Specifications

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System Wiring Connections

5.1. Telephone System Connections

The PCMTIM module is the telephone interface module for the PCM Paging Control System. The PCMTIM provides

the telephone interface (including talk battery), night ringer input, emergency over ride input, and auxiliary relay

contacts for the system. The module is also responsible for all tone signaling features.

The PCM connects to virtually any telephone system: PBX station lines and CO lines, PBX loop start trunk ports,

PBX ground start trunk ports, and page ports (using contact closure).

Interface installation consists of setting dip switches and connecting with modular (RJ11) telephone plugs.

Refer to the appropriate procedure in this section to connect the PCM System to the telephone system.

Note: In all cases, make sure that power to the PCM is off and any amplifiers being connected to it before performing

the installation.

5.2. PBX Loop Start Trunk Port

In this configuration, the unit supplies a 48V talk battery and loop current detection. When the unit detects a loop

resistance between Tip and Ring, it activates. When the loop opens, the page ends. The unit follows the status of the

trunk port; default and VOX timers are not used in this mode.

1. Make sure that power is off and all connections completed before proceeding.

2. Move the dip switches on the module to the position shown in Figure 5-1 below. Use the tip of a pen or other

pointed instrument to move the switches.

Figure 5-1: Loop Start Telephone

Selector Switch

3. Use a modular telephone cord to connect the module to the phone system. Plug one end of the cord into the Loop

Start Trunk (using a modular jack) and the other end in to the TEL LINE jack on the module.

The center two conductors are Tip and Ring (48V DC) and have a specific polarity. If the polarity of the trunk is

opposite, you can use a reversing modular cord to make the connection or reverse the connection through a modular

block. Refer to Figure 5-2 for more information.

Figure 5-2: Loop Start/Ground Start RJ11

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