TABLE 13 FUSE LOCATIONS
ESTB BOARD
STATION PORT NUMBER
F2
F3
F4
- 1
20
21
22
23
- 2
24
25
26
27
- 3
28
29
30
31
- 4
32
33
34
35
- 5
36
37
38
39
- 6
40
41
42
43
- 7
44
45
46
47
- 8
48
49
50
51
- 9
52
53
54
55
- 1 0
56
57
58
59
- 1 1
60
61
62
63
- 1 2
64
65
66
67
- 1 3
68
69
70
71
- 1 4
72
73
74
75
- 1 5
76
77
78
79
2.5.6
SYSTEM
N 6 1 6
N 1236
N 2260
CN3
FIGURE 62
LOCATION OF INTERCOM/EXCHANGE LINE
ACCESS CONNECTORS, FUSE AND LEDS
A single 375mA
3AG fuse is provided on the
board for the RGU power supply.
An intercom/exchange line access connector
is provided on the
board for each
internal extension
for extension one to CN4 for extension four. The link is used as follows:
Link Between
l - 2
Extension has exchange line access
2-3
Extension has intercom access only
Refer to figure 62 for location of the CN connectors on the board. The
board has
to indicate extension status LED1 for extension one, to LED4 for extension 4. The LED lights
when there is a dc loop to the extension i.e. off hook and flickers to indicate decadic dialling.
88
ISSUE 1