Instruction manual

Installation
60 025-9416
25-pair cable
(Part No.
709-0004)
To Model 640
RJ21 interface
(See Figure 5-6)
To telco
interface
R
J
2
1
R
J
2
1
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
11
37
12
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
50
T1
R1
T2
R2
E
M
T1
R1
T2
R2
E
M
T1
R1
T2
R2
E
M
T1
R1
T2
R2
E
M
G
radio station
wiring
TRUNK A
TRUNK B
TRUNK C
TRUNK D
Model 640 Interface Punchdown Block
standard 26
gauge
telephone wire
RJ66M425 Telco Block
J1P1
J1P2
J1P3
J1P4
J2P1
J2P2
J2P3
J2P4
J3P1
J3P2
J3P3
J3P4
J4P1
J4P2
J4P3
J4P4
J5P1
J5P2
J5P3
J5P4
J6P1
J6P2
J6P3
T R T R
T R T R
J6
J5
J4
J3
J2
J1
Figure 24. Telco Wiring With Optional RJ66M425 Block
Pin # 6-Wire Lead 8-Wire Lead
1 E (ear) signal TIP 2
2 TIP 2 RING 2
3 RING 1 TIP 3
4 TIP 1 RING 1
5 RING 2 TIP 1
6 M (mouth) signal RING 3
7 TIP 4
8 RING 4
8-wire miniature
keyed jacks
1
6
1 8
1 4
Figure 25. Wiring Comparison for RJ-Type Phone Jacks