Network Router User Manual

Catalyst 6500 Series Switch and Cisco 7600 Series Router CMM Installation and Verification Note

78-14107-07

RJ-21 Port Connector and Cabling Specifications

Caution Do not connect the WS-SVC-CMM-24 FXS 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-24 FXS 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-24 FXS 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 thatfollows theEuropean Unionstandards. Connecting the port to this type

of public network can cause severe personal injury or can damage the unit. Statement 1031

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