Notes - Bell System Practices Plant Series Reference

LEAD CONN
DESIG BLOCK
DIAL
LIGHT
TRNSF
R (-)
G D
R
...
D
<D
,.
Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 30, 2012 23:28:04
BSP 502-702-100-i01_19 70-03-05.jpg
DIAL LINE
05AK
S W I TCH
MTG LIGHT
CORD (NOTE 2)
G) [s-G]
IG I
IWI
(BK)
IR)
IS)
MIA RINGER
IR)
(5-Rl
16500
(S)
(BK)
Fig. 4-- 1 7028 Telephone Set (Early Production) Using 25H4 Dial and 40108 Network
40108
NETWORK
Ll
I BK) [5-BK]
(8K)
*
INSULA TED AND STORED.
*
( ) CURRENT COLOR CODE
[ J MD COLOR CODE
*
G3AR 25H4
HANDSET DIAL
IRl
IWl
IGl
- G
(R )
RCVR
TRMTR
(BL)
be
de
(0-BK)
ob
fg

NOTES.

I. SET WIRED FOR RING PARTY SERVICE,
SEE T ABLE A FOR CONNECTIONS FOR
OTHER CLASSES OF SERVICE.
2. LINE SWITCH OFF-HOOK SEQUENCE
CLOSES
CLOSES
OPENS
OPENS
�
�
0
0