All Locally Powered Intercom Stations (Dry Lines)
If intercom stations are widely distributed, you can dispense with a system power supply (PS2001L, SPS-2001, etc.) and use local power for each station. When no power is delivered on the intercom channels, this is known as dry-line operation. Since a system power supply is not used, a line termination must be inserted in each intercom channel for proper operation. Again, note that only the “U” box has provisions for local power. The 3-pin connectors on the “S”, “P”, and RM versions do not permit this type of connection. Figure 7 illustrates an intercom system using all locally powered “U” boxes.
Figure 7 - An example of an Audicom intercom system using all locally powered “U” box stations, with no power being distributed on the intercom channels (dry lines). Since an Audiocom power supply is not used, the installer must connect a line termination somewhere in each channel for proper operation.
Figure 8 - Audiocom mode line termination for dry-line operation. (One required for each channel). the termination is available via PN: 9020- 7550-000.
