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7-1
7924-A2-GB20-30
October 1997
Testing
7
Detecting a Problem
The unit can detect and report problem conditions and perform diagnostic tests.
The unit offers a number of indicators to alert you to possible problems, as
described in Chapter 6,
Monitoring the Unit
:
H Front Panel LEDs
H Board status and performance statistics
H Remote unit board status and performance statistics
Understanding Loopback Tests
Loopback is a diagnostic function that enables a technician to isolate equipment
on the HDSL circuit to determine where on the circuit trouble may be occurring.
Loopback takes the system off-line. Data received from the DTE (T1 or V.35
application equipment) is looped back, as depicted in Figures 7-1 through 7-4.
“Local” and “remote” refer to the point at which the data is looped back. In a local
loopback the data is reflected back by the local unit (the unit that initiated the
loopback). In a remote loopback, the data is passed on to the remote (far-end)
unit and then reflected back.
Loopback tests are initiated through the terminal interface from either the CO or
CP side of the HDSL connection.