Frame Relay Service Modules; Features Common To All Frsms; Data-Link Layer Features; Frame Relay Features - Cisco MGX 8230 Installation And Configuration Manual

Frame Relay Service Modules

Frame Relay Service Modules
The primary function of the Frame Relay Service Modules (FRSM) is to convert between the Frame
Relay formatted data and ATM/AAL5 cell-formatted data. For an individual connection, you can
configure network interworking (NIW), service interworking (SIW), ATM-to-Frame Relay UNI (FUNI),
or frame forwarding. An FRSM converts the header format and translates the address for:
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This section contains the following information:
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Features Common to All FRSMs

This section describes features common to all FRSMs. For features specific to the individual module
types, see
Configuring Frame Relay Service, page

Data-Link Layer features

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Frame Relay features

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Cisco MGX 8230 Edge Concentrator Installation and Configuration
2-20
Frame Relay port number and DLCI
ATM-Frame UNI (FUNI) port number and frame address or frame forwarding port
ATM virtual connection identifier (VPI/VCI)
Configuring Frame Relay Service, page 6-27
Features Common to All FRSMs, page
Redundancy for Frame Service Modules, page
Connection Types on the FRSM, page
Types of Frame Service Modules, page
– FRSMs for T1 and E1 Lines, page
FRSMs for T3 and E3 lines, page
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– FRSMs for Serial Connections, page
Types of Frame Service Modules, page
Each logical port on an FRSM independently configurable to run Frame Relay UNI, Frame Relay
NNI, ATM FUNI, or frame forwarding.
7E flags used to delineate frames (with bit stuffing to prevent false flags) and for interframe gaps.
One flag between frames is considered valid upon receipt.
Supports configuration of one- or two-flag minimum interframe gap for transmission.
Valid frame sizes from 5 up to 4510 octets.
Each logical port independently configurable as Frame Relay UNI or Frame Relay NNI.
Meets ANSI T1.618, using two-octet headers.
Interpreted CCITT-16 CRC at end of the frame (frame discard if in error).
Supports ITU-T Q.933 Annex A, ANSI T1.617 Annex D, and LMI local management for
semipermanent virtual circuits (both UNI and NNI portions); enhanced LMI provides
autoconfiguration of traffic management parameters for attached Cisco routers.
Chapter 2
for instructions to configure the FRSMs.
2-20.
2-22.
2-22.
2-27.
2-27.
2-32.
2-38.
2-27. For information to configure the FRSMs, see
6-27.
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Module and Service Descriptions