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This appendix describes the Catalyst 2970 switch ports and the cables and adapters that you use to connect the switch to other devices.
These sections describe the connectors used with the Catalyst 2970 switch.
The 10/100/1000 Ethernet ports on the Catalyst 2970 switch use standard RJ-45 connectors. Figure B-1 shows the pinout.
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Note On switches running Cisco IOS Release 12.1(14)EA1 or later, you can use the
mdix auto command in the CLI to enable the automatic crossover feature. When
the automatic crossover feature is enabled, the switch detects the required cable
type for copper Ethernet connections and configures the interfaces accordingly.
Therefore, you can use either a crossover or a straight-through cable for
connections to a copper 10/100/1000 port on the switch, regardless the type of
device on the other end of the connection. The automatic crossover feature is disabled by default. For configuration information for this feature, refer to the switch software configuration guide or the switch command reference. |
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 and 100BASE-TX. Figure B-4 shows the two twisted-pair, straight-through cable schematics. Figure B-6 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-5 shows the two twisted-pair, crossover cable schematics. Figure B-7 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 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-6 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-7 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. |
The Catalyst 2970 switch uses SFP modules for fiber-optic and copper uplink ports. Refer to the Catalyst 2970 release notes for a list of supported SFP modules.
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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, which is described in Table B-1 and Table B-2. The supplied RJ-45-to-DB-9 adapter cable is 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-1 and Table B-2.
These sections describe the cables and adapters used with Catalyst 2970 switches.
Figure B-4 and Figure B-5 show the schematics of two twisted-pair cables for connecting to 10BASE-T- and 100BASE-TX-compatible devices.
Figure B-6 and Figure B-7 show the schematics of four twisted-pair cables for 10/100/1000 ports on Catalyst 2970 switches.
This section describes how to identify a crossover cable and also describes the adapter pinouts.
To identify a crossover cable, compare 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-8.)
Table B-1 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
Table B-1 Console Port Signaling Using a DB-9 Adapter
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Table B-2 lists the pinouts for the console port, RJ-45-to-DB-25 female DTE adapter, and the console device.
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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=) containing this adapter from Cisco. |
Table B-2 Console Port Signaling Using a DB-25 Adapter
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Posted: Thu Aug 21 11:16:39 PDT 2003
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