At&t 761b pbx Guide

BELL

SYSTEM

PRACTICES

AT

&

T~,.

Standard

"-<1Se

SECTION

551-720-210

Issue

3,

March

1979

SWITCHING

CABINET

IDENTIFICATION,

INSTALLATION,

AND

CONNECTIONS

761B

PBX

CONTENTS

1.

GENERAL

2.

PBX

ORDER

BLANK

3.

IDENTIFICATION

4.

TOOLS

5. PLANNING

6. UNCRATING

7.

INSTALLATION

Installation

of

Equipment

Soundproofing

Cabinet

Front

and

End

Panels

8.

GROUNDING

9.

CONNECTIONS

Figures

1.

Envelope

Holder

Installed

2. 761B

PBX

Switching

Cabinet

3.

Switching

Cabinet

Equipment

Arrangement

PAGE CONTENTS PAGE

7.

761B

PBX

Crown-Location

of

Screw

for

Ground

13

2 8.

761B

PBX

Crown-

Vertical

Quick-Connect

2

Terminal

Field

13

2

9.

761B

PBX

Crown-Terminal

Fields Raised

14

5 10.

Method

of

Mounting

Cable

Clamps

16

6

Tables

6 A.

761B

PBX

Switching

Equipment

3

B.

761 B

PBX

Capacity

9

6 C. Equipment Connections to Slide Connectors

9

10

9

5

D.

Trunk

Connections

from

House

and

Feeder

to

PBX

15

1.

GENERAL

1.01

This section provides

information

for

the

identification, installation,

and

connections

for a 20- to 40-station line

761B

PBX switching

equipment

cabinet

arranged

for

either

rotary

or

TOUCH-TONE@ dialing operation.

7

1.02

This section is reissued to:

4.

Floor

Space

Requirements

for 761 B

PBX

9 • Add mechanized

ordering

information

5.

Slide

Stop

Assembly

in Place 9

6.

Installation

of

Soundproofing

on

Panels

13

• Add reference to service options section

NOTICE

Not for use

or

<lisrlosure outside the

Bell System except

under

written

agreement

Printed

in U.S.A.

Page

1

TCI Library https://www.telephonecollectors.info/

SECTION

551-720-210

e Add notes to Table A to clarify equipment

requirements

e Add cabinet soundproofing

e Make minor changes.

Since

this

reissue is a general

rev1s10n,

arrows

ordinarily

used to indicate

changes

have been

omitted.

1.03 For identification, installation, and connections

of

attendant

and

station

equipment,

refer

to Section

551-

722-210.

1.04

For

method of providing service options,

refer to Section 551-722-210.

1.05

For

a general description of

the

761B

PBX,

refer to Section 981-669-100.

1.06 The

761B

PBX is a common control PBX

system employing crossbar switching and

consists of one switching cabinet, one

attendant

console, and a maximum of

40

station

telephone

sets. The system is primarily used to provide dial

telephone service

at

small hotels

and

motels

and

contains its own batteryless power plant.

1.07 A set of schematic drawings and circuit

description sheets

are

furnished

with the

switching equipment. An envelope holder assembly

(ED-1E037-70, group

7)

is available for

storing

these

drawings in

the

front

panel (Fig. 1).

1.08 This issue of

the

section is based on

the

following drawing:

SD-1E060-0l, Iss

25

If

this

section is to be used with equipment

or

apparatus

reflecting

later

issues of

the

drawing,

reference should be made to

the

SD to determine

the

extent

of the changes and

the

manner

in which

the section may

be

affected.

2.

PBX

ORDER

BLANK

2.01 When ordering a

761B

PBX,

Form

E-8077

should be prepared. The form provides the

data

necessary for the mechanized ordering system

for a new pre-assembled

761B

PBX system.

Page 2

2.02

Form

E-8077 can only be used

for

ordering

one new pre-assembled

761B

PBX (including,

if

desired,

attendant

call, answer

and

switching

console, and Al25A connector cable).

Any

additions

to

existing systems

must

be ordered separately.

2.03

The

form

establishes

the

rotary

or

TOUCH-TONE operation with

or

without

digit absorbing service features along with

the

identity

and

quantity

of required

units

for the

ordered

system.

2.04

So

that

appropriate

strapping

may be factory

installed, th2 following

are

identified:

3.

(a) The PBX

stations

tens digits assignment.

(b) Three-digit

unrestricted

codes

for

the code

check unit.

(c) A PBX served by a step-by-step

central

office

arranged

for digit absorbing in a

"O"

and

"l"

access area, the following information

about

the

central

office

must

be provided:

• Office codes served

e Service codes served

e Digit absorbing selector switch arrangements.

(d) Referenced papers, general notes, and installer

notes may be included on

the

form.

