Cisco Systems IGX 8400 manual Subrate Interface Card BC-SR

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Network Trunk Module

Subrate Interface Card (BC-SR)

The back card/subrate (BC-SR) terminates subrate trunks on the NTM. A subrate trunk uses part of the E1 or T1 bandwidth. The BC-SR typically functions in tail circuits or where little trafﬁc exists.

A subrate trunk facility interface operates in DCE mode, and the subrate channel functions like a synchronous data channel. Therefore, the IGX BC-SR always operates in DTE mode. Only leased lines are supported (no dial-up lines). Subrate trunks cannot pass clock signals between nodes.The BC-SR provides the following:

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Trunk line interfaces to subrate trunks

Trunk rates of: 256 Kbps, 384 Kbps, 512 Kbps, 768 Kbps, 1.024 Mbps, 1.536 Mbps, 1.920 Mbps

V.11/X.21, V.35, and EIA/TIA-449 interfaces

Synchronization of the trunk clocking with looped clock option (not applicable to X.21)

A limited set of EIA control leads monitored by the system

Figure 4-25and Table 4-19describe the BC-SR faceplate. When you correlate the ﬁgure and table, read from the top down.

Table 4-20lists the data signals and EIA leads supported by the subrate interface.

4-42Cisco IGX 8400 Series Reference

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Contents Trunk Cards Trunk Interface Cards Trunk Front Cards Card Acronym Card NameTrunk Card Maintenance Trunk Operating ModesLoopback Test Introduction to the UXM-E Trunk Mode Universal Switching Module EnhancedDetermining the UXM-E’s Mode of Operation Example Networks with UXM-EsUXM-E Trunk Features UXM-Es in a Network with Heterogeneous TrafﬁcUXM-E Interfaces Back Cards for the UXM-ECard Name Card Description UXM-E Front Card Cabled UXM-E Redundancy Switchover to a Redundant UXM-EMaximum Number of UXM-Es UXM-E Status LEDs Fail Active Standby Status of CardCellbus Bandwidth Usage Card MismatchUXM-E as a Clock Source Planning for Cellbus Bandwidth Allocation OC3Calculating Cellbus Bandwidth Changes ATM Across a Public ATM NetworkTypes of Supported Trafﬁc UXM-E in Trunk ModeRouting over Cell Trunks Only Trafﬁc from FastPacket-Based Cards Trafﬁc TypeTypes of Connections on a UXM-E Trunk Inverse Multiplexing over ATM on IGX TrunksAdding an IGX Feeder Adding and Removing IMA Group Links Line RedundancyRouting Feeder Connection Cell Endpoint a Endpoint B Type IMA ProtocolTwo-Segment Connections Gateway Type Routing Load TypeRT-VBR Gwtypenone Three-Segment ConnectionsFeeder Connection Cell Endpoint a Endpoint B Type ABR.FST GwtypenoneActivation and Conﬁguration of a UXM-E in Trunk Mode UXM-E AtfrOC3 STM1 SMF 20Cisco IGX 8400 Series Reference BXM Alarms for Physical Lines and Logical TrunksSCR and PCR Policing at Less than 50 CPS on UXM-E IGX-UXM-ETrunk Statistics for Troubleshooting 10 PCR Policing Application ExampleSummary Statistics UXM-E Interface CardsConnectors and LEDs for SMF and MMF Back Cards Connector/Indicator FunctionOC-3/STM1 Back Cards 11 BC-UAI-4-155-SMF Faceplate T3 Back Cards 12 BC-UAI-2-155-SMF FaceplateConnectors and LEDs for BC-UAI-6-T3 and BC-UAI-3-T3 Connectors/Indicator FunctionBC-UAI-6-T3 Faceplate E3 Back Cards 14 BC-UAI-3-T3 FaceplateConnectors and LEDs for BC-UAI-6-E3 and BC-UAI-3-E3 BC-UAI-6-E3 FaceplateT1 Back Cards 16 BC-UAI-3-E3 FaceplateBC-UAI-8-T1-DB-15 Faceplate E1 Back Cards 18 BC-UAI-4-T1-DB-15 FaceplateBC-UAI-8-E1 DB-15 Faceplate Port 21 BC-UAI-4-E1 DB-15 Faceplate 22 BC-UAI-4-E1 BNC Faceplate Cable Redundancy for the NTM NTM StatusNetwork Trunk Module T1 Interface Card BC-T1 BC-T1 Faceplate Description 23 BC-T1 Faceplate BC-T1 Connections and Status LEDsE1 Interface Back Card BC-E1 BC-E1 Connections and Status LEDs RX-TXSubrate Interface Card BC-SR Connection/Indicator Function BC-SR Connections and Status LEDsY1 Interface Back Card BC-Y1 BC-Y1 Connections and Status LEDs RX MONTX MON 46Cisco IGX 8400 Series Reference