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Chapter 14 Install Optional Telephony Equipment 289
Installation and Maintenance Guide
Figure 186 Page relay jack
3 This procedure is complete.
Connect an external music source
Use this procedure to connect the external music source to the Business Communications Manager
jack. You can use any customer-supplied approved low power device as a music source. A music
source includes 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.
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 jack
Tip: Page relay output
Ring: Page relay output
Sleeve: Ground
Page relay
MSC Faceplate