At&t 2833 series Guide

BELL

SYSTEM

PRACTICES

AT

&

TCo

Standard

SECTION

50

3-

702-110

Issue

5, December

1980

TELEPHONE

SETS

833-

AND

2833-

TYPE

IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE

1.

GENERAL

1.

01

This section contains information for the

833-

and 2833-type telephone sets. The

833-

(rotary dial) and

2833-

(TOUCH-TONE®dial) type

key telephone sets are special plug-ended 20-button

key telephone sets, initially designed for use with

the

14A

(MD)

Communication System,

(COM

KEY*

1434).

These sets also may

be

used with

21A

Communication System

(COM

KEY

2152).

For

information on

COM

KEY Systems, refer to the

appropriate section

in

Division

518.

1.

02

This section

is

reissued

to:

• Add information

on

automatic and manual

DO-NOT-DISTURB feature

• Add

D-180990

Kit of

Parts

for 4-wire service

• Add

D-180883

Kit of

Parts

for electromagnetic

interference (EMI)

• Show

14A

Communication System

MD

• Add lead designation for

21A

Communication

System, Fig. 6 through

13.

2. IDENTIFICATION

2.

01

The

833BM,

2833BM,

833CM,

and

2833CM

(Fig.

1)

are modular type telephone sets

and will replace the

833B,

2833B,

833C,

and

2833C

telephone sets, respectively, which

are

hereby

rated

MD.

The

833DM,

2833DM,

833EM, and 2833EM

are al

so

modular sets and are electrically

and

functionally equivalent to

the

833BM,

2833BM,

833CM,

and

2833CM

sets, respectively, except

that

they have been adapted for wall mounting. The

modular sets will all

be

equipped with a G15A-50

*Trademark of

AT&T

Company

handset and H4DU-50 handset cord which

wi

ll

plug

into a

616T

jack mounted on the left front of

the

telephone

set

base (Fig.

2).

Current

production

models of these sets also are equipped with an

improved line switch and an automatic button

restoral (ABR) feature. Some early production

BM

and

CM

sets were not

so

equipped.

Fig

. 1-

2833CM

Telephone

Set

2.02 The

833B

(MD), or

833BM,

833DM

and

2833B

(MD),

or

2833BM,

2833DM

telephone sets

are

equipped with a

647K5

key

in

the lower key position

consisting of a hold button, six line buttons, and

three

intercom buttons. A 647P5C key is located

in

the

upper

key

position consisting of a RECALL

button, a Privacy Release (PRIV RLS) button, and

eight line buttons. The privacy circuit board is

factory installed and wired (Fig.

2).

2.

03

The

833C

(MD) or

833CM,

833EM and

2833C

(MD)

or

2833CM,

2833EM

te

lephone sets

are

NOTICE

Not for use or disclosure outside

the

Bell System except under

writt

en agreeme

nt

Printed

in

U.S.A. Page 1

SECTION

503-702-110

Fig.

2-2833BM

Telephone Set Bose

similar to the above sets except a

647N5C

key is

located

in

the upper key position consisting of a

RECALL button, a RING TRANSFER button (not

connected), and eight line buttons. The RING

TRANSFER button must

be

wired in the field

when ring

transfer

option is provided (Table E).

Note:

In early production

833C

and

2833C

telephone sets the RING TRANSFER key was

factory wired.

2.04

The

DM

and

EM

(wall type) sets and

BM

and

CM

(desk type) sets are not interchangeable

due to the mechanical changes

in

the handset

hanger and the new 6Cl-50 housing.

2.05 An adapter (833A-50) will

be

furnished with

each

DM

and

EM

telephone

set

for wall

mounting. The switchhook of these sets has been

designed to hang vertically to the left of the

housing. The sets are equipped with a hard-wired

mounting cord which can

be

coiled up and concealed

in the adapter or the cord can

be

extended down

the

wall through a notch in

the

adapter

for

termination to appropriate connector-ended cable.

