Bell System Practices Plant Series Reference page 7

INSIDE
WIRE
TIP
(+l
T O
KEY
EOPT
1-1
RING
AI
DIAL
LIGHT
TRNSF
MODIFICATION FOR 1 A 1 OR 1 A2 KEY
WIRE
OR COLOR
LEAD
( Y)[S-Y]
Line
Switch
Strap
"' Ml W cord or equivalent. Do not use strap if po­
larity guard is to be installed.
( ) Current color code
[ ] MD color code
Scc:mned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 30, 2012 23:28:53
SSP S02-702-100-i01_197 0·03·07.jpg
CONN
BLOCK
IRI
(WI
IYI
NOTE .
I. TO MODIFY 17028 TELEPHONE SET AS SHOWN IN
FIG. 6, REWIRE SET ACCORDING TO TABLE
2. CHECK THAT {BK) (S-BK) STRAP IS TERMINATED
ON (A) OF NETWORK, SETS OF LATER MANUFACTURE
HAVE THIS LEAD INSULATED AND STORED.
3.
LINE SWITCH OFF- HOOK SEQUENCE
be. ab
CLOSES OPENS
de CLOSES fg OPENS
Fig. 6-1 7028 Telephone Set, Wired for 1A1 or 1 A2 Key Telephone System
TABLE C
TELEPHONE SYSTEM
CONNECT TO
REMOVE
FROM
NET. NET.
L2 G
Insulate and stOre
.
Stored
(BK) A
Location
MIA TERM.
RINGER STRIP
(BK}
lSI
(S-RI
(RI
(SRI
C.
TERM
STRIP
Note: Polarity
3
(BK) to on network
U!
(W) to Con network
Remove (BK) dial lead from RR on network and con­
nect to of polarity guard term. strip.
8
ISS 1, SECTION 502-702-100
LINE 4 010-TYPE
SWITCH NETWORK
( NOTE 31
(G I
(S:GJ
(WI [S-W]
a
(S-BR]
(YI [S-Y]
*
INSULATED AND STORED
t
USE MIW CORD OR EQUIVALENT
( CURRENT COLOR CODE
l
[
] MD COLOR CODE
Guard
Lead Connections
(G) toRR on network
(R) to of polarity guard
3
term. strip
Ll
G
Page 7
7 Pages