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ADTRAN HDSL4 Manuel d'utilisateur Page 6

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6 61181412L1-5B
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 Total Access 3000 SCU.
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.
See Appendix B for detailed information regarding the
testing capabilities of the bantam jacks.
Figure 3 illustrates the complete bantam jack
arrangement and details for specific jacks.
H4TU-C Loopbacks
The H4TU-C responds to two different loopback
activation processes. First, loopbacks may be
activated using the craft interface of the Total Access
3000 SCU. The Loopbacks and Test Screen, which
provides for the H4TU-C and H4TU-R loopbacks, is
described in 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.
Even though all framing modes do not provide frame
transparency, if a framed or unframed loopback
control sequence is sent, then the unit will initiate the
proper loopback command (Refer to Appendix A,
Table A-1), regardless of the framing mode.
The loopback condition imposed in all cases is a logic
level loopback at the point within the H4TU-C where
the DSX-1 signal passes into the HDSL4 modulators.
Figure 4 depicts all of the loopback locations possible
with ADTRAN HDSL4 equipment.
Figure 4. HDSL4 Loopbacks
Figure 3. H4TU-C Bantam Jack Arrangement
DSX-1
MON
Rx
H4TU-C
DATA
PUMP
LOOP DC
POWER SOURCE
DSX-1
T
R
DSX-1
T1
R1
HDSL4
LOOP 1
HDSL4
LOOP 2
H4TU-C
HDSL4
LOOP 1
HDSL4
LOOP 2
EQ
Rx
DSX-1
MON
Tx
EQ
Tx
X
H4R2 Customer-Side Loopback
DSX-1
AIS
H4TU-C H4R2
DS1
H4TU-RH4R1
X = Signal Inactive
H4R2 Network-Side Loopback
DSX-1
H4TU-C H4R2
DS1
AIS
AIS
H4TU-RH4R1
X
H4R1 Customer-Side Loopback
DSX-1
AIS
H4TU-C H4R2
DS1
H4TU-RH4R1
H4R1 Network-Side Loopback
DSX-1
H4TU-C H4R2
DS1
H4TU-RH4R1
X
X
DSX-1
H4TU-C
LOCAL
LOOP
H4TU-C Network-Side Loopback
H4TU-R
H4TU-C
LOCAL
LOOP
H4TU-R Customer-Side Loopback
H4TU-R
H4TU-C
LOCAL
LOOP
H4TU-C Customer-Side Loopback
H4TU-R
X
X
DS1
DSX-1
H4TU-C
LOCAL
LOOP
H4TU-R Network-Side Loopback and/or
H4TU-R NIU Loopback
H4TU-R
X
DS1
DS1
DS1
X
AIS
X
H4R Customer-Side Loopback
DS1
H4TU-C
H4R Network-Side Loopback
H4TU-R
DS1DSX-1
H4R
DSX-1
AIS
DSX-1
AIS
DSX-1
AIS
AIS
AIS
X
H4TU-C H4TU-RH4R
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