Overview
150-231-165-01, Revision 01
6
September 22, 1998
HLU-231 List 6E
HLU-231 List 6E Card Connector
shows the card-edge connectors on the HLU-231. Active pins are highlighted in black.
Figure 2.
HLU-231 List 6E Card-Edge Connector
Fuse Alarm
Pin 32 on the card-edge connector is a Fuse Alarm that is driven to -48V through a 1000
Ω
resistor whenever the
onboard fuse opens.
RLOS
Remote Loss of Signal
Indicates that no signal is detected at the T1 input to the HRU. Causes a minor alarm.
DS1
DS1 BPV errors
Indicates that the number of BPVs at the HLU or HRU DS1 inputs have exceeded the
24 hour ES threshold. Causes a minor alarm.
DS0
DS0 Blocked Channels
Indicates status of DS0 blocked channels. NONE indicates no channels are blocked.
BLK indicates some channels are blocked.
MAL1(2)
Margin Alarm Loop 1 or 2
The margin on HDSL loop 1 (2) has dropped below the threshold (1 to 15 dB) set by
the user.
Table 4.
Front Panel Display Messages (Cont.)
Message
Full Name
Description
14
15
16
17
18
19
20
21
22
23
24
25
DS1 TIP
GROUND
BURN-IN (do not use)
DS1 RING
Ground
DS1 TIP1
DS1 RING1
39
40
41
42
43
44
45
46
47
48
49
50
-48V
1
2
3
4
5
6
7
8
9
10
11
HDSL2 TIP
HDSL2 RING
FUSE ALARM*
HDSL1 TIP 1
HDSL1 RING 1
KEY
KEY
26
27
28
29
30
31
32
33
34
35
36
37
38
12
13
ALARM**
* Fuse alarm is normally floating and at -48V when activated.
** Minor alarm contacts (pins 20 and 21) are normally open and close
upon alarm.
DSX-1