All maintenance can

be

performed on internal

components of these sets without removing the

set

from the wall.

2.06

All of the

833-

and 2833-type sets provide

the same basic services such as pickup, hold

and illumination, and intercom. They are equipped

with a loudspeaker to provide tone and voice

signaling. The level of the tone is adjusted

by

a

volume control knob located under the

right

side

Page

2

of housing. Two or more CO/PBX lines may

be

conferenced

by

simultaneously depressing the buttons

associated with the lines to

be

conferenced. The

three

intercom lines may also be conferenced.

Intercom and CO/PBX lines cannot

be

conferenced

except in the

21A

communication system when the

3rd

IC

path is terminated on a multipurpose button.

Automatic button resotration restores all depressed

buttons to the unoperated positions when the handset

is replaced.

2.07

Multiline conferencing is a feature of these

telephone sets. Since there is

no

amplification

involved, this type conferencing is limited. When

lines

are

conferenced,

using

this

manner

of

conferencing,

distant

stations may have trouble

hearing each other and transmission

is

not guaranteed.

Note:

•when

a telephone

set

is modified

for 4-wire service, multibutton conferencing

between

2-

and

4-wire

systems

is

not

recommended

.•

2.08

The

833-

and 2833-type telephone sets may

be

used with either the 3-type (MD) or

4A

speakerphone system.

•

1\

The

limited

number

of

mounting

cord

conductors places a

restriction

on the

location

of

3-type

(MD)

speakerphone

components unless

it

is desired to give

up

one

pickup

line.

Refer

to

Section

512-620-487

or

512-740-471

for

connection

information

for

the

3-type

(MD)

or

4A

speakerphone

system.

2.09

The

833-

and 2833-type telephone sets are

available in Ivory (-50) only. These sets

will

be

shipped with a disposable faceplate,

so

it

is necessary to order

the

proper

833A

or

2833A

faceplate separately (Table

B).

2.10

Any CO/PBX line may

be

optionally wired

to ring

at

one to four stations (maximum

of two in addition to two

attendant

stations).

Refer to Section

518-450-110

for strapping information.

When common audible ringing is wired

to

a

station

other

than

one

of

the

attendants

station

that

station

cannot

have

the

ring

transfer

option.

The

21A

communication

system

can

have

up

to

three

(3)

attendant

stations

with

optional

wiring.

Ordering Guide

2.11 For telephone

set

and replaceable component

ordering guide, refer to Table

A.

See Table

B for color and faceplate ordering information.

2.12

The following optional

apparatus

may

be

associated with desk type

833

and

2833

sets

(order as required):

•

D-180656

Kit of

Parts

[to provide a wall

shelf mounting arrangement] consists of the

following:

1-840362446 shelf

1-840362479 clamp

1-801812553 screw

Note:

•If

a (wall-type) set is to

be

installed,

a

DM

or

EM

code

set

is available.f

• Diode

533K

or equivalent (order one for

each rotary dial station to

be

restricted)

• 870Al or 2870Al TOUCH-A-MATIC

"'

adjunct,

for connections refer to Section 501-164-201

TABLE

A

ISS

5,

SECTION

503-702-110

•

4A

Speakerphone (order one each of the

following for each station to

be

equipped

with speakerphone). For additional information

on

4A

components, refer to Section

512-700-100.

Loudspeaker,l08AA-tt

(includes 7 foot

D20N

mounting cord)

Transmitter, 680AE-H (includes 7 foot

D8S

mounting cord)

Adapter, 223D-49 (includes 7 foot Ml6H

and

25

foot

M2FG

cord)

Unit, Power, 85Bl-49

• Ringer, ElCM (one for each

CO

/

PBX

line

to

be

wired for power failure

transfer)

•

D-180486

Kit of

Parts

(privacy circuit board),

order one for each station to

be

locked out.

