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This appendix describes the connectors, cables, and adapters that you use to connect the switch to other devices.
These sections describe the connectors used with the Catalyst 2950 switches.
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 the transmit (TD) and receive (RD) signals internally crossed so that a twisted-pair straight-through cable and adapter can be attached to the port. Figure B-1 shows the pinout.
When connecting 10/100 ports to compatible devices, such as servers, workstations, and routers, you can use a two or four twisted-pair, straight-through cable wired for 10BASE-T and 100BASE-TX. Figure B-6 shows the two twisted-pair, straight-through cable schematics. Figure B-8 shows the four twisted-pair, straight-through cable schematics.
When connecting the ports to other devices, such as switches or repeaters, you can use a two or four twisted-pair, crossover cable. Figure B-7 shows the two twisted-pair, crossover cable schematics. Figure B-9 shows the four twisted-pair, crossover cable schematics.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T-compatible devices. You must use Category 5 cabling when connecting to 100BASE-TX-compatible devices.
The 100BASE-FX ports use MT-RJ connectors, shown in Figure B-2. The 100BASE-FX ports use 50/125- or 62.5/125-micron multimode fiber-optic cabling.
You can connect a 100BASE-FX port to an SC or ST port on a target device by using one of the MT-RJ fiber-optic patch cables listed in Table B-1. Use the Cisco part numbers in Table B-1 to order the patch cables that you need.
The 10/100/1000 Ethernet ports on Catalyst 2950T-24 switches use standard RJ-45 connectors. Figure B-3 shows the pinout.
When connecting the ports to 10BASE-T- and 100BASE-TX-compatible devices, such as servers, workstations, and routers, you can use a two or four twisted-pair, straight-through cable wired for 10BASE-T and100BASE-TX. Figure B-6 shows the two twisted-pair, straight-through cable schematics. Figure B-8 shows the four twisted-pair, straight-through cable schematics.
When connecting the ports to 10BASE-T- and 100BASE-TX-compatible devices, such as switches or repeaters, you can use a two or four twisted-pair, crossover cable. Figure B-7 shows the two twisted-pair, crossover cable schematics. Figure B-9 shows the four twisted-pair, crossover cable schematics.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T-compatible devices. You must use Category 5 cabling when connecting to 100BASE-TX-compatible devices.
When connecting the ports to 1000BASE-T-compatible devices, such as servers, workstations, and routers, you must use a four twisted-pair, Category 5, straight-through cable wired for 10BASE-T, 100BASE-TX, and 1000BASE-T. Figure B-10 shows the straight-through cable schematics.
When connecting the ports to other devices, such as switches or repeaters, you must use a four twisted-pair, Category 5, crossover cable. Figure B-11 shows the crossover cable schematics.
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Note Be sure to use a four twisted-pair, Category 5 cable when connecting to a 1000BASE-T-compatible device. |
1000BASE-X Gigabit Interface Converter (GBIC) module ports use duplex SC connectors, as shown in Figure B-4.
The GigaStack GBIC module ports use proprietary connectors, as shown in Figure B-5. The GigaStack GBIC cables are proprietary, high-data-rate cables with enhanced signal integrity and EMI protection.
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Caution Do not use standard IEEE 1394 cables with the GigaStack GBIC. |
The console port uses an 8-pin RJ-45 connector. You can connect a switch to a PC through the console port and the supplied RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-9 adapter. If you want to connect a switch to a terminal, you need to provide an RJ-45-to-DB-25 female DTE adapter. You can order a kit (part number ACS-DSBUASYN=) with that adapter from Cisco. For console-port and adapter-pinout information, see Table B-2 and Table B-3.
These sections describe the cables and adapters used with Catalyst 2950 switches.
Figure B-6 and Figure B-7 show the schematics of two twisted-pair cables for 10/100 ports.
Figure B-8 and Figure B-9 show the schematics of four twisted-pair cables for 10/100 ports.
Figure B-10 and Figure B-11 show the schematics of four twisted-pair cables for 10/100/1000 ports on Catalyst 2950T-24 switches.
This section describes how to identify a rollover cable and also describes the adapter pinouts.
You can identify a rollover cable by comparing the two modular cable ends. 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-12.)
Use the supplied 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-13 shows how to connect the console port to a PC. Table B-2 lists the pinouts for the console port, the rollover cable, and the RJ-45-to-DB-9 adapter.
Table B-2 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 |
Use the supplied RJ-45-to-RJ-45 rollover cable and an RJ-45-to-DB-25 female DTE adapter to connect the console port to a terminal. Figure B-14 shows how to connect the console port to a terminal. Table B-3 lists the pinouts for the console port, the rollover cable, and the RJ-45-to-DB-25 adapter.
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Note The RJ-45-to-DB-25 female DTE adapter is not supplied with the switch. You can order a kit (part number ACS-DSBUASYN=) with that adapter from Cisco. |
Table B-3 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 |
Posted: Wed Jun 4 11:50:51 PDT 2003
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