Connectors and Cables

This appendix describes the cables, connectors, and adapters that can connect to
Catalyst 2900 series ports.

Note The Catalyst 2900 Series XL Modules Installation Guide contains descriptions of the ports on the Catalyst 2900 series modules.

10/100 Ports

All fixed ports use standard RJ-45 connectors and Ethernet pinouts with internal crossovers, as indicated by an X. These ports have their transmit (TD) and receive (RD) signals internally crossed for attachment of an adapter using a straight-through cable. Figure B-1 shows the pinout.

When connecting the 10/100 ports to compatible servers and workstations, ensure that you use a straight-through cable wired for 10BaseT and 100BaseTX. When connecting to other switches or repeaters, ensure that you use a crossover cable.

Note 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.

Figure B-1:

10/100 Pinout

Crossover and Straight-Through Cable Pinouts

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

Figure B-2: Crossover Cable Schematic

Figure B-3: Straight-Through Cable Schematic

Console Port

The console port uses an 8-pin RJ-45 connector, as shown in Figure B-5 and described in Table 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 PC or terminal. The following sections describe the rollover cable and adapters for the console port.

Identifying a Ro llover 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-4).

Figure B-4: Identif ying 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 to connect the console port to a PC running terminal emulation software. Figure B-5 shows how to connect the console port to a PC. Table B-1 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.

Figure B-5: Connecting the Console Port to a PC

**Table B-1: Console Port Signaling and Ca bling 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
Not connected.	2	7	6	DSR
TxD	3	6	2	RxD
GND	4	5	5	GND
GND	5	4	5	GND
RxD	6	3	3	TxD
Not connected.	7	2	4	DTR
CTS	81	1	7	RTS

¹ Pin 1 is connected (inside the terminal adapter) to Pin 8.

Connecting to a Terminal

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 female DTE adapter to connect the console port to a terminal. Figure B-6 shows how to connect the console port to a terminal. Table B-2 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.

Figure B-6: Connecting the Console Port to a Terminal

**Table B-2: Console Port Signaling and Cabling U sing 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
Not connected.	2	7	6	DSR
TxD	3	6	3	RxD
GND	4	5	7	GND
GND	5	4	7	GND
RxD	6	3	2	TxD
Not connected.	7	2	20	DTR
CTS	81	1	4	RTS

¹ Pin 1 is connected (inside the terminal adapter) to Pin 8.

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