B-11
Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-05
Appendix B Connectors and Cables
Cable and Adapter Specifications
Figure B-13 Four Twisted-Pair Crossover Cable Schematics for 10/100/1000 and
1000BASE-T GBIC Module Ports
RJ-21 Cable Pinouts
Table B-1
lists the RJ-21 cable pinouts on the Catalyst 2950ST-24 LRE and
Catalyst 2950ST-24 LRE 997 switches.
Table B-2
lists the RJ-21 cable pinouts on the Catalyst 2950ST-8 LRE switches.
1 TPO+
2 TPO-
3 TP1+
6 TP1-
1 TP0+
Switch
Switch
2 TP0-
3 TP1+
6 TP1-
4 TP2+
5 TP2-
7 TP3+
8 TP3-
4 TP2+
5 TP2-
7 TP3+
8 TP3-
65274
Table B-1
RJ-21 Cable Pinouts on the Catalyst 2950ST-24 LRE and
Catalyst 2950ST-24 LRE 997 Switches
Function
Pin
Pin
Function
Port 1 Tip
1
26
Port 1 Ring
Port 2 Tip
2
27
Port 2 Ring
Port 3 Tip
3
28
Port 3 Ring
Port 4 Tip
4
29
Port 4 Ring
Port 5 Tip
5
30
Port 5 Ring
Port 6 Tip
6
31
Port 6 Ring
Port 7 Tip
7
32
Port 7 Ring
Port 8 Tip
8
33
Port 8 Ring
Port 9 Tip
9
34
Port 9 Ring
