Nortel Networks 400 4.0, BCM200 manual Connecting the external paging system

174Chapter 12 Installing optional telephony equipment

Activating auxiliary ringer programming

You can activate the auxiliary ringer by setting auxiliary ring for specific external lines and BCM telephones.

Connecting the external paging system

You can connect a customer-supplied external paging system to provide paging over external loudspeakers.

Ensure the paging system follows these guidelines:

• The paging output from the MSC is 100 mV rms across an input impedance of 600 .

•The output level is 0 dBm0 with reference to 600 ohms, for a PCM encoded signal at 0 dBm. There is no DC voltage across the page output terminals.

•The page output uses the tip and ring terminals of the jack. The sleeve terminal of the jack connects to ground. You must use a stereo plug to connect the page signal output.

When you use the page signal output jack to connect an external paging amplifier, you also use the page relay jack, which contains a floating relay contact pair. The system uses this jack to control the external paging amplifier.

•The contact pair has a switch capacity of 50 mA (non-inductive) at 40 V (maximum). You must remove any inductive load on the output.

•The page relay contacts connect to the tip and ring terminals of the jack. The sleeve terminal of the jack connects to ground. You must use a stereo plug to connect the page relay.

To install an external paging system

1Use the installation instructions that came with the external paging hardware to install the external paging system.

2Connect the paging system audio input to the page output on the MSC. Refer to Figure 87.

Figure 87 Audio input jack

Ring - Page signal MSC faceplate

Tip - Page signal

Page output

Sleeve - Ground

3Connect the paging system relay to the page relay output on the MSC. Refer to Figure 88.

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