41.
Technical characteristics:
Power requirement ...................................................................................................... 48 V DC
Power consumption:
Off-hook (Powered up) ............................................................................ 1.5 W (maximum)
On-hook (Powered down) .................................................................... 300 mW (maximum)
NSN: 5805-01-246-6826 (,572.00)
TM 11-5805-761-12
PART F - MULTIPLEXER TD-1233/TT AND
MULTIPLEXER-COMBINER TD-1234/TT
42. One terminal you might have to install prior to the installation of the telephone sets is a J-
1077A/U. This junction box has terminals inside for 26 pairs of wires. To connect a 4-wire telephone
you would connect the transmit wires to the odd terminals (1, 3, 5, 7, and so forth) and the receive pairs
to the even terminals (2, 4, 6, 8, and so forth). However, you do not want to split the installation. If you
are installing a telephone set TA-838( )/TT, you would put the transmit wires to terminals 1 and the
receive wires to terminals 2. Then the next telephone would go transmit to 3 and receive to 4. Do this
until you have installed 12 4-wire telephones. The other terminals are to be used by the installer for
troubleshooting or to replace a bad pair. The J-1077A/U is normally used with multiple subscriber
equipment. (See Figure 1-25.)
43. Another terminal or terminals you might have to install before installation of a telephone set are
the TD-1233/TT and the TD-1234/TT. These two pieces of equipment go with DGM equipment. (See
Figures 1-26, 1-27, 1-28, and 1-29 to view the equipment front and back. You must be familiar with
both sides.)
44.
Installation of TD-1233/TT or TD-1234/TT.
a. First we must discuss SAFETY (to the installer and to the equipment).
(1) Remove all jewelry, to include rings, watches, neck chains, and identification tags. Place
the jewelry in a pocket or another secure place. Failure to do so could cause severe burns or injury to
the installer.
(2) The equipment must be properly grounded prior to connecting power cables, transmission
cables, and telephone wires. Failure to do so could damage the equipment and very possibly jolt the
installer with an electrical shock.
1-29
SS0441
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