IDENTIFICATION

3.01 The basic

761B

PBX switching equipment

for both

rotary

and TOUCH-TONE dial

operation

is listed by J numbers in Table

A.

All

of

the

equipment is installed in the switching cabinet

(Fig. 2)

on

three

slides.

The

possible

slide

arrangements

are

shown in Fig.

3.

3.02 The capacity of

the

761B

PBX

1s

shown in

Table

B.

4.

TOOLS

4.01 In addition to

standard

PBX

installation

tools, the following tools

or

their

equivalent

are

required:

(a) 714-type tool for

making

connections to

quick-connect blocks

TCI Library https://www.telephonecollectors.info/

ISS

3,

SECTION

551-720-210

TABLE

A

761B PBX SWITCHING EQUIPMENT

EQUIPMENT

CODE

DESCRIPTION

AND

FUNCTION

J58862A

Switching

cabinet

equipped

with

three

slides

and

containing

equipment

for

20

sta-

List 1

tion

lines,

one

common

control

unit,

two

intra-PBX

trunks,

one

power

supply,

and

one

fuse panel.

J58862AA

Fuse

panel

unit.

List 1

J58862AB

Crossbar switch

and

relay

unit

for

10

station

lines.

List 1

J58862AC

Common

control

unit.

List 1

J58862AD

Intra-PBX

trunk

unit

required

to

connect

room-to-room

or

room-to-desk

calls via

List 1

the

attendant.

J58862AE

2-Way CO

ground

ring

start

trunk

with

station

message registration via sleeve.

List 1

J58862AF

Rotary

dial

remote

answer

unit,

providing

trunk

answer

from

any

station.

List 1

J58862AG

TOUCH-TONE dialing

remote

answer

unit,

providing

trunk

answer

from

any

station.

List 1

J58862AH

Toll

operator

trunk

unit

required

for

each toll

central

office

trunk.

List 1

J58862AJ

Rotary

dial pulse

counting

and

register

unit.

List 1

J58862AK

Rotary

dial 0

and

1 first digit

nondigit

absorbing call

controller

and

tone

unit.

List 1 (See Notes 1

and

2).

J58862AL

Rotary

dial

nondigit

absorbing

call

controller

2nd

and

3rd

digit

and

tone

unit.

List 1 (See

Note

2.)

J58862AM

Code

check

unit

required

when

system

is arranged

for

3-digit

nondigit

absorbing

List 1 call

controller.

(See

Notes

2

and

3.)

J58862AM

Diode

circuit

pack

for

eighteen

3-digit codes

to

be passed

(maximum

6). (See

List 2 Notes 2

and

3.)

J58862AN

2-Way

CO

ground

ring

start

trunk

with

station

message

registration

via sleeve

List 1

and

toll diversion

by

CO reversal

of

battery.

J58862AP

2-Way

CO

ground

ring

start

trunk

with

station

message

registration

via

battery

List

1 reversal

from

the

CO.

Page 3

TCI Library https://www.telephonecollectors.info/

SECTION

551-720-210

TABLE

A (Contd)

7618

PBX SWITCHING EQUIPMENT

EQUIPMENT

CODE

DESCRIPTION

AND

FUNCTION

J58862AR

TOUCH-TONE dial 0

and

1 first digit

nondigit

and

digit absorbing call

controller

List 1

and

tone

unit.

(See

Notes

1,

3,

and

5.)

J58862AS

TOUCH-TONE dial

nondigit

absorbing

call

controller

register

unit.

(See

Note

3.)

List 1

J58862AT

Rotary

dial digit

absorbing

call

controller.

(See

Note

4.)

List 1

J58862AU

TOUCH-TONE dial

digit

absorbing call

controller.

(See

Note

5.)

List 1

J58844A

List 1 (MD) TOUCH-TONE receiver

unit

-

two

required

when

system

is arranged

for

J58844B

TOUCH-TONE call

controller

operation

-

one

required

for

TOUCH-TONE opera-

List 1

tion

without

call

controller.

J86831A

List 1 (MD)

Power

supply

and

ringing

tone

unit.

J86878.A

List 1 (MD)

List 2

Note

1:

When single digit call

controller

without

digit

absorbing

is

provided,

one

1st

digit register

and

tone

unit

is

required

per

central

office

trunk.

Note

2: When 3-digit call

controller

without

digit

absorbing

for

rotary

dial

operation

is

provided,

one

1st

digit register

and

tone

unit

and

one

2nd

and

3rd

digit register

and

tone

unit

are

required

per

trunk;

one

code

check

unit

is

required

per

system.

In

addition,

one

diode

board

(CPU)

is

required

per

18

codes

to

be passed.

