CAUTION:
All intercom lines must be terminated. Care must be taken not to
'"double-terminate" a line. All unused intercom lines must also be terminated.
The PS-232 provides terminations for each of its two channels. Clear-Com main stations and power
supplies provide switch-selectable termination networks on all intercom lines. It is up to the user to in-
sure that the terminations are set correctly. An unterminated line will cause excessive levels, possible
oscillation of line drivers, and severe unbalance of hybrid null networks. A line with double or multiple
terminations will cause low levels and severe unbalance of hybrid null circuits.
If the PS-232 is the only power supply in the system (no other power supplies or powered main stations
are in the system) the termination switch on each channel of the PS-232 should be switched to ON.
Simply toggle the rear-panel switch labeled TERM to the ON position. The termination switch should be
set to the OFF position
only
if the channel is terminated at another station.
Program Input (Rear Panel)
A TRS connector provides the main program input to the station. This input level is controlled by the
rear panel PROGRAM TRIM control adjacent to the PROGRAM INPUT connector. This control sets the
overall level for all the channels. The input accepts a balanced or unbalanced line-level audio signal
from -20 dBv to +10 dBv. The program can be fed to either or both of the intercom lines by using the
front panel toggle switches labeled PROGRAM ON/OFF. There is one of these switches for each
channel.
The pinout of the Program Input Connector is as follows:
Shield --- Ground (Shield)
Tip --- + Signal
Ring --- - Signal
Rack Mounting
The unit requires 1.75 inches (44 mm) (1RU) of rack space. It requires no additional free rack space
above or below it for ventilation. The station is 5.25 inches (133 mm) in depth and requires at least 2
1/2 inches clearance in the rear for connectors and cables. The single-piece front panel has integral
"rack ears". This adds stability and strength. Take care not to over tighten the rack mounting screws as
this can mar the front panel.
Clear-Com PS-232 Power Supply
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