Specifications

Intercom Channel Connections

IMPORTANT: The following paragraphs and illustrations describe installation

of the WM1000/2000 in and Audiocom Intercom System.

General Information

The WM1000/2000 mounts in a standard two-gang electrical box. Some example

intercom system configurations are shown in Figure 2 through Figure 5. Detailed

connections for the WM1000/2000 are shown in Figures 6 and 7. There are two (2)

basic methods for connecting the WM1000/2000:

• use phantom powered connection

• use local power

NOTE: After connecting intercom stations as described below, and before

installing the mounting screws, connect a headset and perform the

sidetone adjustment as described on page 10.

Method 1: Phantom Powered Connection

In this method, operating power and intercom audio are delivered to the

WM1000/2000 over the same wires. The advantage of this setup is simplicity of

connection. Also, the Audiocom power supply automatically provides terminating

impedance for the intercom system. Without this terminating impedance, the sound

quality on the channel is distorted, and the levels shift each time additional stations

are connected to the channel. The disadvantage of the phantom power method is that

some operating power is lost over very long intercom cables, and performance is then

reduced at remotely located stations. Generally, if the intercom stations are located

within a few hundred feet of the power supply, the phantom power is sufficient. The

actual distance over which power is delivered can vary, however, depending on the

number of stations connected. Increasing the number of stations reduces the distance.

NOTE: The range over which power can be delivered is independent from the

range over which audio can be sent. Audio can be transmitted for several

miles, providing that intercom stations are locally powered, see “Method

2: Locally Powered Connection.

Method 2: Locally Powered Connection

Using this method, the intercom station is connected to the intercom line just like any

phantom-powered intercom station, except that a local power supply is also

connected. This local power supply is located with the intercom station and provides

power for that station only. Since power loss on the intercom lines is no longer an

93507621000 WM10002000UserManual.book Page 8 Monday, April 27, 2009 3:09 PM