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Bell System Practices 43B Installation, Operation And Maintenance Manual

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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.
Page 1

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This manual is also suitable for:

53b