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Appendix A. NT1 Type 400 Circuit Pack
1
When pin 25 is pulled to ground,
the NT1 Type 400 is signaled that
its battery backup is in use.
Figure A-1. NT1 T400 Circuit Pack Connector Pin Assignments
A-2
S/T Transmit
(Customers 1 & 2
in parallel)
U Transmit/Receive
1
Backup Power
S/T Power
S/T Transmit
(Customers 1 & 2
in parallel
NT1 T400 User Manual
DT
DR
TR
TT
-48V
Frame GND
E
M
GND
R1
Frame
GND
T1
55
56
53
54
51
52
49
50
47
48
45
46
43
44
41
42
39
40
37
38
35
36
33
34
31
32
29
30
27
28
25
26
23
24
21
22
19
20
17
18
15
16
13
14
11
12
9
10
7
8
5
6
3
4
1
2
61212016L1-20
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