LTPH-SM-1052-04
Installing
Multiplexers
HMS-358 List 5 and List 6
July 14, 2002
55
I
NSTALLING
A
R
EMOTE
U
NIT
(HRU)
Figure 37.
Installing an HRU in a Remote Enclosure
Step
Procedure
Installer Check
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 user manual 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.
Continued
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*
HRU
Remote
enclosure
