ADTRAN 3192 H2TU-C, Руководство по установке и обслуживанию

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6 Section 61222004L2-5, Issue 1 61222004L2-5A
Figure 5 illustrates the complete Bantam jack
arrangement and details for specific jacks.
Figure 5. H2TU-C Bantam Jack Arrangement
DSX-1
MON
RX
H2TU-C
DATA
PUMP
DSX-1
T1
R1
DSX-1
T
R
HDSL2
EQ
RX
DSX-1
MON
TX
EQ
TX
POWER
Figure 6. HDSL2 Loopbacks
DSX-1
H2TU-C
LOCAL
LOOP
H2TU-C Network-Side Loopback
H2TU-R
H2TU-C
LOCAL
LOOP
H2TU-R Customer-Side Loopback
H2TU-R
H2TU-C
LOCAL
LOOP
H2TU-C Customer-Side Loopback
H2TU-R
X
X
DS1
DSX-1
H2TU-C
LOCAL
LOOP
H2TU-R Network-Side Loopback or
H2TU-R NIU Loopback
H2TU-R
X
DS1
DS1
DS1
X
AIS
AIS
AIS
AIS
X = Signal Inactive
H2TU-C
LOCAL
LOOP
H2TU-R Bidirectional Loopback
DS1 DSX-1
DSX-1
DSX-1
H2TU-R
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.
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.