Bell System Practices 851 Leitfaden

BEU

SYSTEM

PRACTICES

TCo

Standard

SECTION

503-601-1

Issue 8, February 1980

851-

AND

2851-

TYPE

TELEPHONE

SETS

IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE

GENERAL

1.01 This section contains information

the

851-

and 2851-type telephone sets.

1.02 This section is reissued

to:

• Add additional ordering information

• Update dial wiring diagram information,

Fig.

and

• Add cable routing in

current

851CM

and

2851CM

telephone sets, Fig.

and

31.

2. IDENTIFICATION

2.01 The

851BM

(MD)

851CM

(rotary dial)

and

2851BM

(MD)

2851CM

(TOUCH-TONE

dial)

are

modular telephone sets with a G15A

handset and H4DU handset cord.

2.02

The

851CM

(rotary

dial)

and

2851CM

(TOUCH-TONE dial) codes are available as

a completely assembled telephone set or a basic

modular telephone set base.

2.03

Purpose:

Provides features of a 6-button

key station (5-line pickup and hold)

wall

installations.

2.04

Application:

Used with central office or

PBX

line circuits in

lA,

1A1, 1A2, or

key telephone systems. Both the

851-

and 2851-type

sets are wired for 1A1,

1A2

, and

systems.

For

KTS,

internal wiring changes must

made.

2.05

Ordering

Guide:

(a)

Telephone

Sets

(Complete):

• Set, Telephone,

851CM-*

(Fig.

• Set, Telephone,

2851CM-*

(Fig.

NOTICE

Fig.

1-851-Type

Telephone Set

(b)

•Telephone

Set

Bases:

• Base, Telephone Set,

851CM

• Base, Telephone Set, 2851CM•

(c)

Modular

Items:

• Faceplate,

852A-*

• Faceplate,

2852A-*

Not for use or disclosure outside the

Bell

System except under written agreement

Printed in U.S.A. Page 1

SECTION

503-60

1-1

Fig.

2-2851-Type

Telephone Set

• Housing,

851A-*

• Handset,

G15A-*

• Cord, Handset, H4DU-*

*Add color suffix from Table

(d) Options:

• Exclusion

• Buzzer

• Station Busy

• Polarity Guard

•

Speakerphone

• Amplifier type handsets

Page 2

• Multiline Conferencing.

(e)

Replaceable

Components:

• Dial, 8RA (rotary service)

• Dial, 35AF3A (TOUCH-TONE service)

• Ringer, P1B

• Key,

635A5

• Buzzer, KS-20419L1

•

812365039

(P-23F503) Key Collar

• Lamp,

51A

(10V)

for all key positions

• All items listed as modular.

TABLE

COLOR

ORDERING

GUIDE

HOUSING,

CORDS

COORDINATED

AND

HANDSET

FACEPLATE

COLOR

SUFFIX

COLOR

SUFFIX

Black

-03

Charcoal

-70

Ivory

-50

Muted Ivory

-80

Green

-51

Light Green

-71

Red

-53

Muted Red

-69

Yellow

-56

Light Yellow

-72

White

-58

Light Gray

-73

Light Beige

-60

Muted Beige

-75

Aqua Blue

-62

Muted Blue

-76

2.06

Design

Features:

• Sets are surface mounted

wall or vertical

surface using holes for

standard

outlet box

or keyhole slots.

• Handset is cradled on top, permitting on-hook

dialing when speakerphone is provided.

• All key

buttons

including hold can be

illuminated (lamps

are

furnished except in

Hold position).

• All pickup buttons convertible to signaling.

•

access hole is provided in the P1-type

ringer for ringer bias spring

adjustment

Refer to Section 501-259-101.

rig.

3-Early

Version 851-Type Telephone

Set

Base

(Housing Removed)

Fig.

4-Early

Version 2851-Type Telephone

Set

Base

(Housing Removed)

ISS

8, SECTION

503-601-101

3. INSTALLATION

3.01

When

mounting

the

851-

2851-type

telephone

set

, select a location which provides

least 6 inches of clearance

all sides to permit

removal of the handset, and for maintenance.

3.02

The telephone

set

should

mounted before

installing the modular items.

expose

the mounting holes, the hinged chassis assembly

must

lowered by loosening the captive screws

(Fig.

10)

holding the top of the chassis. For ease

of installation the chassis assembly can be removed

from the base pan by springing the hinged brackets

sufficiently to clear the pins. The base pan can

then

mounted directly to the wall using the

keyhole slots, or holes provided for mounting over

an electrical outlet

box.

Caution:

void

damage

wall

telephone

set

whenever

chassis

lowered

position.

