Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 46

SECTION 503-603-101
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I I PSB I LI; )1 @ t(BL-R)
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d 13
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(G);
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i _ I I
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I I I DIAL COM SW I STRAP'
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34
(V-BR)
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I I 3 8 @ LEGEND"
, y __ ___B_I _._. _ ----__ @WITHOUT 4-WIRE OPTION
I I TB2 @ WITH +-WIRE OPTION
t (R) -" 1 I \ I t (R) 12 (BR-Y) ! I (G-BK)
_-...-, I ','> "_ - _)" "W INSULATE AND STORE
TRM_TRI ! il '
!
R
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1 (BK) 1> >1 (BK) (_8 (Y-BL) (_)
[ +
TB2
4- WIRE CONTROL
NET. NET.
MTG. CORD TBI.^ l YJ//_ L_
3
2 { AI(O-w) _ (Y) T ..C (BR)
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- X e i
b I 2 I
(Y-BL)
27 {IA (W-O) I I v/V_ 2 (W) _) TBI
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T X -2 (BK) (BK)
TO OTHER i ) "I'_I
"A" LEADS v 2 (y)
PU
Fig. 13--2872AIM (MD) or 2872A2M Telephone Set--2/4-Wire Connections
Page 46