Bell System Com Key 416 Instruction manual

I
BELL SYSTEM PRACTICES
AT & TCo Standard
SECTION S18-450-1 06
Issue 3, January 1980
4A COMMUNICATION SYSTEM
(COM KEY* 416)
IDENTIFICATION, INSTALLATION, CONNECTION, OPERATION, AND MAINTENANCE
CUSTOMER EQUIPMENT
CONTENTS PAGE CONTENTS
PAGE
1. GENERAL
3 POWER REQUIREMENTS 21
2. IDENTIFICATION
7
Supplementary Power
22
BASIC FEATURES 7
CABLING RESTRICTIONS
23
OPTIONAL FEATURES 10
SYSTEM CABLING AND CONNECTIONS 24
TELEPHONE SETS 11
TELEPHONE SETS
24
PBX INTERFACE
12 A. Primary Sets
24
FCC REGISTRATION 12 B. Basic Satelli
te and HFAI
Desk Sets 24
ORDERING GUIDE
12
c. BIS Desk Sets
24
A. Telephone Sets 12 D.
Ba si c Satellite Wall Sets 25
B. Optional
Apparatus 15 E. BIS Wall Sets
28
c. Optional Components 16
F. HFAI Wall Sets
30
D. Interconnection Components 17 G.
All HFAI Sets
30
E. Replaceable Components 17
BASIC FEATURES
31
3. INSTALLATION AND CONNECTION
20
A.
CO / PBX and Intercom Li ne Assignments
(Primary Sets Only)
31
PLANNING
20
B.
CO /PBX
Ringing and
DSS Code
ELECTRICAL PROTECTION 21
Ass i gnments (All Sets)
31
ELECTRO - MAGNETIC INTERFERENCE
21
SUPPLEMENTARY POWER
32
OPTIONAL FEATURES
33
*Tradema rk of AT&T. A. Music-On-Hold
33
NOTICE
Not fo r use or disclosure outside the
Be ll System except under written agreement
Printed in U.S.A.
Page 1
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SECTION 518-450-1 06
CONTENTS PAGE
B. Tone-On-Hold
34
C. Paging (Telephone Company Provided
System) 36
D. Paging (Interface With Customer-Provided
System) 39
E. Power Failure Ringing
40
F. Supplementary Alerting Device Access
43
G. Preset Intercom Voice Signaling 45
H. Privacy 47
I. Station Dial Restriction
49
J. Personal Line
49
K. Code Busy DSS Key
54
L. 4A Speakerphone
54
M. Repertory Dialing 57
N. External Ringing
57
0. Special Handsets
58
FINAL SYSTEM CONNECTIONS
58
4. METHOD OF OPERATION
59
ANSWERING CALLS USING HANDSET 59
PLACING CALLS USING HANDSET
60
HOLD OPERATION
60
Page 2
CONTENTS
ANSWERING CALLS USING BUll T-IN
SPEAKERPHONE
PLACING CALLS USING BUILT-IN
PAGE
60
SPEAKERPHONE 61
Built-In Speakerphone Operating Features 61
ANSWERING INTERCOM CALLS AT HFAI
STATION 61
HFAI Operating Features
CALLING AN HFAI STATION
4A SPEAKERPHONE OPERATION
MISCELLANEOUS OPERATING TECHNIQUES
5. MAINTENANCE
DIAGNOSTIC
PROCEDURES
DISASSEMBLY AND ASSEMBLY OF TELEPHONE
SETS
A. Faceplate
B. Upper Housing
C. Lower Housing (All Satellite Desk Sets)
D. Wall Housing (All
Satellite Wall Sets)
E. Lower Housing (Primary Sets)
0:35:17
62
62
62
63
64
64
65
65
65
71
71
71

I
I
I
518
CONTENTS PAGE
REMOVAL AND INSTALLAT I ON OF
COMPONENTS 73
A.
DSS Key
74
B. Dial 75
C. Loudspeaker Asse mbly
78
D. Handset Jack
79
E. Recall Key
79
F. Loudspeaker Volume Control
80
G. Line Key
80
H. BIS Module 81
I. HFAI Modu le
81
J. Amplifier
82
K. Voice -Signaling In terf ace C irc uit
82
L. Interconnect Field A ss embly 83
M.
Ba se and Log ic A ss embly
84
N. Power Transformer 84
1.
GENERAL
1. 01 This section provides complete information
on the 4A Communication System (COM
KEY 416) using 98112981- and 983/2983-type
telephone sets.
1. 02 This secti on is reissu ed to:
• Add information relative to the Federal
CommunicationsCommission
(FCC) Registration
Program
ISS 3, SECT ION 518-4 50 -106
• Show the 91B connecting bl ock replacing
the
91A (MD)
• Show the 33C voice coupler replacing the
33A (MD)
• Show the 30AM apparatus unit replacing
the
30A (MD)
• Show the 19B4 power unit replacing the
19B2 (MD)
• Show the 2012D transformer replacing the
2012B (MD)
• Show the D-180980 music-on-hold kit of parts
replacing the D-180730 (MD)
• Delete coverage of F-60591 Kit of Parts
• Add information on electrical protection and
electro-magnetic interferen
ce protection
• Refer to additional external ringers
• Cover use of special handsets
• Add new Table A, combining previous Tables
A and B
• Add new Table B
• Revise Table F
• Add new Fig. 7, 10, 26, 33, 39, 40, and 46
• Revise Fig. 8, 9, 11, 12, 21, 24, 28, 32, 38,
43, 44, 48, 49, 50, 51, and 52.
Since this reissue is a general revision, no revision
arrows have been used to denote significant changes.
1. 03 The 4A System is a packaged, modular key
telephone system having a maximum capacity
of
16 stations with four common CO/PBX lines,
one personal CO/PBX line per telephone, and two
intercom paths. A wide selection of basic and
optional features is available (see
Part 2). The
Pa ge 3
•3 •32

