B-19
Catalyst 6500 Series Switches Installation Guide
OL-5781-04
Appendix B Transceivers, Module Connectors, and Cable Specifications
Module Connectors
Figure B-12 RJ-21 Telco Interface Cable Connectors
Table B-12 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-12 lists the output signals for the RJ-21 telco connector, not the pinouts of the cable connecting
to the module.
Caution Category 5e and Category 6 cables can store large levels of static electricity because of the dielectric
properties of the materials used in their construction. Always ground the cables (especially in new cable
runs) to a suitable and safe earth ground before connecting them to the module.
Caution To comply with GR-1089 intrabuilding, lightning immunity requirements, you must use foil-twisted pair
(FTP) cable that is properly grounded at both ends.
90
180
RJ-21 port
110
48136
RJ-21
RJ-21
RJ-21
connector
connector
connector
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