Modification For 1A1 Or 1A2 Key Telephone System - Bell System Practices Plant Series Reference

SECTION 502-702-1 00
LEAD
DESIG
RING
TIP
TO
LINE
GRD
TO
DIAL
LIGHT
TRNSF
Fig. 5-17028 Telephone Set, Wired for 2650 Ohm Tip Party ldenti
WIRE OR LEAD
Dial
Line
Switch
D5AK Cord
*
D-180229
Polarity
Guard
�
Component of polarity guard assembly
If wired for ring or bridged service
If wired for tip party (no identification ground)
If wired for tip party (with identification ground)
Page 6
SSP S02-702-100-i01_1970-03-06.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 30,2012 23:28:26
CONN 05AK
BLOCK MTG
CORD
(G)
IRI
(Y)
(WI
(BKI
NOTES:
I. TO MODIFY 17028 TELEPHONE SET AS SHOWN IN
FIG. 5,REWIRE SET ACCORDING TO TABLE A.
2.
FOR tOOOll TIP PARTY IDENTIFYING GROUND
CONNECT (S) INSTEAD OF (5-R) TO Ll.
POLARITY GUARD CONNECTIONS FOR NONKEY TELEPHONE SYSTEMS
(D-180229 KIT OF PARTS)
COlOR
B K
(BR) [S-BR]
(G)
(R)
(BK)
( G)
(W)
TERM.
MIA
RINGER STRIP
(R)
(S-RI
16501)
lSI
10001)
IBKI
*INSULATE OR STORE ON UNUSED TERMINAL.
I
I CURRENT COLOR COOE.
[] MO COLOR CODE.
TABLE 8
REMOVE FROM
NETWORK
R R
c
[ ] MD
( ) Current color code
color code
Note: Install polarity guard assembly only when specified
by local instructions for end-to-end signaling.
LINE
4 010-TYPE
SWITCH
NETWORK
IBKI [S·BK]
IBR) IS-BRl
IYI IS-Yl
lSI
2)
(NOTE
CHI
d IGI
rs-wl
(WI
!
ication Ground
CONNECT TO
NETWORK TERM BOARD•
3
4
4
RR
c
K
Ll
G