AT&T 27020 User manual

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BELLSYSTEM PRACTICES
AT
&
TCo Standard SECTION 502-703-103
Issue 4, September 1978
REFERENCE
27020, 2702DM, 27138, AND 27138M TELEPHONE SETS
1. GENERAL
Gl5A HANDSET
1.01
This section contains identification, installation,
maintenance, and connection information for
the 2702D (MD), 2702DM (MD), 2713B (MD), and
2713BM telephone sets.
1.02
This section is reissued to:
• Revise Fig. 17 (modular connection of 281A
adapter)
• Add Fig. 18 (modular connection ElCM
ringer)
2. DESCRIPTION
2.01
The 2702D or 2702DM telephone set (Fig. 1
or 2) is equipped with a message waiting
lamp and is intended for PBX use.
G3-TYPE HANDSET
-~ --- I
Fig. 1-2702D Telephone Set
2.02
The 2713B or 2713BMtelephone set (Fig. 3)
is equipped with 2-line pickup with hold on
either line (CO lines, nonkey system).
Fig. 2-2702DM Telephone Set
Fig. 3-2713B Telephone Set
Ordering Guide
2.03
Basic Telephone Sets:
• Set, Telephone, 2713BM-* (modular)
*
Add appropriate color suffix.
NOllCE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1

TCI Library- http://www.telephonecollectors.info/
SECTION 502-703-103
TABLEA
TELEPHONESET FEATURES
CO AND 1A KEY TELEPHONE
SYSTEM LINES
DIAL/ MESSAGE RINGER
TELEPHONE
SET NIGHT WAITING VOLUME/ OFF- INDIVIDUAL OR 2-LINE PICKUP SIGNALING
LAMP LAMP CONTROL 2-PARTY FLAT WITH HOLD
2702D, DM •
2702B, BM •
* Not equipped with internal ringer.
tOptional features:
• •
*
RATE SERVICE (CO LINES ONLY)
•
• • t
(1) 2713B: Change mounting cord to provide signal leads.
(2) 2713BM: Due to insufficient mounting cord leads, the dial light transformer leads or leads from
the 2nd line must be used.
2.04 These telephone sets are available in all
standard colors.
2.05 For replaceable component information, refer
to Table B, or for housing and plunger
assembly information, refer to Table C.
2.06 OperatiD.g Features.
• Message Waiting Lamp: 2702D or DM
set-visual signal, under control of a PBX
attendant, indicates a message has been left
with the operator (Fig. 1 or 2).
• Line and Signal Key: 2713B or BM
set-permits line selectionbyturning, signaling
by depressing (Fig. 3 and 6).
• Hold Key Plunger: 2713B or BM
set-provides for mechanical hold on either
or both nonselected CO line (Fig. 3).
• Night Light Switch: allows dial lamp
to be operated at reduced intensity (dial
lamp illuminates dial at full intensity with
handset off-hook) (Fig. 4).
• Ringer Volume Control: provides
manual control of ringer volume on 2702D
or DM sets (Fig. 5).
Page 2
NIGHT LIGHT SWITCH
Fig. 4-2700-Type Telephone Set, Rear-Night Light
Switch location
3. INSTALLATION
3.01 Insofar as possible be guided by the customer's
wishes in placing apparatus. Consider the
following.
• Safety for yourself, customer, and maintenance
personnel.
• Availability of power outlet for dial lamp
transformer.
• Location of telephone to provide adequate
ringer coverage of area.
• General appearance of installation.

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ISS 4, SECTION502-703-103
TABLE B
ORDERING GUIDE
REPLACEABLE TELEPHONE SET
COMPONENTS 2702D 2702DM 2713B 2713BM
Cord, Handset H4CJ* H4DU-* H4CJ-* H4DU-*
D4BT-29 D4BU-29 D6AF-87(MD) D4BU
Cord, Mtg. D6AP-87
Dial 35AD4A 35AD4A 35AD4A 35AD4A
Housing and Table C Table C Table C Table C
Plunger Assembly
Key, Line
- -
638F 638F
Lamp, Dialt KS-19387Ll KS-19387Ll KS-19387Ll KS-19387Ll
Socket, Dial Lampt KS-19240L2 KS-19240L2 KS-192040L2 KS-19240L2
Lamp, Message Waiting KS-16893Ll KS-16893Ll
--
Transformer (Dial Lamp) 2012A or C 2012A or C 2012A or C 2012A or C
Retainer, Number Card 812558039 812558039 812558039 812558039
(P-25E803) (P-25E803) (P-25E803) (P-25E803)
Ringer
MlA orPlA MlA orPlA
External El- External El-
Type (If Type (If
Required) Required)
Set Hand G3A-* Gl5A-* G3A-* Gl5A-*
Kit of Parts (Polarity D-180229 D-180229 D-180229 D-180229
Guard):j:
*
Add appropriate color suffix.
t Available as D-179919 Kit of Parts (containing lamp, socket, and installation instructions).
:j:Optional and consist of the following:
• 819040544 (P-90D064) Guard Assembly
• 812166759 (P-21F675) Terminal Board Assembly
• 812651644 (P-26El64) Retainer
• 814313920 (P-43A392) Screw
3.02
Select a 105-120volt ac receptacle on a circuit
not controlled by a switch for dial lamp
transformer. A 2A clamp is available to secure
the 2012A transformer to the service outlet.
Current model transformers utilize folded blade
prongs to secure the transformer to the service
outlet. For multipled dial lamp sets, see section
coveringstation transformers for selection information.
Danger: Securely attach 2A or similar
retaining clamp to
ac
outlet using
outlet cover screw before attempting
to install 2012-type transformer. The
transformer and any other cord
plugged into the
ac
outlet should
always be unplugged completely from
outlet before attempting to attach or
Page
3

