Wiring Specifications

This appendix lists the pinouts and wiring specifications for the EIA/TIA-232 admin. port, CDDI UTP, 10BaseT, SUM port, and the optical bypass switch.

Admin. Port Pinout

Table A-1 and Table A-2 list the pinouts for the EIA/TIA-232 admin. port.

Table  A-1: EIA/TIA-232 (Console) DTE Pinouts

At the Switch				At the Console (DTE)
Signal	Definition	RJ-45 Pin	Direction	DB-25 Pin	Signal
CTS	Clear To Send	1 <--	Output	4	RTS
DSR	Data Set Ready	2 <--	Output	20	DTR
RXD	Receive Data	3 <--	Output	2	TX
GND	Ground	4	-	7	GND
GND	Ground	5	-	-	-
TXD	Transmit Data	6 -->	Input	3	RXD
DTR	Data Terminal Ready	7 -->	Input	6	DSR
RTS	Request To Send	8 -->	Input	5	CTS

Table  A-2: EIA/TIA-232 (Modem) DCE Pinouts

At the Switch				At the Modem (DCE)
Signal	Definition	RJ-45 Pin	Direction	DB-25 Pin	Signal
CTS	Clear To Send	1 <--	Output	5	CTS
DSR	Data Set Ready	2 <--	Output	8	DCD
RXD	Receive Data	3 <--	Output	3	RX
GND	Ground	4	-	7	GND
GND	Ground	5	-	-	GND
TXD	Transmit Data	6 -->	Input	2	TX
DTR	Data Terminal Ready	7 -->	Input	20	DTR
RTS	Request To Send	8 -->	Input	4	RTS

CDDI UTP Pinout

Following are pinouts and cabling requirements for CDDI UTP wiring.
Table A-3 lists the pinout used for the CDDI/MLT-3 A/B port card transmit and receive pairs.

Table  A-3: CDDI/MLT-3 Pinout

Pin	Signal	Pin	Signal
1	TX+	5	-
2	TX-	6	-
3	-	7	RX+
4	-	8	RX-

You must use modular, cross-connect cables in the following configurations:

• From a workstation CDDI port to a CDDI-FDDI translator

• From a CDDI A port to a CDDI B port

• From a CDDI A or B port to a CDDI M port

Each of the four pairs of wires that make up the twisted-pair cross-connect cable must be individually twisted. For example, the wire pair connecting pins 1 and 2 at one end of the cable must connect to pins 8 and 7 at the other end. (See Figure A-1.)

Figure A-1: CDDI UTP Wiring Configuration--Cross-Connect Cables

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Note The EIA/TIA-568-B wiring scheme is recommended. Connect all four pairs of inside wiring cables to the wall outlet and patch panels.

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The cabling from A ports to B ports must be cross-connect, twisted-pair. Each of the four pairs of wires that make up the twisted-pair cable must be individually twisted. Table A-4 lists the EIA/TIA-568-B RJ-45 wiring scheme.

Table  A-4: EIA/TIA-568-B 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

10BaseT Pinout

The 10BaseT cabling from the workstation to the switch must be straight-through, twisted-pair. Each of the four pairs of wires that make up the twisted-pair cable must be individually twisted. Figure A-2 shows straight-through cables and Figure A-3 shows cross-connect cables.

Figure A-2: 10BaseT Twisted-Pair Wiring Configuration--
Straight-Through Cables


Figure A-3: 10BaseT Twisted-Pair Wiring Configuration--
Cross-Connect Cables

Table A-5 lists the pinout for Ethernet 10BaseT LAN port cabling.

Table  A-5: LAN Port Ethernet 10BaseT Pinout

Pin	Signal	Pin	Signal
1	RX+	5	-
2	RX-	6	TX-
3	TX+	7	-
4	-	8	-

SUM Port Pinout

Table A-6 lists the pinout for the optional Ethernet 10BaseT SUM port.

Table  A-6: SUM Port Ethernet 10BaseT Pinout

Pin	Signal	Pin	Signal
1	TX+	5	-
2	TX-	6	RX-
3	RX+	7	-
4	-	8	-

Optical Bypass Switch Pinout

Table A-7 lists the pinout for the optical bypass connector, and Figure A-4 shows the connector. The connector is a female Deutsche Industrie Norm (DIN) type.

Table  A-7: Optical Bypass Switch Connector Pinout

Pin	Function
1	V+
2	V+
3	Switch
4	Switch
5	GND
6	Bypass present

Figure A-4: Optical Bypass Connector