2 4
SPK2000
US2000A
PS-L
PS-L
TERMINATION
PLUGS
4
SPK2000
US2000A
PS-L
PS-L
4
1
1
CH 1
CH 2
SPK2000
US2000A
PS-L
PS-L
4
1
1
TO ADDITIONAL
LOCALLY POWERED
INTERCOM STATIONS
Figure 13. An example of all locally powered US2000A intercom stations. In
this example, all components are locally powered using PS-L local power supplies.
Note the use of one termination plug in each intercom channel. (One termination
plug is supplied with each US2000A.) Only one termination plug should be installed
per channel. Typically, they are installed at the first intercom station in the chain. If
2 terminations are installed in a channel, the sound quality and volume level will be
noticeably reduced. IMPORTANT!: If a system power supply (SPS2000A, PS2000L
etc.) is ever connected anywhere in a channel, the termination plug should be
removed from that channel, because the system power supply already has built-in
termination.
The advantage of locally powered stations is that they can be operated over a
greater distance than is possible when using a system power supply.
Note: For further information about the cable numbers, see page