Note

3: When 3-digit call

controller

without

digit

absorbing

for

TOUCH-TONE

operation

is

provided,

one

TOUCH-TONE

"O"

&

"1"

1st

digit call

controller

and

tone

unit

is

required

per

central

office

trunk;

one

TOUCH-TONE 3-digit call

controller

register

unit

and

one

code

check

unit

is

required

per

system.

In

addition,

one

diode

board

(CPU) is

required

per

18

codes

to

be passed.

Note

4: When digit

absorbing

call

controller

with

rotary

dial

operation

is

provided,

one

digit

absorbing

dial pulse call

control

unit

is

required

per

CO

trunk.

Note

5:

When digit

absorbing

call

controller

with

TOUCH-TONE

operation

is

provided,

one

1st

digit

register

and

tone

unit

is

required

per

CO

trunk;

one

digit

absorbing

TOUCH-TONE call

control

unit

is

required

per

system.

Page 4

TCI Library https://www.telephonecollectors.info/

PANEL

.

EN

VELO

HOtDER

PE

TPA

5121

28

\

I'._

~

..

·,

\

~

v

/-.

Fig. I

-Envelope

Holder Installed

(b) R-1257 bench level

(

c)

R-2384 pinch

bar

(30-inch)

/

..

'

j

'\

-~

(d) 19/32 wrench for removing slide stop assembly

hex-nut

(e) Nail puller.

5. PLANNING

5.01 The floor space

requirement

for

the

7G1B

PBX

and

the

required

maintenance

space

are

shown in Fig.

4.

Space shown

at

the

front

of

the

cabinet

may

be aisle space.

ISS

3,

SECTION

551-720-210

Fig.

2-761

B

PBX

Switching

Cabinet

5.02

A

fully

equipped cabinet weighs approximately

800 pounds. However,

the

cabinet

weight

will

vary

according to

the

equipment

installed.

Caution:

Prior

to

installation

of

the

761B

PBX

equipment,

it

must

be

Page

5

TCI Library https://www.telephonecollectors.info/

SECTION

551-720-210

determined

that

the

load

carrying

capacity

of

the

floor

is

adequate.

5.03

For

selection of location of the switching

cabinet,

ref

er

to Section 809-002-100.

6. UNCRATING

6.01 The cabinet is packed

and

shipped in a

normal

upright

position,

enclosed

in

a

polyethylene bag. A floating

arrangement,

consisting

of a polyfoam collar

at

the top and bottom of

the

cabinet, is used to secure the cabinet within

the

crate. The cabinet is secured to the shipping skid

by four bolts. The quick-connect block frames

are

secured in a lowered position for shipping. The

side panels

are

packed and shipped separately.

6.02 The shipping container measures 6 feet 3-1/8

inches in height,

has

a maximum width of

29-1/2 inches, and weighs approximately

135

pounds.

The

container

is

marked

with

the

J code

and

list

number

of the enclosed cabinet.

6.03 Place the cabinets as

near

as possible to

the

designated installation

area

and

uncrate

according to the procedure

attached

to the shipping

crate.

Immediately

destroy

the

polyethylene

bag

when

removed

from

the

cabinet.

Remove

the

four bolts securing the cabinet to

the

skid.

Caution:

The

top

is

not

fastened;

therefore,

care

should

be

taken

when

positioning

the

cabinet.

7. INSTALLATION

7.01 Remove cabinet from skid and locate m

installation

area

as shown in Fig.

4.

7.02

To

prevent damage in shipping, each slide

is secured in

the

cabinet with a slide stop

bolt assembly consisting of one P-160126 hex-head

cap screw, two P-284160

flat

washers, and one

P-154248 hex nut.

These

assemblies

must

be

removed

before

the

slides

can

be

withdrawn

from

the

cabinet.

Retain these

items for future use when

it

is necessary to relocate

or replace

the

cabinet. (See Fig.

5.)

7.03 Level the cabinet.

If

necessary, shim

the

base of

the

cabinet with small

strips

of

hardwood,

or

equivalent. A sufficient

number

of

Page

6

shims

should be used to equalize

the

weight

distribution along

the

base area.

7.04

Four

holes

are

located in

the

bottom of the

PBX cabinet for use when

it

is necessary

to fasten the cabinet to

the

floor. Secure

the

cabinet according to local instructions and job

requirements.

If

a rigid mounting is not required,

insert

P-40G472 plug buttons into the four holes.

Installation of

Equipment

7.05 When equipment

other

than

that

furnished

with

the

cabinet is required, mount the

additional equipment on slides

1,

2,

or 3 in positions

shown in Fig.

3.

Plug the equipment plugs into

the

slide connectors (Table

C),

as

required.

Optional

features

and

provision

for

lead

continuity

are

required

for

proper

system operation. See Section 551-728-210

for

method

of

application.

