B-3
Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-05
Appendix B Connectors and Cables
Connector Specifications
Figure B-1 10/100 RJ-45 Pinouts
10/100/1000 Ports
The 10/100/1000 Ethernet ports on Catalyst 2950T-24 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 on page 2-14 for more information on LRE
uplink logical ports.
H5318
231 45678Pin Label
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RD+
RD-
TD+
NC
NC
TD-
NC
NC
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