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Bell System Practices AT&T Plant Series Identification, Installation, Connections, And Maintenance page 9

Telephone set components for installation in customer-owned housings

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1SS 2,
SECTION
501-410-101
[
T
I
( w-s)
F
CONTROL
UNIT
TO KEY
w
0
2
i5A
(MD)
554
*
EQUIP
R
LI
55B
(s-w)
28
28
10
0
ra
RI
4
[ BR-WI
v
w
I
19
19
I
m
TI
5
(W-BR)
RR
0
n
w
5
5
II
0
n
n
AG
6
(w-o)
w
1
A
7
(W-G)
TO KEY
21
4
EQUIF?
-
L
n
P3
8
(W-EL)
w
w
w
w
30
13
0
0
a
P4
9
( BL-W)
BB
12
12
2
TO KEY
Al
0
n
n
EQUIP
Al
10
(G-W)
L2
.
P
LK
3
(o-w)
36
36
36
'---+%-J
t
TFI
0
n
n
0
n
0
' J
To
2012B
27
27
27
TF2
TRNSF
\
( NOTES
I ANO 2)
LEAO
44A
MTG CORD
TRMTR
OESIG
CONN
BLOCK
TI14
T 7A
666A
666B
(NOTE 4)
LK
3
(BK)
(BK-0)
II
8
w
w
4
4
7
I
I
0
cl
Ml
n
( BR-BL)
(S-BK)
2
w
w
w
0
14
14
16
0
M2
2
0
0.
(w)
[BK-S)
5
3
w
13
13
8
0
n
PI
4
( BL)
(BL-R)
4
2
w
w
w
2
2
17
0
FI
5
(Y)
(G-Y)
10
7
c.
w
u
u
3
3
IB
O
s
7
(R)
(O-SK)
e
5
0
w
u
w
29
29
19
0
m
c.
Al
8
(G)
(Y-o)
9
6
w
w
u
w
24
24
30
R2FK
P
MTG CORO
760A
34
34
LS PK
0
n
n
(
NOTE 3 )
!1
SPI
n
9
n
(G)
0
33
33
2s
0
c.
n
(
NOTE 3)
*
SP2
10
(R)
w
u
0
NOTES:
I
OUE TO L(MER
~TAGE
RATING
201iA
TRNSF
SHOULO
NOT BE
USE,
TO POWER
55-TYPE
CONTROL
UNIT,
2.
00
NOT
USE ANY GROUNOEOPOWER
SUPPLY,
SUCH AS THE
18V AC
TAP ON THE
101-7ypE
POWER SUPPLY,
TO POWER 55-TYPE
CONTROL
UNIT.
USE OF GROUNDEO
POWER SUPPLY
WILL
AFFSCT
OPE RATION
OF UNIT.
3. I F
REOUCED
LOUDSPEAKER
VOLUME
IS OESIRED,
CONNECT
SE?. LEAO
TO TERMINAL
24(55A)
OR 3JX55B)
4.
INSULATE
ANO
STORE
UNUSED
LEADS
OF
TI I A CORO.
*
55A
CONTROL
UNIT MOOI FIEO
BY WESTERN
ELECTRIC
COMPANY.
t
D- 1614138 CONNECTOR.
Fig. 6—F-56659
and
F-56660
Telephone
Set, Speakerphone
Connections
Page 9

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At&t f-56659At&t f-56660