Operation - Bell System Practices 831 Identification, Installation, Connections, And Maintenance

Fig. 5-lnstalling Spade-Tipped Handset Cards
the use of two pick-up buttons on the 647 A5C key
must be sacrificed (Table F).
To provide the maximum key features plus
3.04
the 3-type speakerphone feature install the
55-type control unit at the same location as the
telephone set and connect the speakerphone leads
to the telephone set using an auxiliary mounting
cord (see Fig. 7, option X).
If 4-type speakerphone is provided the 223A
3.05
adapter is used to interconnect the 4A
speakerphone system (680A transmitter, 108A
loudspeaker set, and 85B1 power unit).
For connections to the 3- or 4-type speakerphone
3.06
system, refer to the appropriate section
Division 512.
When adding speakerphone to 831-type
3.07
telephone sets; the 8R dial must be replaced
by an 8C dial (order separately) to provide the
additional off-normal contacts required for speakerphone
connection.
The 831C and 2831C telephone set bases are
3.06
equipped with a KS-2041911 (10 volt AC
only) buzzer mounted on the basepan on the left-hand
side of dial (Fig. 6) .• The buzzer leads are connected
(0-Y) (Y-0)
to and
503-702·101-106_1974-02-0S.jpg Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado
BSP
mounting cord leads.
screw grommets and mounting screws are provided
to install a KS-810912 buzzer, if required.
831A1M (MD) and 2831A1M (MD) telephone sets
are not factory equipped with a buzzer but either
type buzzer may be ordered and installed separately.
Polarity Guard (2831-type only)
3.09
used only when specified by local instructions
for end-to-end signaling installations where battery
and ground reversals may be encountered.
P-90D170 polarity guard assembly may be installed
on the right key bracket (Fig. 8) with screw
provided. Connections for polarity guard assembly
are shown in Table D.
STATION BUSY LAMP CONNECTIONS
LEAD
Hold Key
(G·W)
KS·l5724Ll
Diode
(Ordered
Separately)
Mtg Cord (Y-O)
(Note)
0
831C, 2831C;831CT (MD), 283JCT (MD); 831BlM
(MD), 2831 BlM (MD); and 831A1M (MD),
2831A1M (MD) early version
Q
831AlM (MD) or 2831A1M (MD) early version
Note: Use spare mounting cord lead if (Y-O) lead is
used io provide other options.
Operational tests of all features should be
3.10
made to insure proper operation and customer
satisfaction.
Where conditions warrant, •G3A6 or• G 12A
3.11
handset can be replaced with other types
as follows:
Plastic For impaired hearing-G6-type
•
Feb 04,2012 16:47:46
ISS 6, SECTION 503-702-101
should be
TABLE B

OPERATION

Remove from terminal 22 and
connecl to 16
Connect as shown
16
IT!]
@
Remove from
connect to 22
Page 5
The
A
22