Installation; Figure 4. Htu-C Card Edge Connections - ADTRAN AHT1U Installation & Maintenance

3. INSTALLATION

After unpacking the unit, inspect it for possible
shipping damage. Make sure the desired Litespan
HTU-C list number appears at the top of the faceplate.
If damage is discovered, file a claim immediately with
the carrier, then contact ADTRAN Customer Service
(see subsection 10 of this practice).
The Litespan HTU-C plugs directly into a Litespan
channel bank assembly channel unit slot. Litespan
system software must be 7.1.3, or higher. See Figure
4 for card edge connections.
Upon insertion of an HTU-C, the FAIL LED should
turn on immediately. The FAIL LED will remain on
until the Litespan bank recognizes the insertion of the
card and downloads the AHT1U channel unit type
code into the linecard. Typically, the FAIL LED will
remain on for approximately 15 to 20 seconds (time
may vary). Approximately 3 to 4 seconds after the
FAIL LED turns off, the HDSL LED will turn on red
and remain so until the HTU-C and HTU-R units
synchronize with each other over both HDSL loops.
P1, Row A
1
Frame Ground
2
Tip 1 Narrowband
3
Ring 1 Narrowband
4
Tip 2 Narrowband
5
Ring 2 Narrowband
6
7
8
9
10
11
12
13
Switch Battery (-48 VDC)
14
15
Positive Relay VCC (+5 VDC)
16
-5 VDC
17
Active A side signal
18
Logic and 5V system ground
19
A-side transmit circuit clock (4.096 MHz)
20
A-side receive circuit clock (4.096 MHz)
21
Logic and 5V system ground
22
A-side frame sync (1 kHz)
23
A-side receive data channel (8.192 MHz)
24
25
26
27
A-side transmit data channel (8192 MHz)
28
29
30
31
+5VDC (precharge pin)
32
4
P1, Row B
Surge Ground
33
Frame Ground
34
Test Bus for Loop 1 (tip)
35
Test Bus for Loop 1 (ring)
36
Test Bus for Loop 2 (tip)
37
Test Bus for Loop 2 (ring)
38
39
40
41
42
43
44
45
Switch Battery Return (-48 VDC return)
46
47
48
-5 VDC
49
Active B side signal
50
Logic and 5V system ground
51
B-side transmit circuit clock (4.096 MHz)
52
B-side receive circuit clock (4.096 MHz)
53
Logic and 5V system ground
54
B-side frame sync (1 kHz)
55
B-side receive data channel (8.192 MHz)
56
57
58
59
B-side transmit data channel (8.192 MHz)
60
61
62
63
+5 VDC
64

Figure 4. HTU-C Card Edge Connections

Section 61245002L6-5, Issue 3
CAUTION
Prior to installing or removing the Low
Voltage Litespan HTU-C, make sure to
observe the following warning:
If the Low Voltage Litespan HTU-C is
removed from a linecard slot, wait at least 15
seconds before reinsertion If connected to the
MTI craft interface terminal, wait until the
message "AID:MJ,UEQ.."appears (where
"AID" is the access identifier). This informs
the Litespan common control assembly that
the HTU-C has been removed from its slot,
after which the common control assembly
begins looking for the reinsertion of the
linecard. Reinsertion any earlier than this
may temporarily lock the HTU-C into a
nonfunctional state because the common
control assembly will not send the AHT1U
equipment type code to the HTU-C linecard.
P1, Row C
65
Frame Ground
66
67
68
69
70
Tip 1 Wideband
71
Ring 1 Wideband
72
Tip 2 Wideband
73
Ring 2 Wideband
74
75
76
77
78
79
80
-5 VDC
81
T1 clock A-side (6.176 MHz)
82
Logic and 5V system ground
83
T1 clock B-side (6.176 MHz)
84
T1 frame sync A-side (8 kHz)
85
Logic and 5V system ground
86
T1 frame sync B-side (8 kHz)
87
88
89
90
91
92
93
94
95
+5 VDC
96
61245002L6-5C