Bell System Practices 830 Connections

BELL SYSTEM PRACTICES
AT& TCo Standard
1. GENERAL
1.01 This section contains information necessary
to connect the 830-, 831-, 2830-, or 2831-type
telephone set to provide speakerphone service.
Refer to Section 512-700-100 for detailed information
on components of the 4A speakerphone system.
1.02 This section is reissued to:
•
Add safety information for the 85B1 power
unit
•
Show 223A adapter and M16C cord MD
•
Add 223D adapter and M16H cord
•
Add 108AA loudspeaker set
•
Add 841050818 retaining clamp.
1.03 Rotary telephone sets equipped with an
BRA dial must be equipped with an 8CA dial
when used with 4A speakerphone.
of off-normal contacts on 8CA dial shall connect to
the same terminals as P3 and P4 leads from the
speakerphone.
2. CONNECTIONS
A. 223-Type Adapter
The cords from the 108-type loudspeaker
2.01
set, 680-type transmitter, and 85B1 power
unit are installed in the proper receptacles of the
223A •(MD) or 223D• adapter.
be fastened securely to assure proper mating of
connectors.
2.02
Ringer Cutoff can be provided by connecting
ringer leads as shown in Fig. 2.
cutoff provides cut off of the telephone set ringer
Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado Feb 23,2012 22:43:33
BSP 512-740-470-i0 6_1979-09-Ql.j pg
830-, 831-, 2830-, AND 2831-TYPE TELEPHONE SETS
SPEAKERPHONE SYSTEM-4A
The second set
The cover must
Not for use or disclosure outside the
Bell System except under written agreement
CONNECTIONS
through the loudspeaker set relay contacts while
on speakerphone.
2.03 Due to insufficient mounting cord conductors
in the other sets, the auxiliary relay feature
can only be used in the 831DM, and 2831DM
(modular) telephone sets.
provides a contact closure for the operation of an
auxiliary relay key telephone unit when it is desired
to cut off several signals.
B. 108-Type Loudspeaker Set
2.04 Loudspeaker set and transmitter must be a
minimum of one foot apart.
C. 680-Type Transmitter
2.05 Transmitter must be at least two feet from
transformer or any ac powered device.
D.
858 1 Power Unit
2.06 Use an ac power outlet (not under control
of a switch) as close as possible to the system
being installed. A retaining clamp (841050818) will
be shipped with the 85B1 power unit and should
be mounted to the ac receptacle to hold power
unit securely to prevent accidental loss of power.
2.07 Power can be provided by making connections
as shown in Fig. 1 and 2.
2.08 The M2FG cord is furnished as part of the
•223A (MD) or 223D• adapter for connecting
the 85B1 power unit.
2.09 The 85Bl power unit should be located less
than 125 feet from 108-type loudspeaker set
when using 24 gauge wire •or Jess than 85 feet
Ringer when using 26 gauge wire..
512-700-100 for detailed power supply information.
NOTICE
P rinted in U.S.A.
SECTION 512-740-470
Issue 6, September 1979
The auxiliary feature
Refer to Section
Page 1