Hdsl4 System Testing; Figure 1. 3192 H4Tu-C; Figure 2. H4Tu-C Span Powering Diagram; Figure 3. H4Tu-C Bantam Jack Arrangement - ADTRAN H4TUC 3192 Installation And Maintenance Practice

The 3192 H4TU-C is capable of span powering the
H4TU-R and two H4Rs by applying current to the
local loop. From 30 to 155 mA of loop current is
coupled onto the HDSL4 span to power the H4TU-R
and two H4Rs when deployed. The span powering
voltage is less than –190 volts with GFI protection to
less than 5 mA. See Figure 2.
SPAN POWER
TC PAM
REGULATOR
HDSL4

Figure 2. H4TU-C Span Powering Diagram

H4TU-C Alarm Outputs
Each H4TU-C has a built-in fuse for the –48 VDC
power feed. A blown fuse indicates the card has
malfunctioned and should be replaced.
In order to avoid a shelf alarm, the H4TU-C element
can be provisioned to disable external alarms. This
will disable all DSX and DS1 alarms.

4. HDSL4 SYSTEM TESTING

The ADTRAN HDSL4 system provides the ability to
monitor the status and performance of the DSX-1
signals, DS1 signals, and HDSL4 loop signals.
Detailed performance monitoring is provided via
management access of the front panel RS-232 port.
These features are valuable in troubleshooting and
isolating any system level problems that may occur at
installation or during operation of the HDSL4 system.
The following subsections describe additional testing
features.
H4TU-C Bantam Jacks
The front panel of the H4TU-C contains metallic
splitting bantam jacks for both nonintrusive
(monitoring) and intrusive (terminating) DSX-1 test
access.
61222404L1-5B
Figure 3 illustrates the complete bantam jack
arrangement and details for specific jacks.
DSX-1
T
LOOP 1
R
SPAN CURRENT
T1
LOOP 2
R1
DSX-1

Figure 3. H4TU-C Bantam Jack Arrangement

H4TU-C Loopbacks
The H4TU-C responds to two different loopback
activation processes. First, loopbacks may be
activated using the craft interface of the 3192
H4TU-C. The Loopbacks and Test screen, which
provides for the H4TU-C and H4TU-R loopbacks, is
described in the Control Port Operation (HDSL4)
Section 5 of this practice.
Second, the H4TU-C responds to the industry
standard for HDSL4 loopbacks. A detailed
description of these loopback sequences is given in
Appendix A.
This unit is transparent to framing. If a framed or
unframed loopback control sequence is sent, the unit
will initiate the proper loopback command. (Refer to
Appendix A, Table A-1.)
T
R
DSX-1
H4TU-C
MON
Rx
EQ
Rx
H4TU-C
DATA
PUMP
EQ
Tx
DSX-1
MON
Tx
T1
R1
HDSL4
HDSL4
LOOP 1
LOOP 1
LOOP DC
POWER SOURCE
HDSL4
HDSL4
LOOP 2
LOOP 2
5