7.06

Ensure

that

all plugs being used

are

secure

in

their

respective jacks.

Soundproofing

Cabinet

Front

and

End Panels

7.07

If

the

switching cabinet is to be placed in

a location where equipment noise will be a

problem, proceed as indicated in

paragraphs

7.08

through

7.10.

7.08 Soundproofing kits are available

on

an optional

basis for soundproofing

the

front

and end

panels of

the

cabinet. One

kit

is required for each

panel to be soundproofed. The kit consists of

two adhesive-backed polyurethane foam

tape

panels

24-1/2 inches long by 18-1/2 inches wide by

1/2

inch thick.

7.09

Install

the

soundproofing

material

as follows:

(a) Remove

front

and end panels from

the

cabinet and place in a horizontal position

with the inside up.

(b) Clean inside of panel

(dust

free).

(c)

Place the exposed adhesive of two polyurethane

foam

tape

panels on

the

center of each

cabinet panel and press firmly. (See Fig. 6.)

(

d)

Replace panels on the cabinet.

TCI Library https://www.telephonecollectors.info/

POWER

SUPPLY

AND

RINGING TONES

J86831A-(

)MD

J86878A-{

)

SPARE

FUSE PANEL

J58862AA-(

)

2-WAY

L CENTRAL

(7)-

~TOR

OFFICE

-OR-

TRUNK

~K

J58862AE

-(

);--

~H-(

)

J58862AN-(

),

OR

(6)-

J58862AP-(

)

LINE

AND

SWITCH

UNIT

J58862AB-(

)

'OR LINES

20-29

LINE

AND

SWITCH

UNIT

J58862A8-

( )

FOR

LINES 0 - 9

SLIDE

NO.

I

-

(5)

(4)

TOLL

OPERATOR

TRUNK

J58862AH-{

2-WAY

CENTRAL

-OR-

OFFICE

TRUNK

J58862AE-(

)~

3

)

J58862AN-{

),

OR

J58862AP-(

(2)

{I)

2-WAY

CENTRAL OFFICE TRUNK

J58862AE-{

)

(0)

J58862AN-(

)

OR

J58862AP-(

)

LINE

AND

SWITCH

UNIT

J58862AB-(

)

FOR

LINES

30

-39

LINE

AND

SWITCH

UNIT

J58862AB-(

)

FOR

LINES

10

-19

SLIDE

NO.

2

CODE

CHECK

UNIT

J58862AM-(

SECOND AND

THIRD

DIGIT REGISTER

AND TONE UNIT

J58862AL-(

)

FIRST DIGIT

REGISTER

AND

TONE

UNIT

J58862AK-(

)

REMOTE ANSWER

UNIT

J58862AF-

( )

DIAL PULSE COUNTING

AND

REGISTER UNIT

J58862AJ-(

)

SPARE

COMMON

CONTROL

J58862AC-{

INTRA-PBX

TRUNK

J58862AD-{

)

INTRA-PBX

TRUNK

J58862AD-{

)

SLIDE

NO.

3

ARRANGED

FOR

ROTARY DIAL PULSING

WITHOUT DIGIT

ABSORBING

CALL CONTROLLER

(5)

(4)

(3)

(2)

(I)

(0)

(5)

(·')

(3)

(2)

(I)

(O)

(I)

(O)

CODE

CHECK

UNIT

J5B862AM-(

"TOUCH-TONE"

3-DIGIT

CALL

CONTROLLER

REGISTER

UNIT

J

58862AS-(

)

SPARE

"TOUCH-TONE"

"O"

8

"I"

IST DIGIT

CALL

CONTROLLER

AND TONE

UNIT

J

58862

AR-(

)

"TOUCH-TONE"

ACCESS

AND REMOTE

ANSWER

UNIT

J58862AG-(

)

"TOUCH-TONE"

RECEIVER

COMMON

CONTROL

J58862AC-(

)MD

I

INTRA-PBX

TRUNK

J58862

AD-(

)

INTRA-PBX

TRUNK

J58862AD-(

)

SLIDE

NO.

3

ARRANGED

FOR

TOUCH-TONE CALLING

WITHOUT DIGIT

ABSORBING

CALL CONTROLLER

(5)

(4)

(3)

(2)

(I)

(0)

(I)

(0)

(2)

{I)

(0)

SPARE

DIGIT ABSORBING

DIAL

PULSE

CALL CONTROLLER

UNIT

J58862AT-(

)

REMOTE ANSWER UNIT

J58862AF-(

)

DIAL

PULSE COUNTING

AND REGISTER

J5B862AJ

- (

SPARE

COMMON

CONTROL

J5BB62AC-(

INTRA-PBX

TRUNK

J58862AD-{

)

INTRA-PBX

TRUNK

J5B862AD-{

)

SLIDE

NO.

