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Power and Terminating
Board
Optional Facilities Board
(Optional)
Board Code - PTB-E
Location - PTU Base
Description - The PTB-E provides:
the system terminal strip
Used to terminate: incoming exchange lines; the system bus;
the power-fail station and external background music inputs.
.
power supply circuitry
.
exchange line protection.
Board Code - OFB-E
Location - PTU Cover
Board Description - An OFB-E is installed in the PTU when any of
the following optional facilities are required:
.
Door Station
.
external music-on-hold
.
background music
The OFB-E uses the same microcomputer as the keystations. It
contains: the intelligence required for bus communications, the control
features necessary for the optional facilities and the Door Station input
terminals. The OFB-E connects to the PTB-E via a flat cable.
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