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Chapter 14 Installing optional telephony equipment 209
Installation and Maintenance Guide
2 Connect the paging system relay to the Page relay output on the MSC.
Refer to Figure 83.
External music source
(customer supplied)
You can use any approved low-power device as a music source. This would include equipment
such as a radio with a high impedance earphone jack, as a music source.
Music on hold specifications
Ensure that the music source follows these guidelines.
• Nominal input impedance is 3.3 kilohms.
• Nominal sensitivity of this interface returned to digital encoded PCM is
-22 dBm0 for a 0.25 V rms input signal.
• The input is limited so that the encoded analog content at the digital interface to the network
does not exceed -12 dBm when averaged over any three-second interval.
• The maximum non-clipped input level is 1 V rms.
• The interface is protected against ringing cross.
Figure 83 Page relay jack
Page relay jack MSC faceplate
Tip: Page relay output
Ring: Page relay output
Sleeve: Ground
Warning: The paging connections must not be connected to exposed plant.
Tip: Paging tips
Business Communications Manager external paging does not support talk back paging
equipment unless you use an external line port.
The Business Communications Manager system provides paging over the telephone
speakers when there is no external paging equipment.
Tip
Ring
Sleeve
Page relay