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Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter2 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 2-39
to 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.