TCI Library- http://www.telephonecollectors.info/
SECTION 502-703-103
TABLE C
HOUSING AND PLUNGER ASSEMBLY
TELEPHONE SET
COLOR
2702D 2713B
Black 818580037 818449035
(P-85H003) (P-84D903)
Ivory 818580508 818449506
(P-85H050) (P-84D950)
Green 818580516 818449514
(P-85H051) (P-84D951)
Red 818580532 818449530
(P-85H053) (P-84D953)
Yellow 818580565 818449563
(P-85H056) (P-84D956)
White 818580581 818449589
(P-85H058) (P-84D958)
Rose Pink 818580599 818449597
(P-85H059) (P-84D959)
Lt.
Beige 818580607 818449605
(P-85H060) (P-84D960)
Aqua Blue 818580623 818449621
(P-85H062) (P-84D962)
remove the clamp. Do not use 2A
or similar retaining clamp on outlets
where center mounting screw holds
the duplex outlet in the box.
Caution: Do not connect more than
one transformer to the
same
inside
wiring pair.
For proper illumination of the dial,
the wire run between transformer
and telephone set should not exceed
250 feet of standard inside wire. Do
not use a 25-foot mounting cord
because the added resistance may
result in decreased illumination.
2702DM
840705016
840705024
840705032
840705040
840705057
840705065
840705073
840705081
840705099
27138M
840701759
840701767
840701775
840701783
840701791
840701809
840701817
840701825
840701833
3.03 Install these sets in accordance with standard
practices for desk-type telephone sets. Fig. 5-2702D Telephone Set, Partial Bottom View
Page 4

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LINE AND
SIGNAL KEY
ISS 4, SECTION S02-703-103
Fig. 6-•2713BM Telephone Set, Housing Removed•
3.04
External Ringer:
Install an El-type
ringer, when required, for 2713B or BM
telephone sets.
3.05
Polarity Guard (optional):
Install
polarity guard (D-180229 Kit of Parts) only
when specified by local instructions for end-to-end
signaling. Installation is as follows.
(1) Remove housing; loosen dial mounting screws
and move the dial to one side without
disconnecting the dial leads.
(2) Insert the 812651644(P-26E164) retainer in
left-hand dial mounting bracket (Fig. 7).
(3) Insert tabs of 812166759(P-21F675) terminal
board into notches in right-hand dial mounting
bracket and secure to retainer using 814313920
(P-43A392) screw.
(4) Connect polarity guard in accordance with
connections shown in Table D.
(5) Reinstall dial on mounting bracket, securing
the 819040544 (P-90D054) guard assembly
mounting bracket under the right-hand dial
mounting screw (Fig. 8).
(6) Reinstall housing.
Note:
The 812166759 (P-21F675) terminal
board and 812651644 (P-26E164) retainer,
furnished with D-180229 Kit of Parts, are not
used in sets equipped with message waiting
lamp (2702D or DM set). The 2702D or DM
set has spare terminals 3 and 4 on the message
waiting lamp terminal board to facilitate
connecting the polarity guard (Fig. 9).
3.06
Operating Instructions (2713B or
BM): If
a call is received on one line and
it is desired to hold a party on a line while
transferring to the other line.
Page S

TCI Library- http://www.telephonecollectors.info/
SECTION 502-703- 103
Fig. 7-lnstalling Terminal Board Retainer in PRINCESS
Telephone Set
(1) Lift the hold key (left line switch plunger)
and turn the line key to pick up the second
line.
(2) When the call on the second line is completed,
turn the line key back to the first line
position and then depress the hold key.
Note: Failure to depress the hold key will
automatically place a hold on the unused line
preventing its being used for either incoming
or outgoing calls. Reversal of this procedure
(i.e. depressing the hold key before switching
the line key back to the first line position)
will disconnect the first line.
(3) If the second line is to be picked up by an
extension station, the hold key is left operated
(lifted) until the extension is answered. After
the extension handset is lifted, the hold key
(first set) must be depressed to permit conversation
path of the extension.
(4) The hold key is automatically returned to
normal when the handset is replaced.
3.07 Jacks and plugs are available for portable
installations of these telephone sets. Refer
to appropriate section in Division 461 for selection.
Page 6
Fig. 8-Polarity Guard Mounted in PRINCESSTelephone
Set
3.08 A 124Aapparatus blank is available to insert
into the rear notch when not filled.
4. MAINTENANCE
4.01 Maintenance of the 2700-type telephone sets
is limited to replacing defective components.
4.02 Housings, handsets, and cords may be cleaned
with a damp KS-2423 (or equivalent) cloth.
Do not use scouring cleaners or volatile
solvents as these
may
damage finish.
4.03 Refer to sections covering dials, handsets,
cords, ringers, etc., for maintenance of these
components.
4.04 Those housings manufactured from 1970
through 1974 must be modified due to a
clearance problem, if they are used with a base
containing a P-type ringer and/or 4228G network.
Modify as follows.
(1) Using diagonal side cutters, clip off a portion
of the plunger-well snap-tabs, which
interfere with the P-type ringer and/or network,
as shown in Fig. 10.
Note: Tabs should be cut at an angle leaving
1/16-inch at the plunger well. Tabs longer
than 1/16-inch will cause the plunger to bind
when housing is installed. Tabs less than
1/16-inch will permit plunger to fall through.