3

ARRANGED

FOR

ROTARY DIAL PULSING

WITH DIGIT ABSORBING

CALL

CONTROLLER

(5)

(4)

(3)

(2)

(I)

(O)

(2)

(I)

(0)

SPARE

-TONE"

IST DIGIT

CALL CONTROLLER

AND

TONE

UNIT

J58862AR-(

)

"TOUCH TONE" ACCESS

AND

REMOTE ANSWER

UNIT

J58862AG-(

)

"TOUCH

-TONE"

RECEIVER

J58844A-(

)

MD

J588448-(

)

COMMON

CONTROL

J58862AC-(

INTRA-PBX

TRUNK

J58862AD-(

)

INTRA-PBX

TRUNK

J58862AD-(

)

SLIDE

NO.

3

ARRANGED

FOR

TOUCH-TONE

CALLING

WITH

DIGIT

ABSORBING

CALL

CONTROLLER

(5)

(4)

(3)

(2)

(I)

(O)

(I)

(0)

(2)

(I)

(O)

26

25

24

23

22

21

20

19

IB

17

16

15

14

13

12

10

9

8

7

6

5

4

3

2

ISS

3,

SECTION

551-720-210

NOTES:

I.

EQUIPMENT SUPPLIED WITH THE SWITCHING CABINET

IS

SHOWN

ENCLOSED

BY

HEAVY LINES AND

WILL

BE

USED

FOR

20-STATION

OPERATION.

2.

EQUIPMENT

NOT

SHOWN

ENCLOSED

BY

HEAVY

Lll\IES

MUST

BE ORDERED

SEPARATELY

AND

INSTALLED.

HOWEVER, EQUIPMENT

ORDERED

USING

MECHANIZED

ORDER

BLANK

FORM

E-8077

FOR

NEW

PREASSEMBLED

7618

PBX

SYSTEM

WILL

HAVE

THIS EQUIPMENT

INSTALLED

AND

WIRED

IN

ACCORDANCE

WITH

DATA

PROVIDED

ON

THE

FORM.

3.

EACH CROSSBAR SWITCH ACCOMMODATES 10

STATIONS.

4.

ALL

UNITS ARE

PLUG-IN

UNITS.

5.

NUMBERS IN ( ) INDICATE EQUIPMENT

POSITIONS

FOR

UNITS WHERE MORE

THAN

ONE

OF

SAME

TYPE

MAY BE EQUIPPED.

6.

CENTRAL OFFICE TRUNKS MUST BE

EQUIPPED

STARTING WITH LOWEST NUMBERED

POSITION,

FIRST

TRUNK

WILL

BE

IN

POSITION

0.

7. TOLL OPERATOR

TRUNKS

MUST

BE

EQUIPPED STARTING

WITH HIGHEST NUMBERED POSIJ'ION. HOWEVER, FIRST

TRUNK

WILL

BE

THAT

WHICH. IS

LOCAT<ED

IN

THE

LOWEST NUMBERED

POSITION.

8.

WHEN"TOUCH-TONE"OPERATION

IS REQUIRED

AND

THE

PBX

IS

NOT REQUIRED,

ONLY ONE

RECEIVER

IS

USED.

9. ONLY

THE

FIRST SIX TRUNK POSITIONS ARE

ARRANGED

FOR

CONNECTION

TO

FIRST DIGIT,

SECOND DIGIT AND THIRD

DIGIT

REGISTER AND

TONE CIRCUITS.

10.

CALL

CONTROLLER POSITIONS 0 THROUGH 5 IN

SLIDE 3 ARE

TRUNK POSITIONS 0

THROUGH 5

RESPECTIVELY

IN

SLIDE

2.

Cabinet

Arrangement

7/8

TCI Library https://www.telephonecollectors.info/

POWER

SUPPLY

AND

RINGING TONES

J86831A-(

)MD

J86878A-(

)

SPARE

FUSE PANEL

J58862AA-()

2-WAY

I-

TOLL

CENTRAL

(7)-

OPERATOR OFFICE

,__

TRUNK

-OR-

TRUNK -

J58862AH-(

)

J58862AE-(

),

J58862AN-(

),

I-

OR

(6)-

J58862AP-(

)

LINE

AND

SWITCH

UNIT

J58862AB

-(

)

FOR

LINES

20-29

,___

-

,__

-

LINE

AND

SWITCH

UNIT

J58862

AB-

( )

FOR

LINES

0-9

...__

-

>---

-

SLIDE

NO.