SECTION 518-450-1 06
system includes five types of telephones: (1)
primary sets, (2) basic satellite desk sets, (3) basic
satellite wall sets,
(4) satellite sets with built-in
speakerphone (BIS), and
(5) satellite sets with
hands-free answer
on intercom (HFAI). Each
primary set contains the control circuitry for two
CO/PBX lines and one intercom path and the
power circuitry to serve itself and some combination
of up to seven satellite sets. The addition of a
second primary set doubles the capacity of the
system; up to seven more satellite sets can
be
connected, with each station in the system now
served
by up to four CO/PBX lines and two intercom
paths. The satellite sets provide the same basic
services as the primary sets,
but they do not
contain control and power circuits.
Caution 1: The 4A System is designed
to operate on CO/PBX loops of 20
milliamperes or greater.
Caution 2: The 4A System is not
intended for installations where
off-premises extensions are required.
1.04 Because the control and power circuitry of
the
4A System is contained in the primary
station sets, there is
no need for separately mounted
key service units such as most key systems require.
The only equipment required in addition to the
telephone sets are interconnecting cables, blocks,
adapters, and small externally mounted units for
some optional features. Systems with many optional
features may require an externally mounted power
unit.
1.05 Each 4A station can be programmed by the
customer to ring
on any combination of the
common CO/PBX lines. All stations have access
to all common lines in the system; therefore, any
set can
be assigned as the attendant station, if
one is required. Each station also has direct access
to the ten intercom codes.
1.06 All 4A telephone sets are available with
either rotary or TOUCH-TONE® dialing.
The primary set is available only in a desk-type
model, but the basic satellite sets can
be ordered
in both desk and wall configurations. The BIS
and HFAI sets are convertible from desk to wall
mounting
by means of a kit of parts . There are
a total of ten telephone set codes in the 980-series
(Table A) . Figures 1 through 5 illustrate typical
sets.
Page 4
1.07 The 4A System derives its ac power from a
standard 117-volt 60-Hz source. The system
components
are protected by a self-resetting thermal
cutout in the power supply of the primary station,
making separate fusing unnecessary. The
19B4
power unit, used when supplementary de power is
required, has both input and output fusing.
1.08 While the 980-series telephones provide more
optional features
than the 830 series (MD)
used with the earlier 4A System (Section 518-450-105),
the two series are compatible and interchangeable.
They can coexist in the same system and 980-series
sets can be used to replace 830-series sets in
existing installations. However, if supplementary
power is required, the primary sets must
be from
the
980 series.
Note: In a mixed system, optional code
busy direct station selection (DSS) keys can
only give busy
indications for 980-series
telephones.
1.09 Certain components and apparatus used with
the
4A System have been rated MD and
replaced
by new units. These units are listed in
Table
B. Throughout the rest of this practice, all
references will
be to the current versions of the
units,
unless the procedures applying to the MD
unit are different in any way; in the latter case,
both units will
be given separate coverage.
1.10 Schematics of the telephone sets and apparatus
units of the
4A System are contained in
SD-69856-01. The schematic of the 1A
transmitter-receiver (built-in speakerphone module)
is in SD-69800-01.
1.11 For additional information on the following
subjects, refer to the documents listed:
4A Speakerphone-Section 512-700-100
33C Voice Coupler-Section 463-341-102
Adjunct Repertory Dials-Section 501-164-201
KS-16301117 Relay-Section 463-110-100
KS-16626112 Relay Set-Section 463-120-100
19B4 Power Unit-Section 167-440-201
Wall-Mounting Fasteners-Section 080-720-105

ISS 3, SECTION 518-450-106
I
TABLE A
SUMMARY OF 4A COMMUNICATION SYSTEM TELEPHONE SETS AND OPTIONS
COMPONENT(SJ REQ UIRED
Personal Line 30AM Apparatus Unit (Note
1)
D-180758 Kit of Parts
Privacy D-180729 Kit of Parts
Wall Mounting D-180747 Kit of Parts
Code Busy DSS Key 664C Key
Station Restriction (Wiring Change Only)
Impaired Hearing G6BM Handset
Handset D-180851 Kit
of Parts
Handset With More D-180413 Handset
Receive Gain Than G6BM D-180851 Kit
of Parts
Weak Speech Handset G7BM Handset
D-180851 Kit of Parts
Set
G8BM Handset
Options
Noisy Location Handset D-180851 Kit
of Parts
Acoustic or Inductive G15A llandset
Coupling Handset D-180851 Kit of Parts
G-Type Handset Equipped G4BM Handset
With Shoulder Rest D-180851 Kit of Parts
Long Loop, 3-dB Transmit G36AM Handset
Gain D-180851 Kit
of Parts
External Speakerphone
4A Speakerphone
D-180732 Kit of Parts
Adjunct Repertory Dial
Repertory Dialing 870A1
or 2870A1
DlOY50 Cord
Built-In Speakerphone (Factory-Installed)
Hands-Free Answering (Factory-Installed)
on Intercom
Power Failure Ringing 248 Apparatus Unit
Supplementary Alerting 25A
Apparatus Unit
Device Access
KS-16626Ll2 Relay
0'
KS-16301L17 Relay
Alerti ng Device and its
Power Unit
Preset Intercom Voice 26A Apparatus Unit
Signaling
System Telephone
Company·
109A Loudspeaker Set
Options
Provided Paging System
Customer-Provided Paging 27A Apparatus Unit
System Interface
(Note 3)
Background r. ·Jusic With Any 33C Voice
Coupler
Paging System (Note 4)
Music-On-Hold 33C Voice
Coupler (Note 4)
D-180980 Kit of Parts
Tone-On-Hold D-180731 Kit
of Parts
External Ringing E1CM, S1AMP, or
LlAM Ringer
Supplementary Power
1984 Power Unit
Note I: Mounted external to telephone set.
Note 2: Option not offered when set is wall mounted.
Note 3: KS-16626L12 relay may also be required.
Note 4: Only one 33C voice coupler is required per system.
DESK BASIC
SA TELLITE SATE LLITE
981A03
TOUCH-
2981A02
SATELLI TE
1983A01
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
518-450-106-i03_1980-01-05.jpg Scanned by Frank Harrell (Cowboy Frank) Castle Rock, Colorado 6/11/2017 /20:36:09
HFAI
SA TELLITE
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Not e 2)
(Note 2)
Page 5

