ADTRAN 3192 H4TU-C, Установка и эксплуатация

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6 Issue 1, December 2003 61223404L2-5A
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) of this practice.
• Second, the 3192 H4TU-C responds to the industry
standard patterns for HDSL4 loopbacks. A detailed
description of these loopback sequences is given in
Appendix A , HDSL4 Loopbacks .
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
Table A-1 in Appendix A ).
The loopback condition imposed in all cases is a logic
level loopback at the point within the 3192 H4TU-C
where the DSX-1 signal passes into the HDSL4
modulators.
Figure 5 depicts all of the loopback
locations possible with ADTRAN HDSL4 equipment.
In addition to network-side loopbacks, the ADTRAN
3192 H4TU-C provides customer-side loopbacks
initiated by using either the terminal control port or in-
band loop codes (refer to
Appendix A ). In this mode, an
AIS signal is supplied to the network.
Figure 5. HDSL4 Loopbacks
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
DSX-1
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
AIS
X
H4R Customer-Side Loopback
DS1
AIS
AIS
H4TU-C
H4R Network-Side Loopback
H4TU-R
DS1 DSX-1
DSX-1
H4R
AIS
AIS
AIS
X
H4TU-C H4TU-R H4R
H4R1 Network-Side Loopback
DS1 DSX-1
H4TU-C H4TU-R H4R1 H4R2
AIS
X
H4R1 Customer-Side Loopback
DS1 DSX-1
H4TU-C H4TU-R H4R1 H4R2
X = Signal Inactive
X
AIS
H4R2 Network-Side Loopback
DS1 DSX-1
H4TU-C H4TU-R H4R1 H4R2
AIS
X
H4R2 Customer-Side Loopback
DS1 DSX-1
H4TU-C H4TU-R H4R1 H4R2
X