AT&T Bell System Plant Series Operation And Maintenance Manual

1
BELL SYSTEM PRACTICES
Plant Series
. €.ASE NOTE AND
RE.'TUIItN:
BURN~.
J. ·:- .........
.0...................... STATION DIALS
DIIJI!'iS, ' ..........
Q .................... .
JACK
?c-;·..:. ' . :· ........
t::?.....................
66-TYPE
KLAISS,
rv:.
J ..............
0 .......... ., ... _.
SECTION 501-164-123
Issue 1, November, 1965
AT&TCo Standard
PERRIN, A. EJ ............
O. . .
..J.D..!;.N.!IFICATION, OPERATION, AND MAINTENANCE
1.
GENERAL
1.01
The 66-type dial has sixteen pushbuttons;
ten used in "number-letter" dialing and
six used to provide special service features.
1.02
The 16 pushbuttons and multifrequency
oscillator are a unit. Flat tabs extending
from each side of the unit provide
f!"
~iii
ties for
mounting the dial in the associated telephone
sets.
1.03
Photos of dials used in this section are of
shop models, production units may differ
slightly.
2. IDENTIFICATION
66A3A DIAL
2.01
The 66A3A dial (Fig. 1) is initially in-
tended for use in the 3568HT-, 3640A1A-,
and 3641A1A-type telephone sets for the Auto-
matic Voice Network (AUTOVON) project.
Fig. 1 - 66A3A Dial - Front View
2.02
The 66A3A dial may also be used in a
standard telephone set circuit using a
425E or equivalent network. The necessary
switching for use with speakerphone is provided.
Eleven spade-tipped leads extend from the dial to
connect to telephone set terminals.
2.03
The six special service buttons have snap-
on caps which may be removed and re-
placed with caps having other designations.
2.04
The right-hand row of pushbuttons are
red. All other pushbuttons, including the
"A" and "star
'k"
special service buttons, are
medium gray.
66A4B DIAL
2.05
The 66A4B dial (Fig. 2) is initially in-
tended for use in telephone sets in the
AUTOVON project where a lighted dial is de-
Fig. 2 - 66A4B Dial - Front View
©American Telephone and Telegraph Company, 1965
Printed in U.S.A.
Page 1