HDSL 3192 HTU-C Installation and Maintenance Practice
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3192 HTU-C Loopbacks
The 3192 HTU-C responds to two different loopback activation processes. First, loopbacks
may be commanded manually using the control port interface.
Options Screen which provides for 3192 HTU-C, HTU-R, and HRE loopbacks.
Second, the 3192 HTU-C responds to the industry standard sequences for HDSL loopbacks.
These loopback sequences are described in detail in
of this
practice.
The loopback condition imposed in both cases is a logic level loopback at the point within the
3192 HTU-C where the DSX-1 signal passes into the HDSL modulators.
depicts all
the loopback locations possible with ADTRAN HDSL equipment.
In addition to network-side loopbacks, the 3192 HTU-C provides customer-side loopbacks
initiated by using the terminal control port. In this mode, an AIS signal is supplied to the
network. Customer-side loopbacks must be deactivated using the terminal.
NOTE
When the 11000 in-band code is used to loop the HTU-R, the HTU-R
re-enters armed state upon loopback timeout, or upon terminal
deactivation. Refer to
for a more
detailed description of loopback element states.