SECTION S18-4S0-1 06
Fig. 1-Primary Telephone Set
Fig . 3-Built-ln Speakerphone Satellite Telephone Set
Fig . 2-Basic Satellite Wall Telephone Set
Page 6
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ISS 3, SECTION 518-450-106
LEAD GUIDE
HFAI
MODULE
Fig. 4-Hands-Free Answer on Intercom Satellite Telephone Set With Faceplate Removed
I
E1-Type Ringers-Section 501-251-100
L1AM Ringer-Section 501-258 - 101
S1AMP Tone Ringer-Section 501-260-100
Electro-Magnetic Interface Protection-X-4235
2. IDENTIFICATION
2.01 The 4A System consists primarily of key
telephone sets and various connecting hardware
and cables. Basic operating features are supplied
as
part of the telephone sets, while additional
1518-450-106-i03_1980-01-07. jpg
apparatus, installed in the sets or externally,
provides optional features.
BASIC FEATURES
2.02 The following features are provided in all
4A System telephone sets and require no
additional installation:
(a) Pickup, Hold, and Illumination-Standard
key system pickup, hold, and line status
lamp indications, including flash on incoming
CO / PBX line calls, steady on answered calls,
and wink-on-hold
are provided. Systems with
one primary set are limited to two common
Page 7

SECTION S 18-450- 1 06
Fig. 5-Basic Satellite Desk Set With Faceplate and Upper Housing Removed
CO/PBX lines; systems with two primary sets
can have up to four lines.
(b)
2-Path Intercom With DSS-Two paths
are provided for intercom calls, each associated
with
an IC button in the pickup key. A busy
path is indicated by a steady lamp adjacent to
the IC button. The DSS buttons allow one-way
voice signaling of called stations without dialing.
A two-way conversation is established when
the
called party goes off-hook and picks up the
intercom path. Ten DSS codes are available; in
systems with more
than ten stations, codes must
be shared. The intercom code is set at each
station
by means of a programming switch and
may be reprogrammed by the customer. Systems
with one primary
set are limited to a single
intercom path; systems with two primary sets
have two paths.
Page 8
(c) Automatic Button Restoration
(ABR)-Depressed line or intercom buttons
are mechanically returned to the unoperated
position when the handset is placed on-hook.
This prevents inadvertent intrusion into calls in
progress when handset is picked up and prevents
lines from being left bridged
after a conference
call.
(d)
Built-In Loudspeaker-The built-in
loudspeaker is bridged across the handset
receiver when
the locking SPKR button is
operated, permitting
other people in the area to
hear both sides of a conversation. The loudspeaker
has a thumbwheel volume control
on the front
of the telephone. This loudspeaker also receives
tone and voice signaling.
Note: In BIS and HF AI sets with 4A
speakerphone added, the bridging feature is
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ISS 3, SECTION 518-450-106
TABLE B
STATUS OF MANUFACTURE DISCONTINUED (MD) COMPONENTS AND APPARATUS
MD UNIT
REPLACED REASON FOR APPLICATION OF
BY
CHANGE
MD UNIT
Meet FCC Registration Previously used
unit can
91A Connecting Block 91B Requirements in 4A be reused in any instal-
System lation
Meet FCC Registration Previously used
unit can
24A Apparatus Unit 24B Requirements in 4A be reused in any instal-
System lation
Meet FCC Registration Previously used
unit can
30A Apparatus Unit 30AM Requirements in 4A be reused in any instal-
System lation
Meet FCC Registration Previously used
unit can
33A Voice Coupler 33C Requirements in 4A be reused in any instal-
System lation
D-180730 Music- Meet FCC Registration Previously used unit can
On-Hold Kit
of
D-180980 Requirements in 4A be reused in any instal-
Parts System lation
19B2 Power Unit 19B4 Meet New Underwriters Any installation
Laboratories Standards
2012B Transformer 2012D Design Improvement Any installation
disabled but equivalent service is provided by
the speakerphone.
(e)
Tone Signaling-The alerting signal for
incoming CO/PBX lines is a tone source
rather than conventional ringing. It is supplied
through the built-in loudspeaker. Each station
can
be individually programmed by the customer
to
be tone signaled on any combination of incoming
CO / PBX lines.
(f)
Voice Signaling-Voice signaling rather
than ringing or tone is provided on the
intercom paths. The calling party alerts the
called station
by voice while holding down the
appropriate
DSS button. The called station
receives this voice signal through
its built-in
loudspeaker. Multiple stations may
be signaled
by depressing more than one DSS button at a
time. When the called station picks up the
handset, the loudspeaker is attenuated.
(g)
Multiline Conferencing-Two or more
CO / PBX lines can be conferenced by a station
by simultaneously depressing
the associated
locking buttons. Transmission quality is degraded
as more lines are added.
Note: Intercom lines cannot be conferenced
with
CO / PBX lines.
(h)
Recall-The R button, located below and
to the left of the dial
on each set, has two
functions:
(1) to drop a line and reoriginate dial
tone without going back on-hook and
(2) to signal
[flash] the
attendant when the 4A System is
behind a
PBX or Centrex. The R button should
be used for these operations instead of depressing
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SECTION S18-450-1 06
..
the switchhook which will cause the line or
intercom buttons to restore.
(i) Outgoing Service During Power
Failure-Outgoing CO/PBX calls can be
made from the
4A System even when local
power has failed.
OPTIONAL FEATURES (TAB LE A)
2.03 The following options are available as
separately installed items or as features of
specific telephones:
(a)
Personal Line-Each station in the 4A
System can be provided with one noncommon,
personal CO/PBX line. Each such line requires
the installation of a separately mounted
30AM
apparatus unit which provides standard key
system pickup, hold, and line status lamp
indications for that line. The personal line is
assigned to a button in the line pickup key. A
given personal line may be shared by more
than
one station in the system, and it will ring at
every station where it is connected. Music- or
tone-on-hold is available as an option with this
feature.
(b)
TOUCH-TONE Dialing-Rotary dialing
can
be replaced by TOUCH-TONE dialing
by ordering appropriate telephone codes. Rotary
dial
and TOUCH-TONE dial sets may be
intermixed in the
4A System without additional
equipment.
(c) Privacy/Privacy Release-A station
equipped with the optional privacy feature
is prevented from entering a CO/PBX call in
progress. Privacy is implemented
on ~per-station
basis by installation of a D-180729 Kit of Parts.
The station can be released from this condition
by the operation of the privacy release feature
at the other station(s) on the call. All 980-series
telephone sets have the factory-wired PRIV RLS
button, which should be designated' only when
at least one station in the system has privacy
installed.
Note: The privacy feature applies to all
CO/PBX lines but not to intercom lines.
(d)
Station Restriction-Placing of all outgoing
CO/PBX calls from a station can be prevented
by shorting
bar changes inside the set.
Page 10
(e) Music - On-Hold-Music from customer-pro-
vided music source is supplied to CO/PBX
lines placed on hold. Installation of one 33C
voice coupler per system and a D-180980 Kit of
Parts in each primary station and each 30AM
apparatus unit is required.
(f)
Tone-On-Hold-An alternative to
music-on-hold, it provides intermittent bursts
of tone to CO/PBX lines placed
on hold. Installation
of a
D-180731 Kit of Parts in each primary station
and each
30AM apparatus unit is required.
(g) Supplementary Alerting Device
Access-The operation of an external relay
to control bells, gongs, horns, etc,
by incoming
ringing
on CO/PBX lines and/or by depression
of an assigned DSS button is provided. This
feature requires installation of a
25A apparatus
unit, an external relay, and a signal with
its
power source.
(h)
Paging-Voice announcements can be made
over
109A loudspeaker sets or a customer-owned
and maintained paging system. The
latter
arrangement requires the use of a 27A apparatus
unit to provide proper interface with the 4A
System. Background music may be provided by
means of customer-provided music and a 33C
voice coupler (same source and coupler used for
music-on-hold). The paging path is activated
by
operation of a DSS button assigned to this
feature. The
109A loudspeaker contains two
customer-accessible volume controls for adjusting
background music and paging volume; background
music is automatically muted during paging.
Note: For normal voice inputs, the minimum
output of the
27A apparatus unit is -30 dBm
into
600 ohms.
(i) Preset Intercom Multiple Voice
Signaling-Allows any number of preselected
stations
and/or paging loudspeakers to be voice
signaled simultaneously
by means of a designated
DSS button. A 26A apparatus unit is required
for this feature.
•
1\
Remember that a DSS code used for
supplementary signaling, paging, or
preset intercom signaling is no longer
available as a station code.
0:37:30

