-switched data on a unified platform. This versatility is crucial for service providers looking to enhance their bandwidth offerings while ensuring reliable performance across voice, video, and data applications.

In contrast, the MGX-FRSM-2T3E3 module caters to operators needing E3 support. This feature allows for efficient data transport over a broader bandwidth, catering to European standards. The E3 configuration is vital for service providers operating in Europe or regions that utilize E3 technology prominently.

The MGX-FRSM-HS2 module is another significant offering, designed to accommodate the increasing demand for high speed and high capacity. It supports higher-order TDM and packet technologies, enabling operators to implement advanced services such as VoIP, video conferencing, and other data-intensive applications. This module provides scalability and reliability, making it ideal for next-generation networks.

All three modules leverage Cisco’s advanced switching and routing technology, ensuring optimal performance and minimal latency. The integration of Quality of Service (QoS) features allows network administrators to prioritize traffic types effectively, ensuring mission-critical applications receive the necessary bandwidth.

Additionally, these MGX modules support various signaling protocols, enabling interoperability with existing network infrastructure while also facilitating the migration to newer technologies. They play an essential role in modernizing telecom networks, allowing service providers to adapt to changing market demands and technology landscapes.

In summary, the Cisco MGX-FRSM-2CT3, MGX-FRSM-2T3E3, and MGX-FRSM-HS2 modules are key components for businesses looking to enhance their networking capabilities. With their robust support for T3 and E3 technologies, high scalability, and advanced QoS features, these modules empower service providers to deliver a wide range of services, drive innovation, and meet the growing demands of users in an increasingly connected world.
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