Connections; Figure 3. Htu-C M R Edge Connector Wiring; Figure 4. Htu-C M R Span Powering Diagram - ADTRAN HTU-C M R Installation And Maintenance Manual

3. CONNECTIONS

The 220/E220 HTU-C M R occupies one card slot
in a 220 Office Repeater Bay. Power and alarm
signals are provided to the card through the
backplane of the shelf. DSX-1 and HDSL loop
signals are connected to the wire-wrap pins or mass
termination shelf connectors corresponding to the
slot the unit occupies. Connections to the DSX-1
pins are intended for intra-building wiring only. See
Figure 3 for HTU-C M R edge connector wiring.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Loop 1 HDSL Tip (Wire-Wrap)
26
Loop 1 HDSL Ring (Wire-Wrap)
27
28
29
30
31
32
33
Loop 2 HDSL Tip (Wire-Wrap)
34
Loop 2 HDSL Ring (Wire-Wrap)
35
36
37
38
39
40
41
DSX-1 Rx Tip (Wire-Wrap)
42
DSX-1 Rx Ring (Wire-Wrap)
43
44
45
46
47
48
DSX-1 Tx Tip (Wire-Wrap)
49
DSX-1 Tx Ring (Wire-Wrap)
50

Figure 3. HTU-C M R Edge Connector Wiring

61245001L6-5G
-48 RET
Fuse Alarm
-48V(1)
Input to HTU-C
Input to HTU-C
-48 RET
Output from HTU-C
Output from HTU-C
Section 61245001L6-5, Issue 7
The HTU-C M R is capable of span powering the
HTU-R by applying simplex current to the local
loop. 10 to 125 mA of current is coupled onto the
HDSL span to power the HTU-R and HRE when
deployed. The span powering voltage can be
configured to be either less than -140 volts or -190
volts with Loop 1 providing the negative voltage
and Loop 2 the return (see Figure 4).
HTU-C M R Alarm Outputs
Pin 32 of the HTU-C M R edge connector interface
provides a fuse alarm signal that connects -48 Vdc
to this pin in the presence of a blown fuse. This
indicates the card has malfunctioned and should be
replaced.
SPAN POWER
2B1Q
REGULATOR
HDSL

Figure 4. HTU-C M R Span Powering Diagram

HFAC Alarm Outputs
If the HTU-C M R is operating in an ADTRAN
E220 or E220 RP Shelf with an HFAC
(P/N 1244051LX or equivalent), the HTU-C M R
provides information to the HFAC which is used to
generate alarms. The HFAC alarm outputs are
separate from the HTU-C M R alarm pin mentioned
above. For more information on the HFAC
controlled alarms, see the HFAC Installation and
Maintenance practice, ADTRAN document number
61244051LX-5.
T (26)
LOOP 1
R (27)
SPAN CURRENT
T1 (34)
LOOP 2
R1 (35)
5