I
(j) Code Busy DSS Key-Lamps in this
DSS key indicate that one or more stations
assigned to a
DSS code are off-hook or being
voice signaled. This feature can
be implemented
on a per-station basis by replacing thefactory-installed
DSS key with an identical size 664C key which
contains LEDs.
Note: In systems where 980-series sets are
mixed with 830-series sets, the
664C key will
indicate busy 980-series sets only.
(k)
Power Failure Ringing-The 24B apparatus
unit provides two
C4B ringers and associated
circuitry to connect the ringers to the
CO / PBX
lines in the event ac power to the 4A System
fails. Installation of a
24B for each primary
station is required.
(1) Hands-Free Answer on Intercom-The
HFAI is available only as a built-in feature
of two
4A telephones (983A02 and 2983A02). It
allows incoming intercom calls to be answered
without any manual action
by the called party;
the microphone in the
HF AI is turned on by
the incoming call. The HFAI station user can
operate a "mike-off"
button to disable the
microphone while still receiving voice signaling
or use a "do-not-disturb" button to both disable
the microphone and block voice signaling.
(m)
Speakerphone-Speakerphone service
permits hands-free conversations on CO/PBX
and intercom lines and is available in the 4A
System in two configurations only.
(1) Built-in speakerphone telephone sets
(983A01 and 2983A01) .
(2) An external 4A speakerphone connected
to the HF
AI telephone set. The installation
of a
D-180732 relay Kit of Parts is required.
The
4A speakerphone cannot be used with
any other
4A System telephone sets.
In all telephones with speakerphone,
the ability to bridge the set loudspeaker
across the incoming line with the
SPKR button is disabled.
(n) Repertory Dialing-This feature is
provided
by connection of an 870A1 (rotary
dial) or
2870A1 (TOUCH-TONE dial) adjunct
repertory dial with a
D10Y-50 cord to desk models
ISS 3, SECTION S18-4S0-106
of satellite telephone sets. It allows numbers
stored in the dial memory to
be called by the
operation of a single button.
(o)
Supplementary Power-A 19B4 power
unit can
be used to increase the basic power
capacity of the
4A System and to compensate
for the additional power required for HFAI sets,
code busy
DSS keys, and 109A paging loudspeakers.
If any of these optional features are employed
in the
4A System, supplementary power may be
required.
Note: The 19B4 power unit supplies only
24-volt battery to the
4A System. The built-in
power supplies in the primary sets continue
to provide lamp power to the system and
control circuit power to the primary sets when
a
19B4 is connected.
(p)
External Ringing-This feature is provided
by connecting an external ringer (such as
an
E1CM, S1AMP, or LlAM) across the CO/PBX
tip and ring leads at the network interface.
(q)
Special Purpose Handsets-The K1C
handset supplied with each 4A System desk
telephone can
be removed and replaced with a
standard G4 or G15 handset or with one designed
for long loop, handicapped users, or noisy
locations. A
D-180851 Kit of Parts must be
installed on the new handset to adapt it to the
4A System telephone.
TELEPHONE SETS
2.04 The 980-series telephone sets are completely
new in design; all components are connected
by means of plugs and jacks for quick assembly
and replacement.
Primary and basic satellite sets
are packaged in housings of the same width,
but
the primary sets are somewhat deeper because of
the control and power circuitry they contain. The
BIS and HFAI satellite sets require a wider housing
to accommodate their additional features.
2.05 The basic features described in paragraph
2.02 appear in all sets. The 663A2 line key
contains ten buttons-hold, four common CO/PBX
lines, an optional personal line, two intercom paths,
an optional privacy release, and built-in loudspeaker
on /off control. The LED status lamps are associated
with each line and intercom
path button. The 664B
DSS key consists of two horizontal rows of five
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SECTION 5 18-450- 1 06
buttons, each of which may be assigned to one or
more stations, a paging loudspeaker, supplementary
ringing or preset multiple signaling. Between the
two rows of DSS buttons and under a hinged cover
are the programming switches for DSS code
assignment and CO/PBX line ringing control. The
built-in loudspeaker is located under the handset,
and its volume control is below and to the
right
of the dial. The recall (R) key is below and to
the left of the dial. All sets employ the KlC
modular handset. The rotary dial is standard, but
TOUCH-TONE dial is available.
2.06 The internal arrangement of the telephones
is based
on the use of a molded plastic
chassis to which the components of the set are
attached and an electrical interconnect field into
which the components are plugged (Fig.
5). The
interconnectfield also contains positions for plugging
in optional features and switches A through H for
adapting the set to options. Outside connections
are made by way of the set mounting cord or
separate cords for such optional features as personal
lines,
4A speakerphone, and repertory dialing. In
primary sets (Fig.
6), the mounting cord plugs into
a wiring harness which distributes leads to the line
key and the control logic board. In the other
desk-type sets, the mounting cord plugs directly
into the line key. The system connector cable is
intended to
be plugged directly into the wall sets
without the use of mounting cords, which are not
supplied with wall sets.
2.07 Mounted on the base of each primary set is
a logic board containing control and power
circuitry for two
CO / PBX lines and one intercom
path, and a transformer for supplying ac power to
the logic board (Fig. 6) . Up to seven satellite
telephones can derive
their power from one primary
set. Each primary set contains a polarity guard
circuit which prevents battery reversals
on the
CO / PBX lines from interfering with TOUCH-TONE
dial operation and multiline conferencing.
PBX INTERFACE
2. 08 The 4A System will interface with all PBXs
except that it cannot provide for ground-start
operation
of CO trunks which bypass the PBX in
the event
of PBX power failure. In all other
respects, the system performs
on PBX lines in
the same manner as
on CO lines. For PBX use,
the only restriction
on the number of telephone
sets is
that each 25-pair connector cable system
Page 12
can serve a maximum of 2 primary stations and
14 satellite stations. Although 4A telephone sets
behind a
PBX have full capabilities, they can contact
telephones in other systems only via
PBX lines.
To signal the PBX operator, the recall button must
be used.
FCC REGISTRATION
2.09 The 4A System was tested per, and complies
with, the rules and regulations in Subpart
D of
Part 68 of the FCC rules. The FCC has
defined a register-only
date after which new
product, which is registered, can be installed. Old
product which is not registered but had previously
been installed is
"grandfathered" and may be
reinstalled.
2.10 The system may be interconnected in a
"home-run" configuration, in a bridged
configuration, or in a combination of both methods
(Fig.
7). All interconnections between the 4A
System and the telephone network must be made
via a
standard jack (eg, RJllC or RJ14C) and fully
protected premises wiring. The type of network
address signaling is E and the ringer equivalence
number for the system varies from one to five as
a function of the number of power failure ringer
apparatus units a particular configuration contains.
ORDERING GUIDE
A. Telephone Sets
2.11 Order the required telephone sets from the
following list. Sets are supplied in ivory
only and
are shipped with E-6723 key designation
tabs and disposable faceplates. Order the desired
permanent faceplates separately:
(a)
Primary Sets-Order one for a system
with one or two CO/PBX lines and one
intercom path; order two for a system with three
or four CO/PBX lines and two intercom paths.
• 981A01 (desk model, rotary dial; includes
D50AB-50 mounting cord)
• 2981A01 (desk model, TOUCH-TONE set;
includes D50AB-50 mounting cord).
(b) Satellite Sets-Order as required.
~ 18-450-106- " 03_1980-01-12 . jpg Scan e b Frank Harrell (Cowboy Frank) Castle Rock, Colo ado 6/11/2017/20: 38 :00

