Connectors and Cables

This appendix provides connector and cable descriptions and pinout information for the following ports on the switch:

• 10BaseT ports and 100BaseTX ports

• 100BaseFX port

• AUI port

• Console port

10BaseT and 100BaseTX Ports

The 100BaseTX ports (port Ax and Bx) and the 10BaseT ports (1x through 12x or 24x) use standard RJ-45 connectors and pinouts with internal crossovers, as shown in Figure B-1 and Table B-1.

Figure B-1: RJ-45 Connector

Table B-1: RJ-45 Connector Pinouts

Pin	Label
1	RD+
2	RD-
3	TD+
4	NC
5	NC
6	TD-
7	NC
8	NC

As indicated by the X, the 10BaseT and 100BaseTX ports have their transmit (TD) and receive (RD) signals internally crossed for attachment of an adapter using a straight-through cable.

When connecting the 10BaseT ports to 10BaseT-compatible servers and workstations, ensure that you use a straight-through cable wired for 10BaseT. When connecting to other switches or repeaters, ensure that you use a crossover cable.

When connecting the 100BaseTX ports to 100BaseT-compatible servers and workstations, ensure that you use a straight-through cable. When connecting to the 100BaseTX port on another switch, hub, or router, ensure that you use a crossover cable.

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Note Always observe the following general rules when connecting devices: Use a straight-through cable to connect two ports when one of the ports is designated with an X; use a crossover cable to connect two ports when both ports are designated with an X.

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The schematics of crossover and straight-through cables are shown in Figure B-2 and Figure B-3, respectively.

Figure B-2: Crossover Cable Schematic


Figure B-3: Straight-Through Cable Schematic

100BaseFX Port

The 100BaseFX port (port Ax) uses a duplex SC connector, as shown in Figure B-4.

Figure B-4: SC Connector

AUI Port

The AUI port uses a 15-pin female connector and pinouts, as shown in Figure B-5 and Table B-2.

Figure B-5: AUI Connector

Table B-2: AUI Connector Pinouts

Pin	Label	Description
1	GND	Ground
2	CI+	Positive AUI differential collision-data input
3	TX+	Positive AUI differential transmit-data input
4	GND	Ground
5	RX+	Positive AUI differential receive-data output
6	GND	Ground
7	NC	--
8	GND	Ground
9	CI-	Negative AUI differential collision data
10	TX-	Negative AUI differential transmit-data input
11	GND	Ground
12	RX-	Negative AUI differential receive data output
13	+12V	12V supply for external MAU
14	GND	Ground
15	NC	--

Console Port

The console port uses an 8-pin RJ-45 connector, as shown in Figure B-1. The supplied RJ-45-to-RJ-45 rollover cable and adapters are used to connect the console port of the switch to a console terminal or modem. The following sections describe the rollover cable and adapters for the console port.

Identifying a Rollover Cable

You can identify a rollover cable by comparing the two modular ends of the cable. Hold the cable ends side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left plug should be the same color as the wire connected to the pin on the outside of the right plug (see Figure B-6).

Figure B-6: Identifying a Rollover Cable

Connecting to a PC

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-9 female DTE adapter (labeled "TERMINAL") to connect the console port to a PC running terminal emulation software. Figure B-7 shows how to connect the console port to a PC. Table B-3 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-9 female DTE adapter (labeled "TERMINAL").

Figure B-7: Connecting the Console Port to a PC

Table B-3: Console Port Signaling and Cabling Using a DB-9 Adapter

Console Port (DTE)	RJ-45-to-RJ-45 Rollover Cable		RJ-45-to-DB-9 Terminal Adapter	Console Device
Signal	RJ-45 Pin	RJ-45 Pin	DB-9 Pin	Signal
RTS	11	8	8	CTS
DTR	2	7	6	DSR
TxD	3	6	2	RxD
GND	4	5	5	GND
GND	5	4	5	GND
RxD	6	3	3	TxD
DSR	7	2	4	DTR
CTS	81	1	7	RTS

Connecting to a Terminal

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 female DTE adapter (labeled "TERMINAL") to connect the console port to a terminal. Figure B-8 shows how to connect the console port to a terminal. Table B-4 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter (labeled "TERMINAL").

Figure B-8: Connecting the Console Port to a Terminal

Table B-4: Console Port Signaling and Cabling Using a DB-25 Adapter

Console Port (DTE)	RJ-45-to-RJ-45 Rollover Cable		RJ-45-to-DB-25 Terminal Adapter	Console Device
Signal	RJ-45 Pin	RJ-45 Pin	DB-25 Pin	Signal
RTS	11	8	5	CTS
DTR	2	7	6	DSR
TxD	3	6	3	RxD
GND	4	5	7	GND
GND	5	4	7	GND
RxD	6	3	2	TxD
DSR	7	2	20	DTR
CTS	81	1	4	RTS

Connecting to a Modem

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 male DCE adapter (labeled "MODEM") to connect the console port to a modem. Figure B-9 shows how to connect the console port to a modem. Table B-5 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter (labeled "MODEM").

Figure B-9: Connecting the Console Port to a Modem

Table B-5: Console Port Signaling and Cabling Using a DB-25 Adapter

Console Port (DTE)	RJ-45-to-RJ-45 Rollover Cable		RJ-45-to-DB-25 Modem Adapter	Modem
Signal	RJ-45 Pin	RJ-45 Pin	DB-25 Pin	Signal
RTS	11	8	4	RTS
DTR	2	7	20	DTR
TxD	3	6	3	TxD
GND	4	5	7	GND
GND	5	4	7	GND
RxD	6	3	2	RxD
DSR	7	2	8	DCD
CTS	81	1	5	CTS