Cisco 2950 Hardware Installation Guide - Page 100

/100/1000 Ports, Connecting to 10BASE-T and 100BASE-TX Devices, B-2, SFP Module Slots

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Connector Specifications Appendix B Connectors and Cables Note Use a straight-through cable to connect two ports only when one port is designated with an X. Use a crossover cable to connect two ports when both ports are designated with an X or when both ports do not have an X. Figure B-1 10/100 RJ-45 Pinouts Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC 12345678 H5318 10/100/1000 Ports 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 on page 1-11 for more information on LRE uplink logical ports. Connecting to 10BASE-T and 100BASE-TX Devices 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. Catalyst 2950 Switch Hardware Installation Guide B-2 OL-6156-01

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B-2
Catalyst 2950 Switch Hardware Installation Guide
OL-6156-01
Appendix B
Connectors and Cables
Connector Specifications
Note
Use a straight-through cable to connect two ports only when one port is designated with an
X
. Use a
crossover cable to connect two ports when both ports are designated with an
X
or when both ports do
not have an
X
.
Figure B-1
10/100 RJ-45 Pinouts
10/100/1000 Ports
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 on page 1-11
for more information on LRE uplink logical ports.
Connecting to 10BASE-T and 100BASE-TX Devices
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.
H5318
23
1
45678
Pin
Label
1
2
3
4
5
6
7
8
RD+
RD-
TD+
NC
NC
TD-
NC
NC