Connecting an external music source – Nortel Networks BCM50 User Manual
Page 111
Chapter 9 Connecting the cables to the BCM50 system
111
Installation and Maintenance Guide
3
Connect the paging system relay to the page relay output on the RJ-21 telephony connector. To
determine which pair of wires to use for the page relay output, see
4
Select the appropriate option for your system:
•
If you add more auxiliary equipment, proceed to
Connecting an external music source
page 111 or
Connecting an auxiliary ringer
•
When you finish adding auxiliary equipment, proceed to
Connecting an external music source
Use this procedure to connect an external music source to the BCM50 system. 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.
For information about connecting an external music source:
•
•
To connect the music source using the music source jack
•
To connect the music source using the RJ-21 telephony connector
Music source 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: You must connect the paging connections to unprotected telephony plant
wiring.
Tip: Paging tips
External paging does not support talk back paging equipment unless you use an
external line port.
The BCM50 system provides paging over the telephone speakers when no external
paging equipment is available.