3.03

All sets except the

codes can be wired

using either inside wiring cable or connector

cable. When mounted over an outlet

box,

bring

wiring through opening in base pan before mounting.

When exposed, bring wiring up from bottom (right

side of handset cord jack). Allow

20-22

inches of

cable inside

set

for routing and terminating.

3.04

With wiring brought into set and base pan

mounted, replace chassis assembly if previously

removed,

but

leave in lowered position.

3.05

Where IW cable is used, prepare and route

as follows.

(1) Remove sheath to surface of outlet box or

bottom of hole in base pan, depending

method of wiring.

(2) Remove cable clamps. Pinch legs of clamp

from front of chassis (Fig.

13).

(3)

Slip one of the clamps provided with set

around conductors approximately 9 inches

from end of sheath. Add second clamp 2 inches

above first.

(4)

Form slack loop as shown

Fig. 7 or 8

and install

first

clamp in hole to left of cord

jack.

Page 3

SECTION

503-601-101

8 12 1

6938

EXCLUSIO

5A5

KEY

KS-8

09L2,

KS-2

0 4

19LI

BUZZER

Fig.

5-2851CM

Telephone Set

th Exclusion (Housing Removed)

(5)

Route cable below jack and install second

clamp in hole to left of ringer.

(6)

Twist ends of conductors together and feed

through opening between dial, ringer, and

connecting blocks.

3.06

all sets except

codes, if the

set

served

the connector equipped end of an

A25B

connector cable, a

D-180375

Kit of

Parts

must

used to obtain raw-ended conductors for

termination. The mated connector and plug should

located as shown in Fig.

Check

that

connector

and plug

not interfere with operation of line

switch. Cable is routed and fastened in same

manner as IW cable (Fig. 7 and

8).

3.07

Check before

terminating

that

sufficient

slack is provided to permit hinging action

of chassis assembly.

Page

Cable

slack

must

area

behind

dial

and

not

touching

ringer.

Chassis

cannot

secured

slack

lies

between

base

pan

and

network

base

pan

and

cord

jack.

3.08

Since individual terminals

are

not designated

the

quick-connect

blocks,

terminal

identification is provided

the inside of the housing

as a wiring guide (Fig.

16).

Terminals 1-30

are

the upper block and 31-54 are on the lower

block. Terminals

51-54

are spare. Use a

714B

tool to terminate conductors.

3.09

The

851CM

and

2851CM

telephone sets

are

equipped

with

a KS-16671Ll

connector

(Fig.

6).

A25B

connector cable is required to

connect set to key equipment (Fig.

and

31).

ISS

SECTION

503-601-101

CONNECTOR

KS-16671

Fig.

6-851CM

2851CM Telephone

Set

Showing KS-16671L1 Mounting

Cord

Connector

Note:

•care

must be exercised

securing

the connector cable to eliminate the possibility

of undue

strain

the conductors and to

prevent damage to

the

insulation of

the

conductors which could cause shorts. Plastic

tie-wraps

should be used to

bundle

the

conductors in order to protect the leads from

being damaged when closing the hinged chassis

.•

3.10

Exclusion

Switch:

provide exclusion,

install the exclusion switch assembly as

follows.

(1)

With chassis in lowered position, fasten

switch assembly to line switch bracket using

screw provided

kit. Screw must

inserted

hole from

rear

of bracket.

(2) Position switch assembly horizontally (Fig. 5

or 10) and fasten securely.

3.11

Polarity

Guard:

When required with

the

2851-type telephone set,

install

the

adhesive backed

819041971

(P-90D197) guard assembly

to the left-hand bracket in the position shown in

Fig.

11.

3.12

3-Type

(MD)

Speakerphone:

These

sets are factory-wired for 3-type speakerphone

except

that

the 851-type telephone

set

requires

the replacement of the 8RA dial with

8CA

dial

to provide a second set of off-normal contacts (P3

and P4 leads). When replacing the dial, the

adapter

brackets must

removed from the 8RA dial and

added to the

8CA

dial (Fig.

12).

With both the

Page 5

SECTION

503-601-101

Fig.

-Inside

Wiring Cable,

Exposed

Wiring (Early

Version)

rotary and TOUCH-TONE sets, a loudspeaker and

transmitter

must

installed external to the

set

and wired to the 55-type control unit. The control

unit can

located near the telephone set (Fig.

21)

the

KTS

equipment.

3.13

Speakerphone:

speakerphone

is provided, the

223D

adapter is recommended,

however, the 82-type adapter also may

used to

interconnect

the

speakerphone components

[680-type

transmitter,

108-type loudspeaker set,

and the

85B1

power unit, (Fig.

and

23)].

