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Appendix A - Specifications
H4TU-C-231 L
Figure 32
shows the card-edge connectors on the H4TU-C-231 List 1. Active pins are highlighted in black.
Network Management Control Bus
The H4TU-C provides a Network Management Control Bus on pin 46 of the card-edge connector. This allows the
various ADC Management System protocols to manage the H4TU-C through the HMU-319 management unit.
Whenever the H4TU-C is under management, the MNGD message displays periodically on the front-panel display.
Some H4TU-C-231 List 1 features are affected when it is under management. Consult the
management unit practice for further information (see
page
67).
Fuse Alarm
Pin 32 on the card-edge connector is a fuse alarm that is driven to -48 Vdc through a diode whenever the onboard
fuse opens.
62
1 C
-E
IST
ARD
DGE
HDSL4 Loop 2Tip
HDSL4 Loop 2 Ring
Fuse Alarm*
HDSL4 Loop 1Tip 1
HDSL4 Loop1 Ring 1
DS1 Tip
DS1 Ring
Ground
DSX-1 NM Control Bus
DS1 Tip1
DS1 Ring1
* Fuse alarm is normally floating and at -48V when activated.
Figure 32. H4TU-C-231 List 1 Card-Edge Connector
September 12, 2003
C
ONNECTOR
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
11
37
12
KEY
KEY
38
13
-48V
39
14
-48V
40
15
41
16
Ground
42
17
43
18
44
19
45
20
46
21
47
22
Burn-in
48
23
49
24
50
25
"Appendix D - Product Support" on
LTPH-UM-1138-02, Issue 2
H4TU-C-231 List 1
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