I

(5)

(4)

TOLL

OPERATOR

TRUNK

J58862AH-(

2-WAY

CENTRAL

-OR-

OFFICE

TRUNK

J58862AE-(

J\

3l

J58862AN-(

),

OR

J58862AP-(

(2)

(I)

2-WAY

CENTRAL OFFICE TRUNK

J58862AE-(

)

(0)

J58862AN-(

)

OR

J58862AP-(

)

LINE

AND

SWITCH

UNIT

J58862AB-(

l

FOR

LINES

30

-39

LINE

AND

SWITCH

UNIT

J58862AB-(

)

FOR

LINES

10-19

SLIDE

NO.

2

CODE

CHECK

UNIT

J58862AM-(

SECOND AND TH I

RD

DIGIT REGISTER

AND TONE UNIT

J58862AL-(

)

FIRST DIGIT

REGISTER

AND

TONE

UNIT

J58862AK-(

)

REMOTE ANSWER

UNIT

J58862AF-

( )

DIAL

PULSE COUNTING

AND

REGISTER UNIT

J58862AJ-I

)

SPARE

COMMON

CONTROL

J58862AC-(

INTRA-PBX

TRUNK

J58862AD-(

)

INTRA-PBX

TRUNK

J58862AD-(

)

SLIDE

NO.

3

ARRANGED

FOR

ROTARY DIAL PULSING

WITHOUT DIGIT

ABSORBING

CALL CONTROLLER

(5)

(4)

(3)

(2)

(I)

(0)

(5)

{·')

(3)

(2)

(I)

(0)

(2)

(0)

CODE

CHECK

UNIT

J58862AM-(

"TOUCH-TONE"

3-DIGIT

CALL

CONTROLLER

REGISTER UNIT

J

58862AS-(

)

SPARE

IST DIGIT

CALL

CONTROLLER

AND TONE

UNIT

J58862AR-(

)

"TOUCH-TONE"

ACCESS

AND REMOTE ANSWER

J58862AG-(

)

"TOUCH-TONE"

RECEIVER

)

MD

)

COMMON

CONTROL

J58862AC-(

INTRA-PBX

TRUNK

J58862AD-(

)

INTRA-PBX

TRUNK

J58862AD-(

)

SLIDE

NO.

3

ARRANGED

FOR

TOUCH-TONE CALLING

WITHOUT DIGIT

ABSORBING

CALL CONTROLLER

(5)

(4)

(3)

(2)

( )

(0)

(I)

(0)

(2)

(I)

(O)

SPARE

DIGIT ABSORBING

DIAL

PULSE

CALL CONTROLLER

UNIT

J58862AT-(

)

REMOTE

ANSWER

UNIT

J58862AF-(

)

DIAL

PULSE COUNTING

AND REGISTER

J58862AJ-

{

SPARE

COMMON

CONTROL

J58862AC-{

INTRA-PBX

TRUNK

J58862AD-(

)

INTRA-PBX

TRUNK

J58862AD-(

)

SLIDE

NO.

3

ARRANGED

FOR

ROTARY DIAL PULSING

WITH DIGIT ABSORBING

CALL

CONTROLLER

(5)

(4)

(3)

(2)

(I)

(O)

(2)

(I)

(O)

Dll

"1

CALL

C

"T

none

CAL

A~

J

11

TOU1

AND

J!

"T

R

J

c

J

INT

J!

INT

J!

ARRANGE

CALI

AB

(

TCI Library https://www.telephonecollectors.info/

TABLE

B

761

B PBX

CAPACITY

EQUIPMENT

MIN

MAX

Central office

trunks

O*

8*

Toll

operator

trunks

O*

8*

Intra-PBX

trunks

2 3

Remote

answer

trunk

1 1

PBX

station

lines 20 40

Call controllers 0 6

Attendant

console 1 1

*

The

761B PBX

is

equipped

with

eight

universal

trunk

positions.

Any

combination

of

central

office

and

toll

trunks

may

be

used

in

these

positions.

CABINET

FINISHED WALL

LINE

OR

OTHER

OBSTRUCTION

I IN. MIN I IN. MIN

MOVABLE

OBSTRUCTION

30

IN.

---M

27

IN_-_...,,.,

FINISHED WALL

LINE

OR

OTHER OBSTRUCTION

NOTES:

MOVABLE

OBSTRUCTION

M

I.

DIMENSION M IS

SPACE

REQUIRED DURING MAINTENANCE AND

SHOULD NOT

BE

LESS THAN 2

FEET

6 INCHES

2. HEIGHT

IS

68

INCHES WITH TOP

IN

PLACE;

74

I

NCH

ES

WITH TOP

REMOVED

AND

THE

HINGED

FRAME

IN A

VERTICAL

POSITION.

Fig.

4-Floor

Space

Requirements

for 761 B

PBX

ISS

3,

SECTION

551-720-210

Fig.

5-Slide

Stop Assembly in Place

7.10

To receive

the

soundproofing kit, order as

follows:

One

soundproofing installation kit-ED-1E037-

70

Group

10.

