AT&T Bell System Plant Series Installation Manual

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BELL SYSTEM PRACTICES
Plant Series
SECTION 314-642-200
Issue 2, May 1969
AT&TCo Standard
250-KILOBIT WIDEBAND LOOP
1 TO 250 KHZ
WLR-4 REPEA YER.
INSTALLATION
CONTENTS PAGE
1. GENERAL .
2.
PRECAUTIONS
3. STUB CABLE TERMINAL CONNECTIONS
•.
3
4. REFERENCES .
4
1. GENERAL
1.01
The WLR-4 repeaters provide super
group-bandwidth amplification for 250-kHz
wideband data transmission loops. The repeaters
also provide continuously adjustable loss equalization
to postequalize the wideband loops over the 1- to
250-kHz band, and can be equipped for pilot-regulation
to compensate for temperature changes. A completely
equipped 2-way repeater requires ten plug-in units:
a regulator, a preamplifier, an amplifier, a control
unit or plug, and a power selector, for both
directions of transmission.
1 .02
This section is reissued to correctly identify
Figures 3 and 4 and make minor corrections
to 3.01.
1.03
Two enclosures are provided for the WLR-4
repeater for use in the outside plant, a
KS-14296 L5 cabinet (Fig. 1), which is part of a
J70171A pole-mounted cabinet and holds up to
seven repeaters; and a 470A apparatus case. (Fig. 2),
which is part of a J70171B apparatus case for
manhole or pole mounting and holds one repeater.
1.04
Furnished as a part of the J70171A cabinet
is a 25-foot stub cable consisting of 54 pairs
of 22-gauge conductors in a steel armor over alpeth
with an outer polyethylene jacket, connected to a
gastight terminal block. This terminal block contains
carbon protector blocks for each stub cable pair.
Seven· repeater shelves are mounted in the cabinet
and are wired to a 329A terminal strip. After
the stub cable has been spliced in, cross connections
may be made to the repeaters, as required, by
strapping between the stub cable terminal blocks
and the repeater terminal strip.
1 .05
The watertight J70171B apparatus case is
used to enclose the repeater for pole or
manhole locations. Furnished as part of the
apparatus case is a 25-foot length of CA1984 stub
cable consisting of 16 pairs of 24-gauge polyvinyl-chloride
(PVC) insulated wires in a PVC jacket, covered
with a lead shield. Five pairs of the stub cable
and the repeater equipment are terminated on a
terminal block containing carbon protector blocks.
1.06
Additional installation information can be
found in the references listed in Part 4.
2. PRECAUTIONS
2.01
Since the 470A apparatus case is pressurized
and the KS-14296 L5 cabinet is not pressurized,
2.02 through 2.05
will
apply only to the 470A
apparatus case.
2.02
Always relieve the pressure on the apparatus
case before loosening the V-band clamp
preparatory to removing the container.
Note: The clamp and chain assembly is a
restraining device to prevent the container
from being blown off if the V-band clamp
should be accidentally loosened before the
apparatus case pressure has been properly
reduced. It should always be in place when
the apparatus case is pressurized.
©
American Telephone and Telegraph Company, 1969
Printed in U. S. A.
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