Nortel Networks BCM1000 manual External paging system, Connecting the paging system

158 Chapter 13 Installing optional telephony equipment

External paging system

(customer supplied)

You can connect an 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 Ω.

•The output level is 0 dBm with reference to 600 Ω, 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.

Connecting the paging system

Install the external paging system using the installation instructions that came with the paging system.

1Connect the paging system audio input to the Page output on the MSC. Refer to Figure 66.

Figure 66 Audio input jack

Audio input jack		MSC faceplate
		Ring
		Tip
		Sleeve
Tip:	Page signal	Page output
Ring:	Page signal
Sleeve: Ground

P0609324 01