Filter
Top Products
RJ-21 Port Connector and Cabling Specifications
27
Cisco Communication Media Module for Catalyst 6500 Series Switch and Cisco 7600 Series Router Installation and Verification Note
RJ-21 Port Connector and Cabling Specifications
Caution Do not connect the WS-SVC-CMM-24FXS port adapter directly to a voicemail server, IVR application,
or fax server if the servers have unused wiring pairs with voltage on them. We recommend that you
connect the 25-pair cables to punch-down blocks and cross connect to the voicemail, IVR, or fax servers.
If you do not use punch-down blocks and cross connects to the WS-SVC-CMM-24FXS port adapter, you
could damage the port adapter. For example, the FLT-8 card for the Octel 250 uses every other pair for
its voice ports. The unused pairs have +36 VDC across ring-to-ground in an on-hook condition, and this
high voltage has been known to damage the WS-SVC-CMM-24FXS port adapter.
Use a standard RJ-21 Category 5 telco connector and cable to connect to the RJ-21 connector. Two types
of RJ-21 connectors are shown in Figure 15 and Figure 16. A pinout for the module’s RJ-21 connector
is provided in Table 7.
Figure 15 RJ-21 Telco Interface 90-Degree Cable Connector
Figure 16 RJ-21 Telco Interface 180-Degree Cable Connector
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
11485
11486