Catalyst 6500 Series Switches Installation Guide - Ipland

Appendix B
Transceivers, Module Connectors, and Cable Specifications
Module Connectors
RJ-21 Connector
The RJ-21 connectors (shown in Figure B-14) are used on telco modules. Each RJ-21 connector has pins
for 12 ports.
Note
The RJ-21 connector for the WS-X6624-FXS module has pins for 24 ports. See the “RJ-21 Connector
(WS-X6624-FXS Only)” section on page B-27.
Warning
If the symbol of suitability with an overlaid cross appears above a port, you must not connect the
port to a public network that follows the European Union standards. Connecting the port to this type
of public network can cause severe personal injury or can damage the unit. Statement 1031
To connect to 10/100BASE-TX RJ-21 telco interfaces, use Category 5 UTP cables with male RJ-21
connectors, as shown in Figure B-14. The WS-X6224-FXS analog interface module also uses an RJ-21
connector, but the pinout arrangement is different than the 10/100BASE-TX.
Figure B-14
RJ-21 Telco Interface Cable Connectors
RJ-21 port
90 RJ-21
connector
180 RJ-21
connector
110 RJ-21
connector
48136
Table B-23 lists the output signals for the RJ-21 telco connector. The receive and transmit signals are
polarized. One pin of each signal pair carries the positive (+) signal, and the other pin carries the negative
(–) signal.
Note
Table B-23 lists the output signals for the RJ-21 telco connector, not the pinouts of the cable connecting
to the module.
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Catalyst 6500 Series Switches Installation Guide
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