Table Of Contents
Connectors and Cable Specifications
Cable and Adapter Specifications
Crossover and Straight-Through Cable Pinouts
Connectors and Cable Specifications
This appendix describes the Catalyst 2900 XL switch ports and the cables and adapters that you use to connect the switch to other devices.
Connector Specifications
10/100 Ports
The 10/100 Ethernet ports use standard RJ-45 connectors and Ethernet pinouts with internal crossovers, as shown by an X in the port name. These ports have their transmit (TD) and receive (RD) signals internally crossed so that a straight-through cable and an adapter can be attached to the port. Figure B-1 shows the pinouts.
Figure B-1 10/100 Port Pinouts
When connecting the 10/100 ports to compatible workstations, servers, routers, and Cisco IP Phones, you must use a straight-through cable wired for 10BASE-T and 100BASE-TX. (Figure B-5 shows the straight-through cable schematics.) When connecting to other switches or repeaters, you must use a crossover cable. (Figure B-4 shows the crossover cable schematics.)
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 connectors and cables are designated with an X or when both ports do not have an X.
100BASE-FX Ports
100BASE-FX ports use duplex SC connectors, as shown in Figure B-2. These ports use 10/125- or 62.5/125-micron multimode fiber-optic cabling.
Figure B-2 100BASE-FX SC Connector
LRE Ports
The LRE ports use a single RJ-21 connector, as shown in Figure B-3.
Figure B-3 RJ-21 Connector
Console Port
The console port uses an 8-pin RJ-45 connector, described in Table B-2 and Table B-4. The supplied RJ-45-to-RJ-45 rollover cable and DB-9 adapter are used to connect the console port of the switch to a console PC. You need to provide a RJ-45-to-DB-25 female DTE adapter if you want to connect the switch console port to a terminal. You can order a kit (part number ACS-DSBUASYN=) containing that adapter from Cisco. For console port and adapter pinout information, see Table B-2 and Table B-4.
Cable and Adapter Specifications
Crossover and Straight-Through Cable Pinouts
The schematics of crossover and straight-through cables are shown in Figure B-4 and Figure B-5.
Figure B-4 Crossover Cable Schematic
Figure B-5 Straight-Through Cable Schematic
RJ-21 Cable Pinouts
Note
Console Port
The console port uses an 8-pin RJ-45 connector, as shown in Figure B-7 and described in Table B-2. The supplied RJ-45-to-RJ-45 rollover cable and adapters 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 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 (both provided) 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-2 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-7 Connecting the Console Port to a PC
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. 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.
Note
Table B-4 Console Port Signaling and Cabling Using a DB-25 Adapter
