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Cabling Specifications

Cabling Specifications

This appendix contains pinout information for WS-C1400 Concentrator and adapter ports, the admin. interface port, and the optical bypass switch connector.

CDDI Cabling

Following are the cable considerations for the CDDI ports.

Figure D-1 shows the pinout for the CDDI/MLT-3 concentrator and adapter ports for A, B, M, and S ports.


Figure D-1:

CDDI Concentrator Port Pin Arrangement

Following are pinouts and cabling requirements for CDDI UTP wiring. Table D-1 lists the pinout used for the CDDI/MLT-3 transmit and receive pairs.


Table  D-1: CDDI/MLT-3 Pinout
Pin Signal Pin Signal
1 TX+ 5 -
2 TX- 6 -
3 - 7 RX+
4 - 8 RX-

The EIA-568 wiring scheme is recommended. Table D-2 lists the EIA 568 RJ-45 wiring scheme.


Table  D-2: EIA-568 RJ-45 Wiring Scheme
Pin Pair Color
1 2 White/orange
2 2 Orange
3 3 White/green
4 1 Blue
5 1 White/blue
6 3 Green
7 4 White/brown
8 4 Brown

Figure D-2 shows examples of modular cross-connect cables used for CDDI/MLT-3 connections between various devices using the CDDI-FDDI translator.


Figure D-2:

CDDI/MLT-3 Connections Using Cross-Connect Cable

Admin. Port Cabling

The cabling for the concentrator admin. port must be straight-through, twisted-pair. Each of the four pairs of wires that make up the twisted-pair cable must be individually twisted.

Table D-3 and Table D-4 list the pinouts for the EIA/TIA-232 admin. port.


Table  D-3: EIA/TIA-232 DTE Pinout
Switch Terminal (DTE)
Signal RJ-45 Pin Direction DB-25 Pin Signal
CTS 1 Output 4 RTS
DSR 2 Output 20 DTR
RXD 3 Output 2 TXD
GND 4 - 7 GND
GND 5 - - -
TXD 6 Input 3 RXD
DTR 7 Input 6 DSR
RTS 8 Input 5 CTS

Table D-4 lists the pinout for a null-modem cable used with the admin. port. Modems are considered to be data communication equipment (DCE).


Table  D-4: EIA/TIA-232 DCE Pinout
Switch Modem (DCE)
Signal RJ-45 Pin Direction DB-25 Pin Signal
CTS 1 Output 5 CTS
DSR 2 Output 6 DCD
RXD 3 Output 3 RXD
GND 4 - 7 GND
GND 5 - - GND
TXD 6 Input 2 TXD
DTR 7 Input 20 DTR
RTS 8 Input 4 RTS

Optical Bypass Switch Pinout

Figure D-3 shows the pinout and connector for the optical bypass switch. The connector is a standard female DIN type.


Figure D-3:

Optical Bypass Connector

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