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Installing Multiplexers
I
R
NSTALLING A
HRU
Step
Procedure
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.
2
Plug your ESD wrist strap into the ESD above the HMU slot.
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
Refer to the HRU pinout in
64
U
(HRU)
EMOTE
NIT
Figure 40. Installing an HRU in a Remote Enclosure
Figure 40
January 12, 2001
Standard 400/200 Interface
56
54
52
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
15
14
Remote enclosure
12
10
8
6
4
2
* Chassis Ground may be tied to Earth Ground per local practice.
Note: Active pins are highlighted in black.
if remote chassis is not pre-wired.
LTPH-SM-1014-03, Issue 3
55
DS1TIP
53
XMT
51
49
DS1RING
47
HDSL2RING1
45
43
HDSL2TIP1
41
39
37
_ ( )
35
33
31
29
27
48V Local Power
25
23
21
19
_ ( )
17
Circuit Ground
15
DS1 RING1
13
HDSL1 RING
11
RCV
9
7
HDSL1TIP
5
DS1TIP1
3
1
Chassis Ground*
Installer Check ü ü ü ü
H
H
H
Continued
HMS-358 List 1 and List 2
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