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Powering Modes
The H2TU-C will automatically provide span
powering voltage. No voltage settings are required,
regardless of the presence of a H2R.
3. CONNECTIONS
The 3192 H2TU-C occupies one card slot in a CI
Wescom 3192 Office Repeater Bay. Power and alarm
signals are provided to the card through the backplane of
the shelf. DSX-1 and HDSL2 loop signals are connected
to the wire-wrap pins or mass termination shelf
connectors corresponding to the slot the unit occupies.
See Figure 3 for H2TU-C edge connector wiring.
The H2TU-C is capable of span powering the
H2TU-R by applying simplex current to the local
loop. From 10 to 150 mA of current is coupled onto
the HDSL2 span to power the H2TU-R when
deployed (see Figure 4).
H2TU-C Alarm Outputs
Pin 10 of the H2TU-C 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.
Pin H of the H2TU-C edge connector interface
provides a receive loss of signal (RCV LOS)
indication that connects -48 VDC to this pin when
RCV LOS is detected.
The HDSL2 Loop is a
full duplex loop (capable
of transmitting and receiving
data simultaneously).
Figure 3. H2TU-C Edge Connector Wiring
61222004L2-5A
R TX DSX (In from DSX)
1
R1 RX DSX (Out to DSX)
2
3
4
GND
5
6
7
-48V
8
R HDSL2 Loop
9
Fuse Alarm (to Alarm Module)
10
T TX DSX (In from DSX)
A
T1 RX DSX (Out to DSX)
B
C
D
E
F
RCV LOS (to Alarm Module)
H
Frame Ground
J
T HDSL2 Loop
K
L
Section 61222004L2-5, Issue 1
HDSL2
Figure 4. H2TU-C Span Powering Diagram
4. HDSL2 SYSTEM TESTING
The ADTRAN HDSL2 system provides the ability to
monitor the status and performance of the DSX-1
signals, DS1 signals, and HDSL2 loop signals.
Detailed performance monitoring is provided by the
faceplate mounted RS-232 Control Port. These
features are valuable in troubleshooting and isolating
any system level problems that may occur at
installation or during operation of the HDSL2 system.
The following subsections describe additional testing
features.
H2TU-C Bantam Jacks
The faceplate of the H2TU-C contains both
monitoring and metallic splitting Bantam jacks. In
general, the monitoring jacks provide a nonintrusive
tap onto a signal line that permits the connection of
test equipment to monitor the characteristics of that
signal. For example, the DSX-1 monitor jack can be
used to connect to a bit T1 Test Set to monitor for
synchronization, test patterns, etc. The jacks provide
an intrusive, signal interrupting access to the line.
SPAN CURRENT
TIP (+)
190V
SPAN POWER
RING (-)
K
9
5
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