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This appendix describes the Catalyst 3550 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 3550 switches.
The 10/100 and 10/100/1000 Ethernet ports on Catalyst 3550 switches use standard RJ-45 connectors and Ethernet pinouts with internal crossovers. Figure B-2 and Figure B-1 show the pinouts.
The 100BASE-FX ports use MT-RJ connectors, as shown in Figure B-3. 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 console port uses an 8-pin RJ-45 connector, described in Table B-2 and Table B-3. The supplied RJ-45-to-DB-9 adapter cable is used to connect the console port of the switch to a console PC. For console port and adapter pinout information, see Table B-2 and Table B-3.
These sections describe the cables and adapters used with the Catalyst 3550 switches.
Figure B-4 and Figure B-5 show the schematics of two twisted-pair cables for ports running 10 Mbps traffic.
Figure B-6 and Figure B-7 show the schematics of four twisted-pair cables for ports running 10 or 100 Mbps traffic.
For inline power connections, signal pairs are used to provide inline power. Nominally, there is 48 V between the pin pairs (1-2), and pairs (3-6) when inline power is active.
Figure B-8 and Figure B-9 show the schematics of four twisted-pair cables for ports running 1000 Mbps traffic.
This section describes how to identify a rollover cable (used to connect to the console port) and also describes the adapter pinouts.
To identify a rollover 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-10.)
Table B-2 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
Table B-2 Console Port Signaling Using a DB-9 Adapter
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Table B-3 lists the pinouts for the console port, RJ-45-to-DB-25 female DTE adapter, and the console device. 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-3 Console Port Signaling Using a DB-25 Adapter
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Posted: Mon Feb 9 08:58:21 PST 2004
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