BELL SYSTEM PRACTICES
AT& TCo Standard
SECTION
512-700-100
Issue
5,
April
1979
4A SPEAKERPHONE COMPONENTS
IDENTIFICA liON, INST ALLA liON, OPERA liON, AND MAINTENANCE
1.
GENERAL
1.01
This section contains information for the 4A
speakerphone system.
1.02
This section is reissued to:
•
Show 680A and 680AD transmitters M D
•
Add information o n 680AE transmitter
•
Add safety information for the 85Bl power
unit
Since this reissue covers a general revision, arrows
ordinarily used to indicate changes have been
omitted.
2.
IDENTIFICATION
2.01
The 4A speakerphone system is a hands-fr-ee
voice switching system for use as a telephone
adjunct and is a replacement for the 3-type
speakerphone system which is manufacture discontinued
(MD).
2.02
The 4A speakerphone system consists of a
transmitter, loudspeaker set, power unit,
and either a connecting block or adapter that when
connected to a suitable telephone set, provides:
•
Hands-free telephone operation
•
On-hook dialing (when dial is not obstructed)
•
Automatic switching from speakerphone to
handset operation
•
Transmitter cutoff for private conversation
•
Visual indication when system is in use
•
Cutoff common ringer or other signaling
devices when desired.
2.03
Components of the 4A speakerphone system
are shown in Fig. 3.
2.04
This system may be used with the lA, lAl,
or 1A2 key telephone systems and all PBXs.
2.05
For additional schematic and circuit information
refer to SO- and CD-69909-01, respectively.
A. Ordering Guide
2.06
Components which make up the various
arrangements of the 4A speakerphone system
are ordered separately as follows:
•
Set, Loudspeaker, 108AA-* (includes 7-foot
D20N mounting cord)
•
Transmitter, 680AE-* (includes 7-foot, D8S
mounting cord)
•
Transmitter, 680AE14-* (same as 680AE
except includes 14-foot D8S mounting cord)
•
Unit, Control 80B-49t (one required for each
4-wire or combination of 2-wire/4-wire station
equipped with 4A speakerphone)
•
Unit, Power, 85Bl-49
•
Block, Connecting, 82B-49t
•
Adapter, 223C-49t
•
Adapter, 223D-49t
*Add color suffix; refer to paragraph 2.08.
tOnly one of these four components required
per installation, depending on telephone set
type.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
BSP 512-700-100-i05_1979..04-0l.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Feb 16, 2012 23:01:06
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