INSTALLATION
OUTPUT terminals 2 and C for 90-
volt ringing signals).
a. Mounting. Select a location to mount the
(3) Thread the two output wires through
TA-248/TT or TA-248A/TT on a wall near the
the left rubber grommet on the bot-
equipment with which it is to be used (fig.
tom of the mounting base
(4) Connect the other ends of the output
is Sufficiently high to assure that personnel do
wire pair to the appropriate termi-
not accidentally disturb the operation of the
nals of the associated equipment.
TA-248/TT or TA-248A/TT by coming in con-
tact with it. Mount the TA-248/TT or TA-
(5) Remove the mounting strip below
248A/TT as fallows:
transformer T1 to expose the
INPUT terminal lugs.
(1) Position the TA-248/TT or TA-248A-
(6) Connect a pair of No. 18 AWG strand-
TT at the selected location on the wall.
ed wires of proper length to the IN-
(2) Insert a No. 8 roundhead screw (ei-
PUT terminal lugs.
ther 1-inch or 1-1/2 inch, depending
(7) Thread the two input wires through
on the wall thickness) into one of
the right rubber grommet on the
the holes in the mounting bracket.
bottom of the mounting base.
Tighten the screw to secure the unit
to the wall.
(8) Connect the other ends of the input
(3) Repeat the procedure given in (2)
wires to an appropriate ac power
above for each of the other mounting
connector or receptacle.
screws. Tighten each of the mounting
b. TA-248/TT (fig. 1-1). To connect the TA-
screws (located at the top and bottom
248/TT for operation, follow the procedures in
of the mounting base) until the base
steps (1) through (3) below.
is seated securely against the wall.
(1) Perform the procedures given in b
2-2. Connections
(1) through (7) above.
(2) Connect the other ends of the INPUT
TA-248A/TT for operation, follow the pro-
wires to the left sides of fuses F1 and
cedures in steps (1) through (8) below.
F2 on the fuse block located on the
rear of the adapter mounting panel.
(1) Remove the cover from the housing
of the TA-248A/TT.
(3) Connect a pair of No. 18 AWG strand-
ed wires of the proper lengths from
(2) Connect a pair of No. 18 AWG strand-
the right sides of fuses F1 and F2 on
ed wires (Federal Stock No. 6145-160-
the fuse bock to an appropriate ac
6212) of proper length to the OUT-
power connector or receptacle.
PUT terminals on the panel. (Use
