To Install An Auxiliary Ringer; To Install An External Paging System; Connecting An Auxiliary Ringer; Connecting An External Paging System - Nortel BCM50 3.0 Installation And Maintenance Manual

114 Chapter 9 Connecting the cables to the BCM50 system

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
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.
3 Select the appropriate option for your system:
• If you add more auxiliary equipment, proceed to
page 114 or
• 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
wiring chart
NN40020-302
on page 207.
Connecting an external music source
on page 207.
Connecting an external paging system
on page 115.
Next step on page 118.
RJ-21 telephony connector
RJ-21
on