Can

be

added to the

833C,

CM,

EM,

2833C,

CM,

or

EM

telephone set.

t Add color suffix.

*The

transmitter

and loudspeaker

set

will

be

shipped

in

one of five promoted colors,

Black (-03), Ivory (-50), Green (-51), White

(-

58), and Light Beige (-60).

TELEPHONE

SETS

AND

REPLACEABLE

COMPONENTS

ORDERING

GUIDE

FACE

·

HANDSET

TEL

SET

BASE

HOUSING

DIAL

KEY

PLATE'

HANDSET

CORD

LAMP

833

BM

·50

833BM

6 17P5C

647K5

83

2A

-5

0 647N5C

833C

M·50 833

CM

BC

or

647K

5

B

CA

6-

17P5C

833,

\ ·

833

DM

·50

8-

10

99

8678 617K5

6CI·50

6 1

7N5C

833

EM

·5

0 8

4099

8694 6

47K

5

6 17P5C G! 5A

·50

11

4D

U·5

0

fi

lA

2833

61\1

·5

0 2

H3

3BM

6-

17K 3

832

A·50

647N5C

2833CM

-:

i0

283

3CM

6-

17K5

3'>AF:lA

~~3:J

A

·

2

83

3DM

·50 8

40998C86

647P5C

6

47K5

6CI

·5

0 6

17

N5

C

2

833

EM

-50 810998

702

617K5

*

See

Tabll

• B

for

('olor

s

uffi

x.

P~ge

3

SECTION

503-702-110

• Transmitter, 683AE-50 (for

HF

AI feature

of

COM

KEY

2152),

also

includes

a

DO-NOT-DISTURB switch

•

Adapter,

268A (for

mounting

683AE-50

transmitter

when using

DM

or

EM

wall type

telephone sets)

• .Key,

688A

manual DO-NOT-DISTURB option.

This key is intended for use with the 14A

communication system.

It

can also

be

used

with

21A

communication system

at

stations

not equipped with the HFAI option.

• Kit of

Parts,

D-180990

(4-wire interface for

the

14A

and

21A

communication system)

consists of the following:

1-842533440 relay assembly consists

of:

1-Allied

control relay KHX-213

1-842533457 mounting bracket

8-Conductor

assemblies

2-FH

0.086-32

by

5/16-inch

tapping

screw

1-446F

diode

1-801682956 (P-168295), 6-40

by

5/16-inch

BHM

screw

1-801809245 (P-180924),

4-40

by

5/16-inch

BHM

screw.

3. INSTALLATION AND CONNECTIONS

3.01 Install telephone sets

at

desired locations,

making sure

that

any options are installed

before telephone

set

is connected. See Fig. 6

through

13

for schematics of

833B,

833BM,

833DM,

2833B,

2833BM,

2833DM;

833C,

833CM,

833EM,

and

2833C, 2833CM, 2833EM

telephone

sets,

respectively.

3.02 All

DM

and

EM

(wall type) sets are shipped

with an 833A-50 adapter, screw, and clip

(Fig.

3)

which are used for mounting the telephone

set

to a vertical surface. Install the 833A-50

adapter

and telephone

set

as follows.

Page

4

Note:

If

HFAI is to

be

installed, refer to

paragraph 3.05(g) for installation information.

(1)

Mount the adapter to the wall or vertical

surface as shown

in

Fig.

3,

using appropriate

fasteners (Section 080-720-105).

If

the mounting

cord is to

be

dressed down the wall, it is necessary

to pass the cord through the notch

in

the adapter

before final

attachment

of the adapter to the

wall (Fig.

4).

If

the cabling enters through the

wall, the mounting cord may

be

contained within

the adapter.

(2)

Remove faceplate and housing from telephone

set

.

(3)

Hang

the telephone

set

on

the

adapter

from

the headed rivets

that

protrude from the

base pan (Fig.

4).

