Bell System Practices 636A Manual page 5

NOTE'
LINE SWITCH Off-HOOK SEQUENCE'
de
CLOSES
cb CLOSES
fg
OPENS
( ) CURRENT COLOR CODE
( ( MD COLOR CODE
*
INSULATED AND STORED
I
TERM.ON NET\IORK
� TERM.OH TERM.BOARD 2
[S-W)
(R-G)
[ )
(BR-BK) BR
Ll l
6
[S-R)
(R)
A
AI
TO rIG.
BL
4 OR 5
R OR Rl
B OR 81
:
Fig. 3--Early 636- and 637-Type (MD) Telephone Set, Connections (Amplifier Wired for Polarity Guard Diode
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CD
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BSP 502-610-410-i02_1972-04-05.jpg
Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado Feb 04, 2012 14:14:12
LEGEND'
ON
DIAL orr NORMAL CONTACTS
DP
DIAL PULSE CONTACTS
LS
LINE SWITCH
HS
] (A) 517A JACK A
HS
(B) 517A JACK B
FL
FLASH KEY
UNDESIGNATED
TERMS:ARE ON
HRM.BOARD I
HEAD G3AR
TELEPHONE
HANDSET
SET RCVR
J
RCVR
(W)
I
GN
5
(W-BR )[BK-BL) (BK-BR )[G-Y)
HS
(B) (W)
ON
LS
(BK) (S-BK) (W) (S-R)
f Q R l
(BL-R)
[R-BK)
(w-o)
IBR) [S-G]
c
(0-V)
(Y)
(Y-BK)
(Y-BR)
[G)
(V-BL)
(BL-V) (R)
(W-BL) (G-BL)
6
(S-Y) [Y-BL)
(R)
[Y-11)
(Y-S)
7 (BK)
DIB RINGER
Protection)
425D NET\IORK
c
0
Ll
G
0
L2
��
0
IR-BL) [0]
(w)
G3AR
FL
(BR-R )[G-BK) HANDSET
TRMTR
b
[ )
R-G
(BR-W)
�
(BK)
HEAD
TELEPHONE
(R)
SET TRMTR
HS
(A) (0-BK)
(BL-W)
2 3
LS
(Y) (G OR BL) RR
5
(S-W)
(S)
*
d.
(BL-W) [O-R)
c
AI
FL
(S-R)
IS)
151D AMPLIFIER
B l
(BK-BL)
B
[0-BK)
6 5 4
(Y-G)
HS(a)
6 �
IW-G)[Y-BK]
��;1 4 337
226A
IND
2,
(R) (G-R)
(R-BK)
(G-BK)
[S-BR)
(W-G)
(BL-Y) (0-G)
IBL)
BK
L
3 �
I ( -B )
KS-13490,LI
OP
RESISTOR
(BL) (BK-Gj
4 �
HS
(B)
(BK-S)
4 (S-BK)
-
[ Y (II)
(G) S )
151D
r
AMPLI IER
(S-Y)
(Y-W)
(Y-BL)
( Y-BL)
4
(BK-BL)
v
(G-W)
[
(O-W)
c;;
"'
I
C
(S-BL)
�
"'
m
n
....
5
[S-BR)
z
"'
TPA
5050 2 4
�
0
0