3.14 For connections to the 3-type

(MD)

speakerphone system, refer to the appropriate

section

Division

512.

3.15 When an

851-

or 2851-type

set

multipled

with sets furnishing speakerphone features,

certain leads must

disconnected, insulated,

and

stored to avoid interference with working circuits.

The designation of leads to

removed

are

Page 6

Fig.

8-lnside

Wiring Cable, from Outlet

Box

(Early

Version)

follows:

(V-G),

(G-V), P3 or IT (V-BR),

P4 or IR (BR-V),

(V-S), and LK (S-V).

3.16

Buzzer:

The KS-20419L1 buzzer is mounted

an insulated bracket below the dial (Fig.

13).

required, an additional KS-20419L1 may

be added or the existing KS-20419L1 may be

replaced

the KS-8109L2 buzzer (14-30 volt ac

or de) which would be mounted using both screws.

3.17

Station

Busy

Lamp:

A 533K diode is

used to provide a station busy lamp feature

for multibutton wall telephone sets used in

1A1

and 1A2

key

telephone systems.

For connection information, refer to Table

3.18

Key

Features.

•

All

pickup positions of the

635A5

key

are

convertable to signaling

the removal of

the

812857738

(P-28E773) locking pins from

Fig

9-Connector

Cable and

D-180375

Kit

of Parts

(Early Version)

Fig.

10-Exlusion

Switch Installed and Hinged

Chassis

Mounting

Screws

(Early Version)

the

positions

involved

and

making

the

necessary wiring change (Table

C).

•

Lamp

and

set

wiring

are

provided

for

illuminating all key positions, except in

the

ISS

8, SECTION

503-601-101

Fig.

11-Polarity

Guard

Position

Fig.

12-Dial

Adapter Bracket

hold

position

(lamp

must

furnished

separately) where

the

associated

lamp

leads

are

insulated and stored.

• Line appearances on the key can be rearranged

by switching

the

color coded plugs on

the

rear

the

key

rearrangement

the

cross connections

the

key equipment.

•

multiline conferencing option is provided

the 635A5 key

must

be replaced with 635CF5

key, and a

2Al

matrix

block shall be added

the

equipment (Table E), in place of

polarity

guard

described in

paragraph

11.

This

unit

provides

eight

polarity

guard

Page 7

SECTION

503-601-101

CABLE

CLAMP

KS-20419LI

BUZZER

Fig.

13-KS-20419l1

Buzzer

Mounted

on 851-Type

Telephone Set

circuits. One polarity

guard

circuit is

required for each line which is conferenceable

multibutton depression. The polarity

guard is located between the station side

of the line circuit and the station cut-down

field.

3.19

Install H4DB handset cord in

later

production

models of

851-

and 2851-type telephone

sets

inserting the end of the cord having the tapered

plug into the handset and the square end into jack

bottom of set. Spring locking tab should face

away from wall

bottom of set (Fig.

19).

Warning:

Cord

must

removed

from

jack

bottom

set

anytime

chassis

assembly

must

put

lowered

position.

3.20

When installing H4DU handsetcord in

851BM,

851CM,

2851BM,

2851CM

telephone sets,

either end of cord will fit in telephone set base

or handset. The cord should

inserted in the

jack until cord retaining clip locks in place.

Page

3.21 Where conditions

warrant,

the G3A6,

G12A,

G15A

handset supplied with these sets

can

replaced with other types as follows:

•

For

impaired

hearing-G6-type

•

For

weak

speech-G7-type

•

For

noisy

location-G8-type

D-180413.

Note:

Refer

to Section 501-211-102

for

connections of these handsets. An H4CJ or

equivalent handset cord must be used

nonmodular type handsets.

3.22

Installation

Spade-Tipped

Handset

Cords

Early

Production

Sets

Equipped

With

G12A

Handset

(Fig.

14):

install spade-tipped handset cord (H4CJ or

equivalent) remove J hook stayband from the cord.

Cut back and remove cord sheath to stayband

marks. Thread spade-tipped conductors through

plug, ordered separately, (spade tips must

bent

to clear cord entrance). Pull cord until about

1/4-inch of cord sheath is in the central cavity of

the plug. Separate the conductors into two groups

and tie an overhand knot, pulling the knot to the

cord sheath. Pull cord from plug until

strain

relief

position is attained

knot entering sheath and

resting against plug. Feed spade-tipped conductors

straight through jack and connect to proper terminals.

Insert

plug in jack.