Note:

It

may

be

necessary to slightly bend

the

top slotted portion of the

adapter

so

the

headed rivets of

the

base pan will align

properly.

(4)

Secure the telephone

set

base with the clip,

and screw

at

the bottom of the adapter

(Fig.

3)

.

(5)

Install telephone

set

options (see paragraph

3.05).

(6)

Replace housing and faceplate.

3.03 A

D-180656

Kit of

Parts

ma

y

be

ordered

separately for shelf mounting of all

B,

BM,

C,

or

CM

sets. The

840362446

shelf should

be

mounted to a wall or vertical surface and,

after

placing the telephone

set

on

the

shelf, secure

set

with retainer clamp and screw furnished with the

shelf. Refer to

paragraph

2.12 for

ordering

information.

3.04

To

install telephone

set

options the faceplate

and housing must

be

removed and the dial

lifted from its mounting brackets. Use a KS-2110711

releaser or equivalent to release the faceplate catch.

Caution:

The

ten

button

key(s)

in

this

set

is

equipped

with

special

low-friction

plastic

parts.

Special

care

is

required

when

removing

or

replacing

these

keys

to

avoid

cracking

or

breaking

the

plastic

hooked

end

683AE

TRANSMITTE

268A

ADAPTER

Fig.

3-833A-50

Adapter

with

268A

Adapter

and

683AE Transmitter

of

the

latchbar

projecting

from

the

end

of

the

key.

When

removing

a

key,

avoid

twisting

or

distorting

the

hook.

When

installing

a

key,

make

sure

the

hook

is

properly

engaged

over

the

edge

of

the

pivot

arm

before

tightening

the

mounting

screws

of

the

key.

Caution:

Unplug

the

set

before

making

wiring

changes

involving

adding

or

moving

spade

tipped

leads

on

the

terminal

board

(e.g.,

privacy

option).

ISS

5,

SECTION

503-702-110

3.05

Options

are

installed as follows:

(a)

Station

Restriction

(833-type

telephone

set):

(1)

Install 533K

or

equivalent diode between

network

terminals

RR

and F. Terminate

negative lead of diode on terminal F (arrow

on diode pointing toward F), with positive

lead on terminal

RR.

(2)

On

telephone

set

terminal board, move

two (G) leads from terminal

22

to 4 and

move two (R) leads from terminal 4 to

22.

(b)

Station

Restriction

(2833-type

telephone

set):

On

telephone

set

terminal board,

move two (G) leads from terminal

22

to 4 and

move two (R) leads from terminal 4 to

22.

(c)

Privacy

Circuit

833C,

833CM,

833EM,

or

2833C,

2833CM,

2833EM

(D-180486

Kit

of

Parts):

(1)

Mount privacy circuit board on the two

standoffs located

at

the left

front

of the

telephone set base (Fig.

2)

using mounting

screws furnished with the telephone set.

(2)

Refer to Table C for connections.

(3)

To

test

privacy circuit refer to

3.06.

(d)

Disable

Privacy

Circuit

(D-180486

Kit

of

Parts)

833-type

telephone

sets:

Remove

(0)

and

(BK)

leads of privacy

circuit from the telephone

set

terminal 8 and

12,

respectively, and insulate and store.

(e)

To

Disable

PRIV

RLS

(part

of

top

key)

833B,

833BM,

833DM

or

2833B,

2833BM,

2833DM

telephone

sets:

Move

(0-BK)

lead of privacy release key from telephone

set

terminal

10

to

15,

see Table

G.

Page

5

SECTION

503-702-110

Fig.

4-Mounting

Telephone Set Base onto

833A-50

Adapter

(f)

RING

TRANSFER

(833C,

833CM,

833EM

or

2833C,

2833CM,

2833EM

telephone

set

only):

(1)

Refer to Table E for connections.

(2)

Refer to Section 518-450-102 for KSU

strap

addition.

