INTRODUCTION
Section I. GENERAL
equipment manual by the individual user is
authorized and encouraged. DA Form 2028
This manual describes Static Ringing Gen-
will be used for reporting these improvements.
This form may be completed using pencil, pen,
T A - 2 4 8 A / T T (fig. 1-2 and 1-3) and con-
or typewriter. DA Forms 2028 will be com-
tains installation, operation, and maintenance
pleted by the individual using the manual and
instructions. A basic issue items list is pro-
forwarded direct to Commanding General,
U. S. Army Electronic Command, ATTN:
AMSEL-MR-(NMP)-MA, Form Monmouth,
parts and special tool lists are provided in
New Jersey 07703.
1-3. Index of
Equipment publications
a. Reports of Maintenance and Unsatisfac-
Refer to the latest issue of DA Pam 310-4 to
tory Equipmentent. Use equipment forms and
determine whether there are new editions,
records in accordance with the instructions
changes, or additional publications pertaining
in TM 38-750.
to the equipment. Department of the Army
b. Report of Damaged or Improper Shipment.
Pamphlet No. 310-4 is an index of current tech-
Fill out and forward DD Form 6 (Report of
nical manuals, technical bulletins, supply
Damaged or Improper Shipment) as prescribed
manuals (types 7, 8, and 9), supply bulletins,
in AR 700-58 (Army), NAVSANDA Publica-
lubrication orders, and modification work
tion 378 (Navy), and AFR 71-4 (Air Force).
orders available through supply channels. The
c. Reporting of Equipment Manual Improve-
index lists the individual parts (-10, -20, -35P,
ments. The direct reporting of errors, omis-
etc. ) and the latest changes to and revisions
sions, and recommendations for improving this
of each equipment publication.
Section II. DESCRIPTION AND DATA
1-5.Description
a.
Static Ringing
TA-248A/TT are the vibrating-reed type of fre-
(fig. 1-1 and
1-2). The
TA-248/TT is
inclosed
in a cast-aluminum housing 10 inches long,
power at 90 volts and 20 cycles per second
4-3/8 inches wide, and 4-1/8 inches deep, and
weighs 7-1/2 pounds. The housing consists
(cps) alternating current (at) to ringing equip-
ment from a 110- to 115-volt ac, 60-cps power
of a removable cover and mounting base. The
source in the telephone central office equip-
base can be mounted on an adapter plate. The
ment installation. The TA-248/TT and TA-
two 5-ampere cartridge fuses are mounted on
a fuse block on the rear of the adapter mount-
248A/TT are used in telephone central office
equipment; however, in some applications, the
ing plate. Two holes, one for inserting the in-
units are furnished independently and can be
put leads and the other for the output leads,
mounted on a wall a short distance from the
The
are located at the bottom of the base.
equipment with which the unit is to be used.