Bell 502-521-410 Service Manual

BELLSYSTEM PRACTICES SECTION 502o521-410
AT&TCo Standard Issue 5, November 1980

SERVICE

554A/B, 554F, 554AM, 554BM, 554AMP, AND 554BMP

TELEPHONE SETS

CONNECTIONS

1. GENERAL 1.03 Refer to Table A for line and ringer

1.01 This section contains information for the

554A/B (MD) (Fig. 1), 554F (MD) (Fig. 1),

554AM (MD) (Fig. 2), 554BM (MD) (Fig. 3), 554AMP 1.04 Refer to Fig. 6 for set modifications when
(MD) (Fig. 4), and 554BMP (Fig. 5)telephone sets. used with a key telephone system.

1.02 Reissued to:

• Show 554A/B, 554F, 554AM, 554BM, and to the appropriate table in Section 501-375-101

554AMP telephone sets rated MD for connection information. If a 603A ringing

• Add information on modifying 554BMP set for connection information. Whenever four party
for A Lead control full selective or eight party semiselective ringing

• Revise Table A. Kit of Parts information.

connections.

1.05, If a 28A ringer isolator is required, refer

extender is required, refer to Section 501-380-102

is required, refer to Section 501-320-100 for D-180697

NOTICE

Not for use or disclosure outside the

Bell System except under written agreement

Printed in U.S.A. Page 1

SECTION 502-521-410

$ TABLE A (I

554A/B, 554F, 554AM, 554BM, 554AMP, AND 554BMP

TELEPHONE SET LINE AND RINGER CONNECTIONS

TERMINAL

WIRE TIP TIPPARTY IDENT GROUND

OR COLOR OR RING NO NORMAL

LEAD BRIDGED IDENT CONNECTIONS

,

INDIV PARTY CONN

PARTY TO L.L. EQUIP

GRD

1000_., 2650_ 1000_'-_ 2650_?,

(NOTE 2)

Inside

Wire

or Ring R L2 L2 L1 L1 L1 L1 L1

523A Tip G L1 L1 L2 L2 L2 L2 L2

Plug Grd Y G G G G G G G
Lead Spare BK * * * * * * *

in

Set

Line Switch S L2 L2 L2 A A A A

Ringer R L2 L2 L2 K B B G

Leads BK L1 G G G B B K

(Notes 1 S K K K B K G B

And 3 S-R A A A B G K B

Note 1. To silence ringer for all classes of service, refer to appropriate section in Division 501.
Note 2. If bell taps on stations connected to long line equipment, use these connections to retain tip party ground

identification.

Note 3. When grounded ringer arrangments are used on 96 volt long line circuits, a D-180036 ringer isolator must be used.

• Insulate and store

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ISS 5, SECTION 502-521-410

C4A GI-(MD) OR 7-(MD) OR

WIRE (NOTE I) HANDSET NETWORK ;_Ji LINE SWITCH DI_L

TIP (G) " I !_ NOTES:

(BK'----_) "W _(S)_(R)) _ _) (_RR _)) (BL)(GOR BL) )71- DP 2. MOVE(W) ms-w]LEADFROMMANuALFTOsERVIcE.RRFOR
RING (R)

_ (eK)

' ,d I. WIRED FOR BRIDGED

..........ii

• (S-R) • _)A 'e TABLE A FOR ALL OTHER

i) "¢JK T _ )':..:i')_il CLASSES OF SERVICE.

:l _ ( ) CURRENT COLOR CODE

:'_"-" W S-W RINGING. REFER TO

_.o,Y, ,_.. eo ec N (..)l_--I :_)iiii))

_j (R) IS'R] -_f ON

Fig. 1--1F554A/B (MD) and 554F (MD) Telephone Sets, Connections(I

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