Cisco Systems MGX 8220 manual Frame Relay Service Modules FRSMs, Frsm Connection Types

Chapter

Frame Relay Service Modules (FRSMs)

Frame Relay Service Modules (FRSMs)

The primary function of the FRSM is to convert between the Frame Relay formatted data and ATM/AAL5 cell-formatted data. There are two main types of FRSMs, those for T1 or E1 lines and those for high speed serial lines.

All FRSMs include the following features:

•ForeSight closed-loop rate control and per-VC queuing

•Wire-speed performance on all ports

•SVC and multicast support within Cisco service nodes

•Standard and enhanced LMI management interfaces (Annex A and Annex D) Module-specific features are described in the sections listed below.

•FRSM Connection Types, page 4-2

•FRSMs for T1 and E1 lines, page 4-7

•FRSMs for High Speed Serial Lines, page 4-9

•Frame Relay Access Service Module, page 4-11

FRSM Connection Types

FRSMs convert the header format and translate the address for

•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)

This section describes the connection types that can be configured on the FRSM to perform these functions.

•Frame-Relay-to ATM Network Interworking (NIW), page 4-2

•Frame-Relay-to ATM Service Interworking (SIW), page 4-4

•Frame Forwarding, page 4-6

•Frame-basedUser-to-Network Interface (FUNI), page 4-6

Frame-Relay-to ATM Network Interworking (NIW)

Frame Relay-to-ATM network interworking (NIW) supports a permanent virtual connection (PVC) between two Frame Relay users over a Cisco network or a multi-vendor network. The traffic crosses the network as ATM cells. To specify NIW for a connection, add the connection with a channel type of network interworking.

Figure 4-1shows a BPX 8620 network with network interworking connections.

	Cisco MGX 8220 Installation and Configuration
4-2	Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003