ISS 3, SECTION 502-501-101
FROfo4
SH.
I
LINE
SWITCH
(G
I
[ S-G]
(Y)(S-Y)
d e
(W)
9C,7C !MDI
OR
7DIMOI
DIAL
js-w)
425E OR
4258 (MOl
NETWORK
I)
G
I
-
O
R
G3-TYPE
HANDSrT
1
r
•
RCVR
OP
l
TRMTR
g;;:
RR
(BR)
(S·BR)
(s)
(BK)
(w)
NOTES:
I.
FOR MANUAL SERVICE, MOVE (W) [S-WJ LEAD FROM F TO RR TERMINAL.
2. 554A!B,
F
IS
FACTORY WIRED FOR BRIDGED SERV ICE,
556.4./B
IS FACTORY WIRED FOR NEGATIVE RING PARTY, FOR CLASSES
'Of SERVICE NOT SHO� .. REfER TO TABLE
Q,
3.
LINE SWITCH OFF�HOOK SEQUENCE:
(I)
be-MAKES
(3) ob-BREAKS
(2)de-MAKES
(4) gf-BREAKS
4.
STATIONS WITHOUT ANI,
(A)
TUBE LEAD MAY BE CONNECTED TO G IF
RINGER OPERATION IS
MARGINAL. AT
NEGATIVE STATIONS ON 9611
LONG LINE CIRCUITS,
{A)
LEAD SHOULD BE CONNECTED TO G.
l
CURRENT COLOR CO.OE
( )
MO COLOR CODE
OP-DIAL PULSE CONTACT
ON-DIAL OFF-NORMAL CONTACT
TPA 542631
Fig. 7-554A/B, F and 556A/B Telephone Sets, Connedions (Sheet 2 of 2)
SSP 502-501-101-i03_1972-07-13.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:44:39
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