176 Chapter 12 Installing optional telephony equipmentN0060612N0060612Activating auxiliary ringer programmingYou can activate the auxiliary ringer by setting auxiliary ring for specific external lines and BCMtelephones.Connecting the external paging systemYou can connect a customer-supplied external paging system to provide paging over externalloudspeakers.Ensure the paging system follows these guidelines:• The paging output from the MSC is 100 mV rms across an input impedance of 600 .• 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.• The page output uses the tip and ring terminals of the jack. The sleeve terminal of the jackconnects to ground. You must use a stereo plug to connect the page signal output.When you use the page signal output jack to connect an external paging amplifier, you also use thepage relay jack, which contains a floating relay contact pair. The system uses this jack to controlthe external paging amplifier.• The contact pair has a switch capacity of 50 mA (non-inductive) at 40 V (maximum). Youmust remove any inductive load on the output.• The page relay contacts connect to the tip and ring terminals of the jack. The sleeve terminal ofthe jack connects to ground. You must use a stereo plug to connect the page relay.To install an external paging system1 Use the installation instructions that came with the external paging hardware to install theexternal paging system.2 Connect the paging system audio input to the page output on the MSC. Refer to Figure 88.Figure 88 Audio input jack3 Connect the paging system relay to the page relay output on the MSC. Refer to Figure 89.Page outputMSC faceplateRing - Page signalTip - Page signalSleeve - Ground