l
ISS 3, SECTION 518-450-106
TRANSFORMER
AMPLIFIER
LOWER HOUSING WITH
BASE AND LOGIC ASSEMBLY
Fig. 6-Primary Set Disassembled
(1) Basic Satellite Desk Sets:
• 981A02 (desk model, rotary dial; includes
D50A W -50 mounting cord)
• 2981A02 (desk model, TOUCH-TONE set;
includes
D50A W-50 mounting cord).
(2) Basic Satellite Wall Sets:
• 981A03 (wall model, rotary dial; mounting
cord not included)
• 2981A03 (wall model, TOUCH-TONE set;
mounting cord not included).
(3) The BIS Satellite Sets:
• 983A01 (desk model, rotary dial; includes
D50A W -50 mountingcord, D8W -50 speakerphone
power cord,
2012D transformer, and 86A
connecting block to provide an interface for
D or H station wire or D inside wiring cable
used to connect the
2012D to the BIS set)
• 2983A01 (desk model, TOUCH-TONE set:
includes
D50A W -50 mounting cord, D8W -50
speakerphone power cord, 2012D transformer,
and
86A connecting block to provide an
interface for D or H station voice or D
inside wiring cable used to connect the
2012D to the BIS set).
Note: Desk model of BISset can be converted
to wall set
by use of kit of parts listed in
paragraph
2.14.
(4) The HFAI Satellite Sets:
Keep in mind when ordering HFAI
sets that each one consumes as much
power as any other two stations;
therefore, either the total number of
stations in the system may have
Page 13
]518-450-106-i03_1980-01-13.jpg Scanned by Frank Harrell (Cowboy Frank) Castle Rock, Colorado 6/11/2011/2 ·38·

