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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
10
DT
S/T Transmit
(Customers 1 & 2
in parallel)
DR
TR
U Transmit/Receive
TT
-48V
Frame GND
1
Backup Power
E
S/T Power
M
GND
R1
S/T Transmit
Frame
(Customers 1 & 2
GND
in parallel
T1
NT1 T400 User Manual
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
61212016L1-1
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