AT&T Bell System Plant Series Service Manual page 4
Telephone sets
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Also See for Bell System Plant Series:
- Alignment instructions (42 pages) ,
- Reference (36 pages) ,
- Test instructions (26 pages)
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SECTION 502-611-403
TABLE C
PICKUP-SIGNAL KEY CONVERSION (NOTE)
NO. OF PICKUP KEYS
NO. OF PRIVATE
KEY LEADS AND TERMINALS OF KEY UNITS INVOLVED
NO. OF
CONVERTED TO
AND INTERCOM
PICKUP
SIGNAL KEYS
LINES WITH
SUPL KEY ONLY
KEYS
599A OR 5998 OR 598A OR
COM SIG KEYS
(0-W)
(5-W)
(G-R)
(8L-8K)
(8R-8K)
657A
6578
656A
(PER KEY UNIT)
(Y-0)
(0-Y)
6
A-H
A-H
A-H
A-H
A-H
A-H
G
5
1
A-H
A-H
A-H
A-H
A-H
SG*
G
4
1
2
A-H
A-H
A-H
A-H
SG*
SG*
G
3
2
1
3
A-H
A-H
A-H
SG*
SG*
SG*
G
2
3
2
4
A-H
A-H
SG*
SG*
SG*
SG*
G
1
4
3
5
A-H
SG*
SG*
SG*
SG*
SG*
G
6
SG*
SG*
SG*
SG*
SG*
SG*
G
3
1
2
A-H
A-H
A-H
C*
C*
A-H
C*
2
1
3
A-H
A-H
C*
C*
C*
A-H
C*
1
1
4
A-H
C*
C*
C*
C*
A-H
C*
1
5
C*
C*
C*
C*
C*
A-H
C*
*
Terminal on TBVI.
Note:
Table E shows conversion for one 6-button key unit. Convert buttons on right-hand unit first
(module 3 or 5). When more than six buttons are used for common signaling, move spade-tipped
leads of the additional buttons from terminal A-H of unit involved to terminal C. If additional
terminals are required, use X or Y if idle and strap to C.
Page 4
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