SECTION 518-450- 1 06
A. BASIC HOME-RUN WIRING SYSTEM
I TELEPHONE I
I
TELEPHONE I
I TELEPHONE
I
MAIN SYSTEM CABLE
TELEPHONE l
I TELEPHONE I
B. BASIC BRIDGED WIRING SYSTEM
TELEPHONE
C. COMBINATION OF BRIDGED WITH HOME-RUN SYSTEM
Fig. 7-Simplified Block Diagram of Basic Wiring Methods
Page 14
•
l518-450-106-i03_1980-01-14.jpg Scanned by Frank Harrell (Cowboy Frank) Castle Rock, Colorado 6/11/2011/ 2 ·38:3

to be reduced or supplementary
power used (see paragraph 3.13).
• 983A02 (desk model, rotary dial; includes
D50A W -50 mounting cord)
• 2983A02 (desk model, TOUCH-TONE set;
includes
D50A W -50 mounting cord).
Note: Desk model of HFAI set can be
converted to wall set by use of kit of parts
listed in paragraph 2.14.
2.12 Order the following as required depending
on the types of telephones being installed:
• Block, Connecting, 91B (order one for each
primary station)
• Faceplate, 61C-t (for 981-type sets)
• Faceplate, 261C-t (for 2981-type sets)
• Faceplate, 63D-t (for 983-type sets)
• Faceplate, 263D-t (for 2983-type sets)
t Add color code suffix as follows:
Avocado (-100)
Teak (-108)
Walnut (-109)
Gold (-111)
Orange (-112)
Brown (-113)
Red (-114)
Blue (-115)
Black (-118)
B. Optional Apparatus
2.13 Order the following apparatus as required
to implement options (see Table
A) .
(a) Personal Line:
• Unit, Apparatus, 30AM (order one for each
personal line to
be installed; includes 95B1
power unit)
• D-180758 Kit of Parts (consists of 86A
connecting block,
D8W -50 cord, jack assembly,
plug retainer, and mounting bracket; order
one for each primary, basic satellite, or
ISS 3, SECTION 518-450-106
HFAI satellite set to be equipped with a
personal line;
do not order for BIS satellite
set to be equipped with a personal line).
(b)
External 4A Speakerphone (order one
of each of the following for each
HF AI
station to be equipped):
• Adapter, 223C (includes D16H-50 cord and
M2FG cord)
• D-180732 Kit of Parts (includes relay board
and button stop for SPKR button)
• Loudspeaker, 108A (any color)
• Transmitter, 680A (any color)
• D-180508 Kit of Parts (provides ivory housing
for loudspeaker and ivory trim for transmitter)
• Unit, Power, 85B1-49.
(c) Repertory Dialing:
• Dial, Repertory, Adjunct, 870A1 (rotary dial)
or
2870A1 (TOUCH-TONE dialing) (order
one for each desk-type satellite station to
be equipped for repertory dialing)
• Cord, D10Y-50 (order one for connecting dial
to telephone; 2 feet long)
• Unit, Power, 95B1 (order one for each
repertory dial).
(d) Power Failure Ringing:
• Unit, Apparatus, 24B (order one for each
primary set to be provided with power
failure ringing).
(e) Access to Supplementary Alerting
Device:
• Set, Relay, KS-16626L12 or Relay, KS-16301L17
(order one for use with 25A apparatus unit
to operate an auxiliary signal)
• Unit, Apparatus, 25A (order one for each
supplementary signaling device to
be operated)
• Desired alerting unit and its power source.
Page 15
Scanned by Frank Harrell (Cowboy Frank) Castle Rock, Colorado 611112017 I 20:38:51

SECTI ON S18-450-1 06
(f) Preset Intercom Voice Signaling:
• Unit, Apparatus, 26A (order one for each
preset intercom voice-signaling
arrangement
to be installed).
(g) Paging:
• Set, Loudspeaker, 109A (order quantity
required for paging and background music;
includes wall mounting bracket with
85A
connecting block attached, D8W cord, and
four rubber washers).
Each 10 9A loudspeaker consumes as
much power as a primary, basic satellite,
or BISset. Refer to paragraph 3.14.
• Coupler, Voice, 33C (one is required for
background music on any paging system;
can be same one used for music -on-hold)
• Unit, Apparatus, 27A (order one for interface
between
4A System and a customer-owned
and maintained
[COAM] paging system)
Note: The 27A will not drive COAM speakers
directly.
• Set, Relay, KS-16626L12 (order one for use
with
COAM paging system that requires a
contact closure).
(h) External Ringi n g:
• Ringer, E1CM, S1AMP, or L1AM (order up
to
three for each CO/PBX line to be equipped
with external ringing but
no more than
two if power failure ringing is provided).
(i) Supplementary Power:
• Unit, Power, 19B4 (order one if the power
requirements of the system being installed
exceed the capacity of the built-in power
supplies in
the primary sets; refer to
paragraph 3.14 for details of calculating
power requirements)
Page 16
• Cord, Power (order one of required length
for
19B4 power unit):
824013262 (P-40J326)--1-1/2 feet
824013270 (P-40J327)--2 feet
824013288 (P-40J328)--4 feet
824013296 (P-40J329)--6 feet
824010995 (P-40J099)--12 feet.
C. Optional Components
2.14 Order the following components as required
to implement options (see Table
A) .
(a) Privacy:
• D-180729 Kit of Parts (privacy circuit board;
order one for each station to be locked out).
(b) Mus i c-On -Hold:
• Coupler, Voice, 33C (order only one per
system when music-on-hold is provided
and/or when background music is provided
on paging system)
• D-180980 Kit of Parts (music-on-hold circuit
board; order one for each
primary station
and each personal line to
be equipped with
music-on-hold).
(c) Tone -On-Hold:
• D-180731 Kit of Parts (tone-on-hold circuit
board; order one for each primary station
and each personal line to be equipped).
(d) Wall Mounting:
• D-180747 Kit of Parts (order one for each
BIS or HF AI set to be converted from desk
set to wall set).
(e) Code Busy Indication:
• Key, 664C (code busy DSS key; order one
for each station to be equipped for busy
status indication; includes E-6873 key
designation tabs).
Each 66 4C key consumes as much
power as a primary, basic satellite, or
BIS set.
~ 18-450-106- " 03_1980-01-16 . jpg Scan e b Frank Harrell (Cowboy Frank) Castle Rock, Colo ado 6/11/2017 I 20 : 39 :05