8. GROUNDING

8.01

Ground

for

the

cabinet is

normally

furnished

by

the

third

wire in

the

power cord.

To

ensure

that

the

cabinet

remains

grounded when

the

power cord is removed,

an

approved local

ground

must

be provided.

8.02

Remove

the

sliding top of

the

switching

cabinet

and

store

in a safe place. Remove

a screw

at

the

left

rear

of

the

crown and clean

the

surface

beneath

the

screw head to

bright

metal.

(See Fig. 7.) Using locally

furnished

wire (18-gauge

minimum)

and

a suitable

terminal

lug, connect a

ground

lead from

the

PBX

ground

screw to

an

approved ground. Refer to Section 802-001-180

for method of providing an approved ground.

9. CONNECTIONS

9.01 Quick-connect

terminal

blocks

are

provided

in

the

crown of the switching cabinet for

connecting

the

PBX stations,

attendant

console,

trunks,

and

remote

answer

bell. The quick-connect

field faces

the

front

of

the

PBX

cabinet

as shown

in Fig. 8

and

9.

Page

9

TCI Library https://www.telephonecollectors.info/

SECTION

551-720-210

TABLE

C

EQUIPMENT CONNECTIONS TO

SLIDE

CONNECTORS

s

CONNECT

TO

L

I

NOTES

D

SLIDE

MTG

PLT

E

EQUIPMENT

PLUG

CONN

LOCATION

Note

N

17-18

M

1

CO

trunk

unit

Each

type

of

CO

trunk

has 2 plugs as follows:

Note

N

15-16

M

Note

N 25-26

J58862AE

NO

M

MCO

Note

N 23-24

J58862AN

Nl

M

MCl

Note

N 21-22

M

2

CO

trunk

unit

J58862AP

N2

Note N

19-20

MC2

M Plug

the

N-

and

M-

plug

of

the

required

trunk

Note

N

17-18

into

the

respective N

and

M

connector

of

each

M

trunk

position as required.

I

Note N 15-16

M

1 Toll

operator

MT M

17-18

trunk

unit

MT M

15-16

MT M 25-26 Slide

connector

N requires no plug when

MT M 23-24

toll

operator

trunks

are used.

2 Toll

operator

MT M 21-22

trunk

unit

MT M 19-20

MT

M

17-18

MT M 15-16

Page 10

TCI Library https://www.telephonecollectors.info/

ISS

3,

SECTION

551-720-210

TABLE

C (Contd)

EQUIPMENT CONNECTIONS TO

SLIDE

CONNECTORS

s

CONNECT

TO

L

I

NOTES

D

SLIDE

MTG

PLT

E

EQUIPMENT

PLUG

CONN

LOCATION

Line switch c c

1

and

relay

unit

D D 8-14

Required

for PBX

station

lines 20-29.

E E

Line

switch

c c

2 D D 8-14

Required

for

PBX

stations

30-39.

and

relay

unit

E E

Code

check

T T 24-26

Required

for

3-digit

nondigit

absorbing

unit

call

control

witji

rotary

dial pulsing.

8(5)

~J

-S

23

2nd

and

3rd

S(4) 22

digit register

8(3)

:J

-s 21

Required

for

3-digit

nondigit

absorbing

8(2)

20

with

rotary

dial pulsing for

each

and

tone

unit

S(l)

~J

19

central

office

trunk

position.

S(O) -s

18

R(5)

~J

-R

17

R(4)

16

1st

digit

R(3)

~]

-R

15

Required

for

single digit

nondigit

register

and

R(2)

14

absorbing call

control

with

rotary

dial

tone

circuit

R(l)

~J

-R

13

pulsing for

each

central

office

trunk

R(O)

12

position.

Dial pulse

remote

answer

J J

10-11

Required

for

remote

answer

feature.

unit

3 Dial pulse

counting

and

K K 9

Required

for

rotary

dial

operation.

register

unit

Intra-PBX L L 3

3rd

intra-PBX

trunk.

trunk

unit

TOUCH-TONE

3-digit call WT w 20-23

Required

for

3-digit

nondigit

absorbing

controller

and

ST

(5)8

call

control

with

TOUCH-TONE calling.

register

unit

TOUCH-TONE

Required

for

remote

answer

with

access

and

JT

J TOUCH-TONE calling.

KT

K 9-11

Connect

plugs

NTO

and

NTl

as

remote

answer

VT v

required

to

connectors

on

TOUCH-

unit

TONE

calling receivers 0

and

1

respectively.

