Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 44

SECTION 503-603-101
TELEPHONE SET
(TOUCH-A-_ T I C)
(6-BUTTON LINE KEY)
149B ADAPTER R2FK
MOUNT I,N_- CORO
_B
I,_,,'I / ss-TYP_ I I_o,_B (Mo) l _
J TYPE lJ J"lCONTROL I,,,..IOR 2012D
I POWERI _ [
I uNIT I INSIDE WIRE DIOR CORD, TRNSF l lit VAC
IW, OR CAE4.E
MOUNT I NG CORD
A25B CABLE
117VAC
TO KEY TELEPHONESYSTEM(SEE NOTE)
NOTE: DISCONNECT THE (V-BL) AND (BL-V) LEADS IN THE CABLE AT KEY SYSTEM END
Fig. l l--0BIock Diagram--2872A1M (MD) or 2872A2M Telephone Set Using 3B (MD) Speakerphone$
Page 44