1. GENE RAL 104 If 28A ringer isolator is used for ringing range extension or ringer isolation refer to Section 1.01 This

(1)

SERVICE

2500D, 2500DM,

AND 2500DMG

TELEPHONE SETS

CONNECTIONS

1.

GENERAL

1.04

If 28A ringer

isolator

is used for ringing

range

extension

or ringer

isolation,

refer

to Section

1.01

This

section

contains

information

on

the

501-375-101.

2500D

(MD),

2500DM,

and

2500DMG

tele-phone

sets (Fig. 1, 2, 3, or 4 and Table

A).

1.05

For 4-party

full selective

or 8-party

semiselec-1.02

This section

is being

reissued

to add informa-

tive

ringing

using

the

425A

electron

tube,

tion on 2500DMG

telephone

set equipped

with

refer

to Section

501-320-100.

72-type

dial Fig. 4. Revision

arrows

are used to

em-phasize

the more

significant

changes.

1.06

If the 603A ringing

extender

is required,

refer

1.03

SEarly

version

2500DMG

telephone

sets

are

to Section

501-380-102.

equipped

with

a 35-type

dial plus

a separate

polarity

guard,

later version

2500DMG

telephone

sets

will be equipped

with

a 72-type

dial

which

has

a

1.07

When end-to-end

signaling

is provided,

install

built-in

polarity

guard.

Refer to Table C for modifica-

a 2500DMG

set or add the

D-180896

Kit

of

tions when replacing

35-type dial with a 72-type

dial.

Parts

(polarity

guard)

to a 2500D or 2500DM

set.

Refer

to Section

502-503-101 for additional

informa-

Refer

to Table B for polarity

guard

connection

infor-tion on 72-type

dial when

used with

2500-type

tele-

mation

and

Section

502-503-101

for installation

(2)

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NOTES:

I. SET FACTORY WIRED FOR INDIVIDUAL OR BRIDGED RINGING.

SEE TABLE A FOR ALL CLASSES OF SERVICE.

2. MUST BE ORDERED SEPARATELY

(4)

INSIDE

625A

D4BU

623D3

RINGER

4228-TYPE

LINE

POLARITY

DIAL

WIRE

CONN BLK

MTG

JACK

(NOTE I)

NETWORK

SWITCH

GUARD

CORD

LI

T

TIP

(G)

_

,) >

(G)

(G) dxe

(W)

F

(BK)

<

),

= (S-R)

_

(G)

=

K

RR

= (S)

_)

(_

(BK)

=

GRD

(Y)

<

_) >

(Y)

(_

....

(O-BK)

.

(w)

_

RING

(R)

_

<_

_> _. (R)

/

(Y) b vc(BR)

S

= (R)

__

._(__a

G15A

H4DU

616D JACK

HANDSET

CORD

( R-G )

=

(NOTE 2)

(W)

/

<

>

(W)

R

(W-BL )

=

B

(BK) _

(_

>

,-" (BK)

_)

(eL)

,

T

(R)

/

\

<

>

\

/

(R)

_

(R)

;N

_,

(W)

.

NOTES:

I. SET FACTORY WIRED FOR

INDIVIDUAL OR BRIDGED RINGING.

SEE TABLE A FOR ALL CLASSES OF SERVICE.

2. MUST BE ORDERED SEPARATELY

(5)

INSIDE

625A

D4BU

623D3

RINGER

4228-TYPE

LINE

DIAL

WIRE

CONN BLK

MTG

JACK

(NOTE I)

NETWORK

SWITCH

CORO

. <

> >

,(G)

:

(BK)

_(BK)/<.

>

:

(S R)

_

I

(G)

.

K

RR

=(s)

Q

(D

(BK_.

Y

G

C

GRD

(Y)

_(Y)

<

....>

>

(Y)

_

._._

(_I _(.I< <

> > (.I

'___

°

=

(R)

/

L_

"t-(S)Ia

G15A

H4DU

616D JACK

HANDSET

CORD

(_(w).,

<

> > (w)

R

"I

I

g

(G).,

<

> > (G)

_(R)

<

>

(R)

(BL)__.

T

(_(BK)

< <,

> >

(BK)

.

_

(R)

,

GN

(2)---

----__-NOTES:

I. SET FACTORY WIRED FOR INDIVIDUAL OR BRIDGED RINGING.

SEE TABLE A FOR ALL CLASSES OF SERVICE.

2. MUST BE ORDERED SEPARATELY

(6)

BTABLE A _1

LINE AND

RINGER CONNECTIONS

FOR 2500D

(MD)

2500DM,

OR 2500DMG

TELEPHONE SET

TIP PARTY

INDIV

ID GROUND

OR

RING

NO ID

WIREOR LEAD

BRIDGED PARTY

GROUND

1000_

2650_

R

Line Wire at

G

Conn Block

Y

BK

B

R

Mtg Cord at

Conn Block

G

13

(2500D)

Y

G

Y

R

L2

I Jl

L1

Mtg Cord

in Set

G

L1

L2

(2500D)

Y

G

Jack Conductors

R

L2

L1

in Modular

Set,

G

L1

L2

2500DM

or 2500DMG only

Y

G

S

L2

A

Line Switch

Leads

Wt

F

C

BRt

C

F

R

L2

L1

K

B

Ringer Leads*

BK

_

G

B

S

K

B

K

S-R

A

B

G

* To silence ringer permanently

for all classes of service, refer to the

appropri-ate ringer

section

in Division 501.

t This change for tip party does not apply to sets equipped

with a 35-type dial

and polarity

guard or 72-type dial (2500DMG telephone

sets).

(7)

STABLE

B!

POLARITY

GUARD

CONNECTIONS

(SEE NOTE)

_ _ _ . ,,, ,, ,

REMOVE FROM

CONNECT TO

POLARITY

WIRE OR

COLOR

GUARD

LEAD

NET.

POLARITY

GUARD

... , ...

W

F

T

Line

Switch

...

D-180896

BR

C

S

Kit of Parts

•

_

G

F

Guard

Assembly

W

C

...

W

F

T

Line Switch

819040528

BR

C

S

(P-90D052)

(MD)

...

Polarity

G

F

Guard

...

W

C

... _., ...

Note"

For use with a 35-type dial when

specified

by local instructions

for end-to-end

signaling

installations.

STABLE C4

MODIFICATION

TO REPLACE 35-TYPE

DIAL WITH

72-TYPE

DIAL, IN

2500-TYPE

TELEPHONE SETS

REMOVEFROM NET.TERM.

CONNECTTO NET. TERM.

OR TERM.STRIP

WIREOR LEAD

COLOR

(35-TYPEDIAL)

(72-TYPEDIAL)

W

GN

W-BL

S

O-BK

C

Dial

BK

RR

R

T

BL

B

R-G

R

G

F

BR

C or St

D_

Line Switch