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Description of Locally Powered Connection
Figure 5 illustrates an intercom system with both phantom powered and locally powered "U" boxes. As long as a system
power supply (PS2001L, SPS-2001, etc.) is located somewhere in the intercom system, the proper terminating impedance will
still be supplied for all stations. However, if all stations are locally powered, and there is not system power supply, a special
line termination must be installed.
A two-channel Audiocom intercom system using a PS2001L power supply. The PS2001L is set to isolate mode.
FIGURE 5.
In isolate mode, each intercom channel is a separate party line, and total current for each channel is limited to 1 amp. Note,
both SS-1002 and SS-2002 stations may be connected depending on each location's need to communicate with one or two
channels. SS-1002 stations may be connected to either channel one or two. Also, note that locally powered stations may be
connected. This is recommended when stations are installed at remote locations. Since the PS2001L provides termination
for the intercom channels, no user-installed termination is required.
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