Cisco Catalyst 3550

B-1
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-01
APPENDIX
B
Connector and Cable Specifications
This appendix describes the Catalyst 3550 switch ports and the cables and
adapters that you use to connect the switch to other devices.
Connector Specifications
This section describes the connectors used with the Catalyst 3550 switch.
10/100/1000 Ports
The10/100/1000 Ethernet ports use RJ-45 connectors and Ethernet pinouts with
internal crossovers, as indicated 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 adapter can be attached to the port. Figure B-1 shows
the pinout.
When connecting the 10/100/1000 ports to compatible workstations, servers,
routers, and Cisco IP Phones, you must use a straight-through cable wired for
10BASE-T, 100BASE-TX or 1000BASE-T. Figure B-6 illustrates the
straight-through cable schematic. When connecting to other switches or repeaters,
ensure that you use a crossover cable. Figure B-5 illustrates the crossover cable
schematics.