TCI Library- http://www.telephonecollectors.info/
ISS 4, SECTION 502-703-103
Fig. 9-812166759 (P-21F675) Terminal Board Installed in 2702D Telephone Set
4.05
Housings manufactured prior to 1970 have
no tabs. Housings manufactured after 1974,
identified by an embossed "N" inside the housing,
do not require modification for the 4228-type
network. Housings identified by an embossed
"NP"
inside the housing do not require modification.
5. CONNECTIONS
Without a polarity guard the
TOUCH-TON» dial
will
operate only
with the orange-black dial lead connected
to the negative (ring) side of the line
and the green dial lead connected
to the positive (tip) side.
Page
7

TCI Library- http://www.telephonecollectors.info/
SECTION 502-703-103
WIRE
OR
LEAD
Line
Switch
Dial
D-180229
Polarity
Guard
TABLED
TELEPHONESET POLARITY
GUARD CONNECTIONS
(D-180229 KIT OF PARTS)
REMOVE CONNECTTO
FROM
COLOR
NET. NET. TERM
BLOCK*
BR C 4
BK RR 3
R 3
BK 4
G RR
w C
*Component of message waiting lamp assembly located
between dial mounting brackets. Use screws from ter-
minal board in D-180229 Kit of Parts.
Page 8
Fig. 10-Modification of Housing

TCI Library- http://www.telephonecollectors.info/
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TCI Library- http://www.telephonecollectors.info/
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SECTION502-703-103
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13-2702DM Telephone Set,
Equipped
With 4010D Network, Connections (Sheet 1 of 2)
Page
12
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(BR)
(Y)
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(SI

TCI Library- http://www.telephonecollectors.info/
(G)
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ISS 4, SECTION 502-703-103
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Fig. 13-2702DM Telephone Set, Equipped With 4010D Network, Connections (Sheet 2 of 2)
Page 13

TCI Library- http://www.telephonecollectors.info/
SECTION502-703-103
IN
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Fig. 14-2702DM Telephone Set, Equipped With 4228G Network, Connections (Sheet 1 of 2)
Page 14
(W)
(G)
(G)
(BK)
(R)
(BK)
(BR)
(Y)
(R)
(R)
(5)

TCI Library- http://www.telephonecollectors.info/
ISS 4, SECTION502-703-103
~
4228-TYPE NETWORK 616P
JACK ASSY >~H<40U ,..g GISA r.W HANDS.t_TCORD. " HANDSET @] 35-TYPE
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Fig. 14-2702DM Telephone Set, Equipped With 4228G Network, Connections (Sheet 2 of 2)
Page 15/16

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TCI Library- http://www.telephonecollectors.info/
SECTION
502-703-103
INS
I~
WIRE
TIP
(BK)
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2 ["'
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LINE
1
RING (R)
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Fig. 16-2713BM (Early Version} Telephone Set, Connections (Sheet 1 of 2)
Page 18
:I'
k
(W-BL)
(G)

TCI Library- http://www.telephonecollectors.info/
ISS 4, SECTION 502-703-103
NETWORK
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Fig. 16-2713BM (Early Version) Telephone Set, Connections (Sheet 2 of 2)
Page 19

TCI Library- http://www.telephonecollectors.info/
SECTION 502-703-103
LINE 625/610 048U-29
TYPE CONN CORO
BLOO< (NOTE21
T2(BK) Jl ..
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Fig. 17-•2713BM (Current Version) Telephone Set Using 281A Adapter (Sheet 1 of 2)•
Page 20

TCI Library- http://www.telephonecollectors.info/
NETWORK
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ISS 4, SECTION 502-703-103
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Fig. 17-•2713BM (Current Version) Telephone Set Using 281A Adapter (Sheet 2 of 2)•
Page 21

TCI Library- http://www.telephonecollectors.info/
SECTION 502-703-103
LINE WIRE EICM t
RINGER
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Fig. 18-•2713BM (Current Version) Telephone Set Using ElCM Ringer (Sheet 1 of 2)•
Page 22
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