Page

11

TCI Library https://www.telephonecollectors.info/

SECTION

551-720-2l0

TABLE

C (Contd)

EQUIPMENT CONNECTIONS TO SLIDE CONNECTORS

s

CONNECT

TO

L

I

D SLIDE

E

PLUG

CONN

RT

i]

-R

TOUCH-TONE

RT

0

and

1 call

RT

controller

and

RT

-R

tone

unit

RT

~J

RT

-R

TOUCH-TONE

calling receiver

3

RV

~J

-R

Digit absorbing

RV

dial pulse RV

~J

call

controller

RV

unit

RV

~J

RV

Digit absorbing

TOUCH-TONE

WV

w

call

controller

unit

9.02

The

station

and

attendant

console

terminate

directly on terminals. Refer to Section

551-722-210 for method of connecting

the

attendant

and

station

equipment.

9.03

Cable

pairs

for

trunks

to

the

central office

-R

also

terminate

directly

on

the

vertical

quick-connect

terminals

as

shown in

Table

D.

These connections

are

made by extending locally

furnished house and feeder cable from

the

trunk

terminal

box to

the

PBX. Knock-outs

at

the

right

or

left

rear

of

the

crown allow

the

cable to

enter

the

PBX crown. The cable mtist be extended to

Page

12

MTG

PLT

NOTES

LOCATION

17

16

Required

for

single digit

nondigit

15

14

absorbing

and

digit absorbing call

control

with

TOUCH-TONE calling.

13

12

One

TOUCH-TONE calling receiver is

required

to

be

mounted

in

position

0

(mtg

plt

7)

when

the

PBX is arranged

7, 8

for

TOUCH-TONE calling. An

additional

TOUCH-TONE calling

receiver is

required

to

be

mounted

in

position

1

(mtg

plt

8) when

the

PBX

is arranged for single

or

3-digit PBX

call control.

17

16

15

Required

for

digit absorbing call

control

14

with

rotary

dial pulsing.

13

12

22-23 Required

for

digit absorbing call

control

with

TOUCH-TONE calling.

the

vertical cross-connection field

at

the

front

of

the

crown. Allow sufficient cable slack to

permit

the field

lo

be raised

or

lowered without binding.

9.04

Secure

the

cable

to

the

terminal

field

framework with plastic clamps furnished in

the loose

parts

bag.

Four

holes

are

provided on

the

front

of

the

terminal

field frame assembly for

bolting

the

clamps to

the

frame. (See Fig. 10.)

9.05

Connect

the

T5

and

R5

leads for

the

remote

answer bell, when required, to

terminals

09

and

19

on quick-connect block

G.

TCI Library https://www.telephonecollectors.info/

.,

ISS 3, S

ECTION

551-720

-

210

r--

29 1

/2

IN.

--j

~·

r-5

1/2

IN I

-~

3 IN. I

t

~

SCRE

W

/2

IN

.-<

IO-

(SEE

NOTE)

t

IN

60

I

6 N.

L

(SEE

NOTE)

FRONT

OR

END PAN

EL

A

SSE

MBLY

OF E

D-I

E0

37

-70

GP-I

CABI

NET Fig. 7-

7618

PBX

Crown

-Location

of

Screw

for

NOTE:

PO

LYURETHA

NE

FOAM TAPE

24

112

IN. X 18

112 IN. X

1/2

IN.

EO·IEOH-

70

, GROUP 1

0.

Fi

g.

6 - lnstallation of Soundproofing

on

Panels

Ground

Fi

g.

8-

7618

PBX

Crown-Vertical

Qu

ick-Connect Terminal Field

Page

13

TCI Library https://www.telephonecollectors.info/

SECTION 551-

720-210

/SHOULDER

,,,..,.,

THUMB

SCREW

Fig.

9-761

B

PBX

vown

-Terminal Fields Raised

Page

14

TCI Library https://www.telephonecollectors.info/

TABLED

TRUNK

CONNECTIONS FROM HOUSE

AND

FEEDER TO PBX

ON

QUICK-CONNECT

BLOCK

G

IF CO

OR

TOLL

OPERATOR

TRUNK

IS

IN

POSITION

CONNECT

HOUSE

AND

FEEDER

LEADS

TO

TERMINALS

00

(T)

0

10

(R)

20 (S)

01

(T)

1 11

(R)

21 (S)

02

(T)

2

12

(R)

22 (S)

03

(T)

3

13

(R)

23

(S)

04

(T)

4

14

(R)

24

(S)

05

(T}

5

15

(R)

25 (S)

06

(T)

6

16

(R)

26 (S)

07

(T)

7

17

(R)

27 (S)

ISS

3,

SECTION

551-720-210

Page

15

TCI Library https://www.telephonecollectors.info/

SECTION

551-720

-

210

Page

16

Pages

Fig

. l

0-Method

of

Mounting

Cable

Clamps

•

. l

I

~

TCI Library https://www.telephonecollectors.info/

AT&T 761B PBX Guide

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