3.23

Installation

Spade-Tipped

Handset

Cords

851BM,

851CM,

2851BM,

and

2851

Telephone

Sets:

install

spade-tipped handset cord (H4CJ or equivalent)

insert

J hook stayband of cord in slot provided in

base of telephone

set

and

terminate

appropriate

network terminals (Fig.

26, 27, 28,

29).

3.24

install

housing.

(1)

Refer to paragraph

5.05.

(2)

chassis assembly is in lowered position,

raise and fasten in place with two captive

screws.

(3)

Install collar

key.

(4)

Withdraw the two mounting screws until

they

are

held in the housing

their

threads.

840217590

PLUG

Fig.

14-lnstalling

Spade-Tipped Handset Cords in

Early Production

851-

and

2851-

Type

Telephone

Sets

with

G12A

Handset

With both line switch plungers fully lifted, move

the housing directly into position around the

telephone set (if an exclusion switch is installed,

the left plunger will touch the exclusion switch

when the housing is about 3/8-inch from the

base). Depress both plungers to

their

on-hook

position. Continue working the housing into

position against the base. Release plungers.

(5)

Fasten housing in place with two captive

screws.

(6) Check complete operation of line switch and

exclusion feature.

3.25

Use Form E-5002-A or E-5002-B as a station

number card for a TOUCH-TONE station

and Form E-4203-G for rotary sets.

3.26

Install

Faceplate.

(1)

Insert

tabs

faceplate into slots of housing.

Use a

KS-21107

type releaser or equivalent

to depress the tab of the faceplate

retainer

clip

while seating the faceplate.

insure proper

positioning of the retainer clip, raise the handle

ISS

8, SECTION S03-601-101

of the releaser well above horizontal, as shown

in Fig.

before withdrawing the tool.

(2)

installing

2851A

faceplate

(2851-type

telephone set) place station number card in

from

front

of faceplate in

standard

manner.

(3)

installing

2852A

faceplate, an

840693253

adapter

(furnished) is used to retain the

station number card. Install

adapter

in faceplate

with the two retaining tabs toward the top of

the faceplate. Check for proper seating of

adapter.

(

the latchingcharacteristics of the

802695247

(P-269524)

retainer

clip is inadequate, replace

Fig.

IS-Installing

851A(MD)

852A

Faceplate

3.27

The

635A5

key uses an E-5837 form (key

button designation tabs).

install, squeeze

sides of cap to remove from key button and

insert

designation tab. When replacing cap or key button

Page 9

SECTION

503-601-1

make sure assembly snaps into place.

cap does

not snap in place properly,

rotate

degrees.

4. CONNECTIONS

4.01 For setsequipped with a 66S1-type connecting

block, terminate IW cable as shown in Fig.

and

using the terminal identification information

inside the housing as a guide in locating terminal

numbers (Fig.

16)

Fig.

16-Connecting

Block

Terminal Information

4.02

All leads or

straps

involved in service or

option changes

are

equipped with spade

tips.

not factory terminated, leads are insulated

and stored.

4.03

For

sets

equipped with

the

KS-16671L1

connector, (Fig.

A25B

connector cable

is required.

4.04

Connection

Index:

Table B- Connections for

KTS

and/or

Station

Busy Lamp

Page 10

Table

C-Pickup-Signal

Key Conversions

Table

D-Polarity

Guard

Connections

for

2851-Type Telephone

Set

[819041971

(P-90Dl97) Guard Assembly)

Table

E-2A1

Matrix Block Connections

Fig.

24-Exclusion

Switch Connections

Fig.

25-Hold

Lamp Connections

Fig.

26-851BT,

851B,

851BM Telephone

Set, Connections

Fig.

-2851BT,

2851B,

2851BM

Telephone

Set, Connections

Fig. 28-851CM Telephone Set, Connections

Fig. 29-2851CM Telephone Set, Connections

5. MAINTENANCE

Maintenance replacement should

limited

to the following:

• Complete telephone sets

• Modular items

• Optional items

• Replaceable components.

5.02 When dial replacement is necessary in the

851-type telephone set, use an 8RA dial for

nonspeakerphone sets and an

8CA

dial for sets with

speakerphone. Remove dial by loosening adapter

mounting

screws

and

springing

dial

brackets

sufficiently to release dial from locating pins.

Tran~fer

adapter

brackets from dial being replaced

to new dial (Fig. 12).

5.03 Maintenance of the 35-type TOUCH-TONE

dial is not recommended and the dial should

replaced. Adapter brackets

are

not involved

when replacing the TOUCH-TONE dial.

When necessary to remove housing,

the

faceplate must

first

removed by using a

KS-21107 type releaser or equivalent in catch in

bottom of faceplate. Housing can then be removed

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