I
(f) Handsets for Special Applications:
• Handset, G6BM (impaired hearing, modular)
• Handset, D-180413 (more receive gain than
G6BM, modular)
• Handset, G7BM (weak speech, modular)
• Handset, G8BM (noisy location, modular)
• Handset, G15AM (general use, modular)
• Handset, G4BM (G-type equipped with
shoulder rest, modular)
• Handset, G36AM (long loop, 3-dB transmit
gain, modular)
• D-180851 Kit of Parts (ivory transmitter
ISS 3, SECTION 518-450-106
(d) Cables, Connector (for system cabling
between telephone sets; specify desired
length):
• A25B (single-ended)
• A25B (double-ended)
• A25D (single-ended)
• B25A (double-ended).
(e) Cable, D Inside Wiring
(f) Cord, D50AB-50
(7 feet or 18 feet; extension
mounting cord for satellite sets;
not intended
for extending primary set mounting cord)
(g) Cord, D4BU or D6AP (double-ended, modular)
and receiver covers; order one for each (h) Wire, Station,
D, H, or SK
handset).
D. Interconnection Components
2.15 Unless otherwise noted,
the following list
consists of typical components recommended
for interconnecting
the parts of the 4A System.
Refer to Fig. 8 and 9 for typical connection
arrangements.
(a) Adapater, 3-Way Bridging, KS-19252 type
(b) Block, Connecting, 91B
(required for
connecting primary set to network interface
and system cable)
(c) Blocks, Connecting, 66-Type in various
configurations:
• Backboard, 184A1 (includes two 66B4-25
blocks)
• Backboard, 184B2 (includes four 66B4-25
blocks)
• Block, Connecting, 66E3-25
• Adapter, 161A (adapts 66-type terminals
for spade-tipped leads).
E. Replaceable Components
2.16 All Sets:
• Amplifier, 84100911)3
• Assembly, Dial, Rotary, 841010770 (includes
8TA-119 dial)
• Assembly, Dial, TOUCH-TONE, 841010762
(includes 35AU3A dial)
• Assembly, Loudspeaker, 841009053
• Cord, H4DU-50 (handset cord)
• Form, E-6723 (key designation tabs for line
keys and
standard DSS keys)
• Form, E-6873 (key designation tabs for code
busy DSS keys)
• Handset, K1C-50
• Jack, 616JK (handset jack)
• Key, 663A2 (line key)
• Key, 664B (DSS key)
• Key, 683C (recall key)
Page 17
l518-450-106-i03_1980-01-17.jpg Scanned by Frank Harrell (Cowboy Frank) Castle Rock, Colorado 6/11/2011/ 2 ·3 ·22

SECTION S18-450-1 06
T
c
0 T
,R
fNETWORK -, 04BU CORD I 91 B l
D50AB MTG
I PRIMARY I
0/PBX
I <I CONN BLK
SET
(LINES 1
AND 2) t...:~R~C.:J ( 25 FT MAX) I (NOTE 1) I
CORD
(7 FT ONLY)
I (NOTE 1)
A25B CONN CABLE
I I
MOH
4C3
1.1 09A LOUD-I
t I
33C
FROM
p
CUSTOMER
I SATELLITE I I~PEAKER I
VOICE
PROVIDED
SET SET BGM
I COUPLER
MUSIC SOURCE
1** H
STA .
I SATELLITE I DBW
I
B6A
I
WIRE 130AM
t
95B1
I
CONN
I APPARATUS
PQWER
SET I CORD
I
BLK
I
OR DIW UNIT UNIT
*
CABLE
-1**
D4BU CORD
g
T ,R fNETWORK-, (25
FT MAX)
I APPARATUS
TO
UNIT
CO/PBX
I <1~
(NOTE 2)
(PERSONAL t...:NTERFAC~
(NOTE 3) LINE)
--
__J
1-i ~~i~RATUS I MTG CORD I SATELLITE I
t
(NOTE 2) I OR D50AB I SET
EXT . CORD
*
L(NOTE 3)
* * I
SATELLITE I
I SET
MORE TELEPHONE SETS
AND SYSTEM COMPONENTS
* I
SATELLITE I
CAN BE ADDED AS NEEDED
I SET
,
I'
0 0 0 0 0 0 0 0 0 0 0 0 0 0
SIG t
0 0 0 0 0 0 0 0 0 0 0 0 0 0
GRD j
19B4
0 0 0 0 0 0 0 0 0 0 0 0
o39
POWER
0 0 0 0 0 0 0 0 0 0 0 0
040
24V DC I
UNIT
~~
B SIG
~
......
-
0 0 0 0
0-
0 0 0 0
......
0 0 0 0 ......0
0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 ' 0 0 0 0
~
0 0 0 0 0
G)
..... ..... ..... ..... .....
.....
P/0 66B4-25
STR
1
APS
P/0 66B4-25 I P/0 66B4-25
CONN BLOCK CONN BLOCK STRAPS
CONN BLOCK
P/0 1B4B2 BACKBOARD
SEE NOTES 1, 2 AND 3 OF FIG. 9. P -
PAGING
BGM - BACKGROUND MUSIC
MOH - MUSIC ON HOLD
* SYSTEM CABLING (25 PAIR) MAY CONSIST OF D INSIDE WIRING (IW) CABLE
OR B25A, A25B OR A25D CONNECTOR CABLES .
** SATELLITE SETS CONNECTED VIA MOUNTING CORDS SUPPLIED OR D50AB EX T ENSION
CORDS, USED WITH SYSTEM CONNECTOR CABLE OR 66E3-25 BLOCK WITH DIW CABLE.
t 0 OR H STATION WIRE OR OIW CABLE.
Fig. 8- Typical Installation Using "Home-Run" Connections
Page 18
518450-106-i03_1980-01-18.jpg Scanned by Frank Harrell (Cowboy Frank) Castle Rock, Colorado 6/11/2017 /20:39:37
I

