Bell System Practices 43B Installation, Operation And Maintenance Manual

BELL SYSTEM PRACTICES
AT&TCo Standard
43B AND 53B STATION DIALS
IDENTIFICATION, INSTALLATION,
1.
GENERAL
OPERATION,
CONNECTIONS,
1.01 This section contains information on the 43B
(MD) and 53B (ME) dials. These dials (Fig.
1 and 2) are capable of automatically dialing multiple
telephone numbers.
They consist primarily of a
dialing mechanism and a number programming
terminal board. This information should be retained
for existing installations only.
Fig. 1—43B (MD) Dial, Without 814775573 (P-47 G557)
Cover
SECTION 501-165-102
Issue 4, April 1979
AND MAINTENANCE
Fig. 2—53B (MD) Dialr Without 814775573 (P-47G557)
Cover
1.02 This section is reissued to:
Show the 43B dial and 53B dial (MD)
Add paragraph 4.0,5
Add comcode numbers.
1.03 These dials may be used with most standard
.,,
telephone sets.
However, one Isolated set
of normally open line switch contacts must be used
to provide a lock-up path between the dial and
NOTICE
Not for use or disclosure outside the
Ml System except under written wreement
Printed in U.S.A.
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