Connecting an auxiliary ringer, Connecting an external paging system – Nortel Networks BCM50 User Manual
Page 110
110
Chapter 9 Connecting the cables to the BCM50 system
NN40020-302
Connecting an auxiliary ringer
An auxiliary ringer is a customer-supplied piece of hardware that provides external ringing
capability to telephones on the BCM50 system.
To install an auxiliary ringer
1
Use the installation instructions supplied with the ringer hardware to install the auxiliary
ringer.
2
Connect the ringer generator to the auxiliary ringer output pair on the RJ-21 telephony
connector. To determine which pair of wires to use for the auxiliary ringer, see
telephony connector wiring chart
3
Select the appropriate option for your system:
•
If you add more auxiliary equipment, proceed to
Connecting an external paging system
page 110 or
Connecting an external music source
•
When you finish adding auxiliary equipment, proceed to
Connecting an 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 main unit is 100 mV rms across an input impedance of 600
Ω.
•
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.
When you use the page signal output to connect an external paging amplifier, you also use the
page relay output that contains a floating relay contact pair. The system uses this output to control
the external paging amplifier.
•
The contact pair for the page relay output has a switch capacity of 50 mA (non inductive) at
40 V (maximum).
To install an external paging system
1
Use the installation instructions supplied with the external paging hardware to install the
external paging system.
2
Connect the paging system audio input to the page output on the RJ-21 telephony connector.
To determine which pair of wires to use for the page output, see
Warning: You must not connect auxiliary ringer to unprotected plant wiring.
The ringer must not draw more than 50 mA from a 40 V DC source.