Paradyne 7924 manual Testing, Detecting a Problem, Understanding Loopback Tests

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:

HFront Panel LEDs

HBoard status and performance statistics

HRemote 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.

ªLocalº and ªremoteº 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.

7924-A2-GB20-30 October 1997 7-1