800-357-104-01, Revision 01
HMS-357 List 4 and List 5
September 29, 2000
57
I
NSTALLING
A
R
EMOTE
U
NIT
(HRU)
Figure 36.
Installing an HRU in a Remote Enclosure
Step
Procedure
Installer Check
ü
ü
ü
ü
Whenever installing or removing units from a remote enclosure, be sure to wear an
antistatic wrist strap and connect it to the ESD strap input.
1
Open the remote enclosure cover.
H
2
Plug your ESD wrist strap into the ESD above the HMU slot.
H
3
Set the user options for status LEDs. Refer to the HRU technical practice for details. User options
usually include setting the:
•
DS1 receive level
•
TLOS
•
Sealing current
•
Local or line power selection
H
Refer to the HRU pinout in
if remote chassis is not pre-wired.
4
Slide the remote unit into the card guides for the desired slot, then push the unit into the enclosure
until it is seated in the card-edge connector. The unit should snap into place, indicating that the unit
is properly seated. The HRU should power up within 30 seconds.
H
Remote enclosure
HRU
13
11
9
7
5
3
1
XMT
RCV
12
10
8
6
4
2
39
37
35
33
31
29
27
25
23
21
_
( )
DS1TIP
DS1RING
40
38
36
34
32
30
28
26
24
22
20
18
15
14
19
17
15
* Chassis Ground may be tied to Earth Ground per local practice.
Note: Active pins are highlighted in black.
Standard 400/200 Interface
47
45
43
41
48
46
44
42
53
51
49
54
52
50
55
56
HDSL2RING1
HDSL2TIP1
48V Local Power
_
( )
_
Circuit Ground
DS1 RING1
HDSL1 RING
HDSL1TIP
DS1TIP1
Chassis Ground*
