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General Description
This chapter provides a general description of the Power and
Termination Unit and its two major components: the Power and
Terminating Board (PTB-E) and Optional Facilities Board (OFB-E). It
also includes PTB-E and OFB-E circuit block diagrams and a
description of all circuit blocks depicted in both diagrams.
The Power and Termination Unit (PTU) houses the Power and
Terminating Board (PTB-E) and Optional Facilities Board (OFB-E).
Refer to Illustration 2 - PTU.
The PTU is a wall-mounted plastic housing that contains:
.
exchange line terminations
.
system bus terminations
.
line protection circuitry
.
power-fail relay
.
system power regulation and reticulation.
An in-line, mains-operated plug-pack, supplied as part of the PTU,
supplies the PTU's AC power.
C O M M A N D E R - E
Chapter Two
Power and Termination Unit
PTU
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