Bell System Practices Plant Series Identification, Installation, Operation, Connections, And Maintenance page 8

SECTION 529-226-113
1ST POSITION
:
CONTROL KEY
( N ONLOCKINGl
LAMP
1ST
2ND POSITION
CONTROL KEY
(NONLOCKING)
I
2ND LAMP
3RD POSITION
PICKUP OR
SIGNAL KEY
I
(LOCKING)
3RD LAMP
4TH POSITION
PICKUP OR
SIGNAL KEY
(LOCKING)
4TH LAMP
POSITION
5TH
LINE I
PICKUP KEY
I
( L OCKING)
5TH LAMP
HOLD K E Y
LAMP
6TH
I
CHAINING
I
SWITCH
Fig. 5-Mounting Cord and Key Units For 2626A 1 Telephone Set (Sheet 1 of 6)
Page 8
1ST MODULE KEY UNIT
(599AKEY)
CONN
26
2
27
13
38
3
28
4
29
14
39
5
30
6
31
1
5
40
7
32
8
33
16
4
1
TO
9
34 SH
2
10
5
3
17
42
I I
36
--+<
1
--+<
2
37
8
1
43
50
49
48
23
24
25
22
47
19
44
20
45
21
46