Bell 502-501-120 Service Manual

BELLSYSTEMPRACTICES SECTION 502-501-120
AT&TCo Standard Issue 8, August 1978

REFERENCE

503B, 503C, 503CM, AND 513B TELEPHONE SETS

1. GENERAL 2.04 Fig. 3 and 4 provide connection information
on the 503C and 503CM telephone sets. The

1.01 This section provides identification and 503CM is a modular set which is shipped with a

connection information for the 503B (MD), G15A handset but without H4DU handset cord and

503C (MD), 503CM, and 513B (MD) telephone sets. the D8AA mounting cord, which must be ordered

separately.

1.02 This section is reissued to:

2.05 The mounting cord of the 513B telephone

• Revise Fig. 4 set plugs directly into the JID401F data
set. Operation of the exclusion key (left plunger)

2. IDENTIFICATION transfers the set from the voice mode to the data

mode. It is also equipped with a test key which

2.01 These telephone sets are desk sets intended converts the set to the test mode and test lamp

for use in conjunction with other equipment which illuminates when the test mode is operating.

to provide DATA-PHONE * data communications Fig. 5 provides connection information on the 513B
service, telephone set.

2.02 With the exclusion key operated (up position), 2.06 For application of these telephone sets, refer
the 503B telephone set can be used with to Division 590.

the J1D402B data set to provide data service.
With the exclusion key nonoperated (normal position)
the set provides regular telephone service. Fig. 2

provides connection information on the 503B telephone .......

set. DATA KEY & ............... ........_ : _ :I;_ _ II

2.03 The 503C and 503CM telephone set is used {5_3BONLY)

TE ST L AM P Z_c:-':::"'"_" _,

in Data Access Arrangements (DAA) where _i

cutomer-owned equipment is connected to the DDD _
network through a coupler. With the exclusion

key nonoperated (normal position) the 503CM
telephone set may be used with the J1D402B data /

set to provide data service with monitoring of TESTKEY SPADE-TIPPED

computer-generated voice replies. With the exclusion (5_3BONLY) MOUNTINGCORD

ON 505B

key operated (up position), the set provides regular
telephone service. To deactivate monitoring feature,

see Fig. 4. The 503C telephone set may be used Fig. 1--503B (MD), 503C (MD), or 513B (MD)
with the JID402B data set with the exclusion key Telephone Set
operated (up position). With the exclusion key
nonoperated (normal position) the set provides
regular telephone service.

Note: The relationship of features to
exclusion key differs in the 503C and 503CM
telephone sets.

Not for use or disclosure outside the

Bell System except under written agreement

Printed in U.S.A. Page 1

NOTICE

SECTION 502-501-120

TABLE A

REPLACEABLE COMPONENTS (NOTE)

TEL HOUSI NG MTG HANDSET MTG CORD

SET ASSY CORD CORD SET JACK

......

503B-61 818049611

(MD) G3A6-61 or C4A (P-80D961) or

503C-61 818049611

(MD) G3A6-61 or (P-80D961) or 52A

503CM-61 G15A-61 9CA-61 841023823 D8AA-87 H4DU-61 641D 616D

513B-61 9C-61 818815615 H4CJ

(MD) G3A6-61 or C4A (P-88A561) D10H-87 or

Note. These sets are available in light gray (--61) only.

HANDSET DIAL RINGER LAMP CORD SET

9C-61 H4CJ

9CA-61 H4CL

9C-61 H4CJ

9CA-61 H1B H4CL

9CA-61 H4CL

TO PROVIDE DATA SET CONTROL WITH

EXCLUSION KEY OPERATED (503CM ONLY)

D6AA-87

0TABLE B (I

HANDSET

JACK

Page 2

LEAD COLOR

R L2 E2

Exclusion
Key BR 1 GN

641D Jack O-W 8 7

S E2 L2

0 GN 1

REMOVE FROM CONNECT TO

TERM. BOARD NET. TERM. BOARD NET.