Figure 5. H2Tu-C Bantam Jack Arrangement; Figure 6. Hdsl2 Loopbacks - ADTRAN 3192 H2TU-C Installation And Maintenance Manual

Figure 5 illustrates the complete Bantam jack
arrangement and details for specific jacks.
T1
DSX-1
R1
DSX-1
MON
RX
EQ
RX
EQ
TX
DSX-1
MON
TX
T
DSX-1
R

Figure 5. H2TU-C Bantam Jack Arrangement

H2TU-C Loopbacks
The H2TU-C responds to two different loopback
activation processes. First, loopbacks may be
activated using the craft interface. The Loopback
Options Screen which provides for the H2TU-C and
H2TU-R loopbacks, is described in Section 5 of this
practice.
Second, the H2TU-C responds to the industry defacto
standard for HDSL loopbacks. A detailed description
of these loopback sequences is given in Appendix A.
6
H2TU-C
HDSL2
DATA POWER
PUMP
Section 61222004L2-5, Issue 1
The loopback condition imposed in both cases is a
logic level loopback at the point within the H2TU-C
where the DSX-1 signal passes into the HDSL2
modulators. Figure 6 depicts all of the loopback
locations possible with ADTRAN HDSL2 equipment.
In addition to network-side loopbacks, the H2TU-C
provides customer-side loopbacks initiated by using
the terminal control port (see Appendix A). In this
mode, an AIS signal is supplied to the network.
H2TU-C Network-Side Loopback
DSX-1
H2TU-C
H2TU-R Network-Side Loopback or
H2TU-R NIU Loopback
DSX-1
H2TU-C
H2TU-R Customer-Side Loopback
X
DSX-1
AIS
H2TU-C
H2TU-C Customer-Side Loopback
X
DSX-1
AIS
H2TU-C
H2TU-R Bidirectional Loopback
DSX-1
H2TU-C
X = Signal Inactive

Figure 6. HDSL2 Loopbacks

AIS
LOCAL
DS1
LOOP
X
H2TU-R
AIS
LOCAL
DS1
LOOP
X
H2TU-R
LOCAL
DS1
LOOP
H2TU-R
LOCAL
DS1
LOOP
H2TU-R
LOCAL
DS1
LOOP
H2TU-R
61222004L2-5A