Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 34

SECTION 503-603-101
FIG. D
DIAL TONE DETECTOR
(P/O D- 180.493)
INPUT (G- R )
PB (O-BK)
FIG. C
RELAY PRINTED
WIRING BOARD
(D- 80492 )
INPUT (G-R)
FIG. DT (O-Y)
PFR (BL-V) _o7 I B
VDD ( W-G ) __,_4 ! VDD (R-O)
DR (Y-O)
PL (O-R)
FIG. E
DTT (BE-Y)
ONE-TOUCH SPR (Y-BE)
CALLING SWITC H
(P/O D-180493)
lS_ (s) , ol
FIG" _S B 2 (S} COM (BK-O)
I
SPO (G-Y)
Fig. 9--2872AIM (MD) or 2872A2M Telephone Set, Connections (Sheet 2 of 5)
Page 34