Cisco Systems MGX 8230 manual FRSMs for Serial Connections, FRSM-HS1/B X.21 and V.35 Interfaces

Chapter 2 Module and Service Descriptions

Frame Relay Service Modules

FRSMs for Serial Connections

The FRSMs that support serial connections include the following:

•MGX-FRSM-HS2: provides unchannelized Frame Relay service over two HSSI lines on the SCSI2-2HSSI back card. Each port can operate in either DTE or DCE mode.

•MGX-FRSM-HS1/B: supports four V.35 or four X.21 ports. Each port can operate in DTE or DCE mode. The mode depends on the type of attached cable. See MGX-FRSM-HS1/B Cabling, page 2-39to determine the correct cabling for the intended mode of each port.

FRSM-HS1/B X.21 and V.35 Interfaces

Features specific to the FRSM-HS1/B with X.21 and V.35 interfaces are:

•Four X.21 or four V.35 lines

•DCE/DTE selection on a per-port basis

•As DCE, clock speeds of 48 Kbps, 56 Kbps, n x 64 Kbps up to 2 Mbps, n x 1.5 Mbps and n x 2 Mbps, up to 8 Mbps, are supported

•As DTE, obtains clock from line, up to 8 Mbps

•The total maximum throughput of all lines on a card is 16Mbps

•Supports 200 DLCIs per card

•Support for per-VC queueing on ingress with closed-loop traffic management

•Support for two priority levels of egress port queues for data traffic

•Various DCE/DTE loopbacks

FRSM-HS2 HSSI Interfaces

Features specific to the FRSM-HS2 with HSSI interfaces are:

•Two HSSI lines

•DCE/DTE selection on a per-port basis

•As DCE, clock speeds of n x 1.5 Mbps and n x 2 Mbps, up to 52 Mbps, are supported

•As DTE, obtains clock from line, up to 52 Mbps

•Supports 2000 DLCIs per card

•Support for per-VC queueing on ingress with closed-loop traffic management

•Support for five classes of service (high-priority, rt-VBR, nrt-VBR, ABR, UBR) for data traffic

•Various DCE/DTE loopbacks

•1:1 redundancy with Y-cabling for FRSM-HS2 cards

Card Combinations

•MGX-FRSM-HS2 with a SCSI2-2HSSI back card

•MGX-FRSM-HS1/B with a MGX-12IN1-S4 back card

Illustrations

•For the MGX-FRSM-HS2 front card, see Figure 2-20 on page 2-41.

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
2-38	Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001