Note:

Early version of the

833C

and

2833C

telephone sets had the RING TRANSFER

feature factory wired. Current

833C,

833CM,

833EM and

2833C,

2833CM,

2833EM telephone

sets are not factory wired for RING TRANSFER.

(g)

HANDS-FREE

ANSWER

INTERCOM

(HFAI):

(1)

If

feature is to

be

added to

DM-

or

EM-type set, a

268A

adapter

must

be

used as follows:

Page

6

(a) Mount

268A

adapter onto

833A-50

adapter

with two screws as shown

in

Fig. 3

with the tabs of

the

268A

adapter facing

outward from the vertical surface. The

683AE-50

transmitter

is

secured

by

sliding

the

transmitter

downward between the tabs

on

the adapter. The telephone

set

end of

the

transmitter

cord enters the telephone

set

and is attached to the telephone

set

base

at

the small notch on

the

top edge of the

base panel. The excess cord is stored

in

the 833A-50 adapter.

(2)

For B/BM or C/CM (desk type) sets, the

transmitter

cord will

enter

at

the

rear

of

the set.

(3)

Refer to Table D for connections.

Note:

It

may

be

necessary to slightly reduce

the volume

at

the telephone

set

if distortion

or feedback is noticed when the HFAI feature

is used.

(4)

•Included as

part

of the 683AE

transmitter

(furnished with the

HF

AI

feature)

is

a

manual DO-NOT-DISTURB switch. Depression

of the switch (Fig.

3)

prevents voice signaling,

alerting tone, and activation of the microphone.

A distinctive tone

is

sent

to any station

that

is calling

another

station

on

dial

intercom

when the called station does not

want

to be

disturbed. The only signal

that

can be received

by

a station or answering position with

the

DO-NOT-DISTURB switch activated

are

tone

ringing and the

alerting

tone and one way

voice signaling associated with an

automatic

signaling

intercom.

(h)

Automatic

and

Manual

DO-NOT-

DISTURB

(DND)

Feature,

COM

KEY

1434

and

2152

(1) This feature permits a

station

user to

block any incoming dial intercom and DSS

calls. Use of this feature

alerts

the calling

party

that

the called

party

does not

want

to

be disturbed. This is accomplished by

returning

an audible tone

(500

Hz, continuous) to the

calling

party

whenever

either

the

automatic

or

manual DND feature is activated. In

COM

KEY

2152

system, a visual signal is also

provided on the DSS console when

the

manual

DND feature

is

in use. The

COM

KEY

2152

system currently provides a manual DND

option

but

it is only available

on

station

sets

that

are

equipped with the

HFAI

option. The

major difference between the automatic and

manual DND options

is

that

automatic is

activated only when the station

set

is

off-hook,

while the manual can

be

activated with the

station on-hook

or

off-hook.

(2)

Refer

to (Fig. 14)

for

telephone

set

modificaton for automatic DND feature.

(3) Refer to Section 518-450-102 for necessary

KTU

and KSU connection information with

the DND feature.

(4)

For

manual

DND

feature

with

these

telephone sets, a

688A

key

must

be

ordered

separately and installed

as

follows:

(a) Attach the key

on

the

right

side of

the telephone

set

baseplate and under

the

set

housing.

(b) Modify the telephone

set

wmng

and

terminate

the spade-tipped key leads

I

SS

5, SECTION

503

-702-110

as shown in the appropriate modification

table (Fig.

15).

(c) Refer to Section 518-450-102 for necessary

KTU and KSU connection information

with the DND feature.

(i)

Four-Wire

Service

(D-180990

Kit

of

Parts,

Ordered

Separately).

(1) Mount the relay assembly in the

front

right-hand corner of the telephone

set

using mounting bracket and screws as shown

in Fig.

5.

(2) Connect the relay spade-tipped leads as

shown in Table I and Fig.

16.

(3) Refer to Section 518-450-102 for

14A

(MD)

communication system and Section

518-450-110

for

21A

communication system interconnecting

wiring arrangement.