FROM
CUSTOMER
PROVIDED
MUSIC SOURCE
P - PAGING
MOH - MUSIC ON HOLD
BGM - BACKGROUND MUSIC
NOTES :
D5DAB MTG CORD
(7 FT ONLY)
MOH
1. IF LINES 3 AND 4 ARE REQUIRED, ANOTHER
PRIMARY SET AND 91B CONNECTING BLOCK MUST
BE CONNECTED INTO SYSTEM .
2. 24B , 25A, 2SA AND 27A APPARATUS UNITS CAN BE
INSERTED INTO SYSTEM CABLING AT ANY POINT.
3. 24B APPARATUS UNIT REQUIRES CONNECTION TO
NETWORK INTERFACE VIA 04BU CORD OR TO 91B
BLOCK ASSOCIATED WITH PRIMARY SET VIA H
STATION WIRE OR 0 INSIDE WIRING CABLE . THE
25A AND 27A UNITS REQUIRE CONNECTION TO
EXTERNAL EQUIPMENT VIA SUITABLE WIRE PAIRS.
* KS-19252 BRIDGING ADAPTER OR SSE3-25 CONNECTING BLOCK .
** SYSTEM CABLING (25 PAIR) MAY CONSIST OF 0 INSIDE WIRING (IW) CABLE
OR B25A, A25B OR A25D CONNECTOR CABLES .
t SATELLITE SETS ARE CONNECTED VIA MOUNTING CORDS SUPPLIED, 050AB
EXTENSION CORDS , OR A25B OR B25A CONNECTOR CABLES .
tt D OR H STATION WIRE DR DIW CABLE .
ISS 3, SECTION S18-450-106
I
I
MORE TELEPHONE
SETS AND SYSTEM
COMPONENTS CAN
BE ADDED AS NEEDED
Fig . 9- Typical Installation Using Bridged Connections
Page 19

SECTION 518-450-1 06
• D-180828 Kit of Parts (963E-2 connectors
for use as shorting bars
on interconnect
field)
• Potentiometer, 842618985 (loudspeaker volume
control).
2.17 Primary Sets:
• Assembly, Base, and Logic, 841009087 (includes
base, control logic board, and wiring harness)
• Assembly, Field, Interconnect, 841009954
• Cord, D50AB-50 (mounting cord, 7-foot only)
• Housing, Upper, 61AU-50
• Housing, Lower,
61BL-50
• Transformer, KS-21361L5 (includes 6-foot
power cord and
heat sink).
2.18 Basic Satellite Sets:
• Assembly, Field, Interconnect, 841009954
(wall sets only)
• Assembly, Field, Interconnect, 841009988
(desk sets only)
• Cord, D50A W -50 (mounting cord, desk sets
only)
• Housing, Lower, 61AL-50 (desk sets only)
• Housing, Upper, 61AU-50
• Housing, Wall, 61AY-50 (wall sets only).
2.19 BIS Satellite Sets:
• Assembly, Field, Interconnect, 841015449
• Circuit, Interface Signaling, Voice, 841010788
• Cord, D8W -50
• Cord, D50A W -50
• Housing, Lower, 63AL-50
• Housing, Upper, 63AU-50
Page 20
• Transformer, 2012D
• Transmitter-Receiver, 1A (BIS module)
2.20 HFAI Satellite Sets:
• Assembly, Field, Interconnect, 841015050
• Cord, D50A W -50
• Housing, Lower, 63AL-50
• Housing, Upper, 63
AU-50
• Module, HF AI, 841010796 .
3. INSTALLATION AND CONNECTION
PLANNING
3.01 Consult with the customer to determine
where the
4A System stations should be
installed, optional features desired, the best routes
for interconnecting cables, intercom
code assignments,
paging requirements, and the optimum locations
for connecting blocks,
apparatus units, adapters,
etc.
Caution:
Remind the customer that after
installation has been finished, primary
station power cords must remain plugged
in or service will be interrupted.
3.02 Select the most appropriate method of
interconnecting the stations of the
4A System
(Fig.
7) . Use existing cabling from a previous
installation, if possible.
Caution:
If supplementary power from
a 19B-type power unit is needed, the
"home-run" method of cabling must be
used.
(a) "Home-run" cabling-In this method, each
station is separately cabled back to a common
cross-connection field such as a
184B2 backboard.
A typical "home-run" installation
is shown in
Fig.
8. The "home-run" cabling method is
preferred over other methods because
it is usually
simpler to install and allows maximum system
growth.
(b ) Bridged cabling-In this method, each station
is bridged across a main cable which carries