|
|
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 and contains this information:
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 other 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-10 shows the two twisted-pair, straight-through cable schematics. Figure B-12 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-11 shows the two twisted-pair, crossover cable schematics. Figure B-13 shows the four twisted-pair, crossover cable schematics.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T devices. You must use Category 5 cabling when connecting to 100BASE-TX devices.
The 10/100/1000 Ethernet ports on Catalyst 2950T-24, Catalyst 2950T-48-SI, and Catalyst 2950 Long-Reach Ethernet (LRE) switches use standard RJ-45 connectors. Figure B-2 shows the pinout.
 |
Note On the Catalyst 2950 LRE switches, the four input uplink ports are bundled as two
logical ports, each consisting of a copper 10/100/1000 port and a fiber-optic small
form-factor pluggable (SFP) module slot, respectively. Within each logical port, you can use only the copper or the fiber-optic port at one time. If the Catalyst 2950 LRE switch senses more than two connections for both logical ports, the switch chooses the fiber-optic connections over the copper connections in default operation. See the "SFP Module Slots" section for more information on LRE uplink logical ports. |
When connecting the ports to 10BASE-T and 100BASE-TX 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-10 shows the two twisted-pair, straight-through cable schematics. Figure B-12 shows the four twisted-pair, straight-through cable schematics.
When connecting the ports to 10BASE-T- and 100BASE-TX devices, such as switches or repeaters, you can use a two or four twisted-pair, crossover cable. Figure B-11 shows the two twisted-pair, crossover cable schematics. Figure B-13 shows the four twisted-pair, crossover cable schematics.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T devices. You must use Category 5 cabling when connecting to 100BASE-TX devices.
When connecting the ports to 1000BASE-T 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-14 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-15 shows the crossover cable schematics.
|
Note Be sure to use a four twisted-pair, Category 5 cable when connecting to a 1000BASE-T device. |
The LRE port uses a single 50-pin RJ-21 connector, as shown in Figure B-3. Each LRE port uses two pins. Because the Catalyst 2950ST-24 LRE and Catalyst 2950ST-24 LRE 997 switches use 48 pins, pin 25 on the top row and pin 50 on the bottom row are not used
The Catalyst 2950ST-8 LRE switch uses 16 pins. Pins 9 through 25 on the top row and pins 34 through 50 on the bottom row are not used.
The 100BASE-FX and 1000BASE-SX ports use MT-RJ connectors, shown in Figure B-4. These ports use 50/125- or 62.5/125-micron multimode fiber-optic cabling.
You can connect a 100BASE-FX or 1000BASE-SX 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 3-1. Use the Cisco part numbers in Table 3-1 to order the patch cables that you need.
1000BASE-X Gigabit Interface Converter (GBIC) module ports use duplex SC connectors, as shown in Figure B-5.
The 1000BASE-T GBIC module port uses one RJ-45 connector, as shown in Figure B-2.
The GigaStack GBIC module ports use proprietary connectors, as shown in Figure B-6. The GigaStack GBIC cables are proprietary, high-data-rate cables with enhanced signal integrity and EMI protection.
 |
Caution Do not use standard IEEE 1394 cables with the GigaStack GBIC. |
The Catalyst 2950 LRE switch uses SFP modules for fiber-optic and copper uplink ports. Refer to the Catalyst 2950 LRE switch release notes for a list of supported SFP modules. See Figure B-7 and Figure B-8.
 |
Warning Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. |
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-DB-9 adapter cable. 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-3 and Table B-4.
You can identify a crossover 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-9.)
These sections describe the cables and adapters used with Catalyst 2950 switches.
Figure B-10 and Figure B-11 show the schematics of two twisted-pair cables for 10/100 ports.
Figure B-12 and Figure B-13 show the schematics of four twisted-pair cables for 10/100 ports.
Figure B-14 and Figure B-15 show the schematics of four twisted-pair cables for 10/100/1000 ports on Catalyst 2950T-24 switches, Catalyst 2950 LRE switches, and 1000BASE-T GBIC module ports.
Table B-1 lists the RJ-21 cable pinouts on the Catalyst 2950ST-24 LRE and Catalyst 2950ST-24 LRE 997 switches.
Table B-1 Catalyst 2950ST-24 LRE and Catalyst 2950ST-24 LRE 997 Switch RJ-21 Cable Pinouts
|
Table B-2 lists the RJ-21 cable pinouts on the Catalyst 2950ST-8 LRE switches.
Table B-3 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
Table B-3 Console Port Signaling and RJ-45-to-DB-9 Adapter Cabling
|
||||||||||||||||||||||||||||||||||||||||
Table B-4 lists the pinouts for the console port, RJ-45-to-DB-25 female DTE adapter, and the console device.
|
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-4 Console Port Signaling and Cabling Using a DB-25 Adapter
|
||||||||||||||||||||||||||||||||||||||||||||||||||
Posted: Thu Oct 23 00:35:34 PDT 2003
All contents are Copyright © 1992--2003 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.