(j)

Electromagnetic

Interference

(EMI)

Mitigation,

D-180883

Kit

of

Parts

(ordered

separately).

(1)

An

amplifier printed wiring board assembly,

equipped with RFI suppression

is

available

and is a direct replacement for the amplifier

board furnished with these telephone sets

.•

3.06

Privacy

Circuit/Privacy

Release

Test:

(a) Busy out a line using

another

station (Station

X)

.

At

the

set

with the privacy circuit to

be

tested (Station

Y)

go off-hook

on

that

line.

Station

Y should

be

locked out.

Hang

up Station

Y.

(b)

If

Station X has a privacy release key,

depress it. The lamp under the busy line

will indicate it is on-hold. Station Y should now

be able to pickup the line on hold. Release the

privacy release button, Station X and Y should

now

be

bridged.

Hang

up

Station

Y.

(c)

If

Station X does not have a privacy release

key

but

does have a privacy circuit he cannot

allow Station Y to bridge onto

the

call without

excluding himself.

(d) With the line still busied

out

by

Station X

and Station Y not bridged, depress a different

P

age

7

SECTION

503-702-110

842533440

RELAY

ASSEI'IBLY

0.086-32 X 5/16-

IN.

FH

TAPPING

SCREW

(2)

~

"''

"'''''

,,

_,,,,,,,

4-

40

X5/16

IN

.

BHM

SCREW

Fig

. 5-

.Mount

i

ng

Location for 4-Wire Relay

Assembly.

line on Station Y and

go

off-hook. While

ho

lding

that

line button depressed bridge onto the line

that

was busied out

by

Stat

i

on

X.

Station Y

should

be

locked out of both lines.

3.

07

When

insta

ll

ing faceplate, insure th

at

the

co

ll

ar

is

in

place

on

the key. Place the

tabs

into slots in fr

ont

of the faceplate ope

ni

ng

in

the

housing and l

owe

r sl

ow

ly over the

di

al and key

co

ll

ar

un

til almost in place. Use a

KS

-

21107L1

releaser or equivalent to release the faceplate catch

and

seat

the faceplate.

3.

08

The

647

K5 and 647P5C keys use designation

ta

b

s,

forms E

-583

7 and

E-66

72 (n

ew

preprinted

Page

8

designation tabs for feature designations). The

forms are shipped with the telephone sets.

To

install, squeeze sides of the cap and remove.

Insert

designation tabs and replace cap with locking tabs

along the horizontal axis of the key.

3.09

For telephone set number designation, use

form E-10360, E

-1

0364-§,

or E-10368-§ for

rotary dial sets and form E-10361, E-10365-§, or

E-10369-§ for TOUCH-TONE dial sets.

3.

10

Refer to Fig. 6 through

13

for telephone

set

sc

hematics.

§ Requires th

at

area

co

de

be

added.

3.11 Refer to Section 512-620-487 or 512-740-471

for connections to 3-type (MD)

or

4A

speakerphone system, respectively.

3.12

If

Power Failure Transfer feature is to

be

provided, use an external ringer (E1CM)

and connect as shown

in

Table

H.

4. MAINTENANCE

4.01

Maintenance

of

the

833-

and

2833-type

telephone sets should

be

limited to checking

for loose or broken connections and replacement

ISS

5,

SECTION

503-702-110

of items listed under Ordering Guide table as

replaceable components.

Telephone

set

should

not

be

carried

by

the

switchhook

since

this

applies

excessive

strain

to

the

line

switch

and

could

cause

a

trouble

condition.

4.02 The

current

production 647-type key has

been modified for easy lamp replacement

by

merely removing the lamp cap and inserting a

553-type tool through the hole in the top of the

button. In early production keys,

it

was necessary

to remove faceplate, key collar, and button for

lamp replacement.

Page

9

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AT&T 2833 Series Guide

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