User Manual

Airlink Pro T1/E1 Rack Mount Installer’s Guide
Operations and Maintenance
Rev. B - 1/97
4-13
you query performance at this point, you should see that the counter has been
reset.
To reset the 1-hour and 24-hour ES and UAS counters, type the following
command at the AirLink Pro T1/E1 prompt:
AIRLINK PRO T1/E1> reset performance
The system prompts you to confirm the reset request:
AIRLINK PRO T1/E1> reset performance
Reset performance: Are you sure? (Y/N)
When you enter y (yes) to confirm the request, the system clears the ES and
UAS counters. If you enter n (no) or just press <Return>, the system ignores the
reset request. If you query performance at this point, you should see that the 1-
hour and 24-hour ES and UAS counters have been reset.
Diagnostic Tools
The AirLink Pro T1/E1 Rack Mount provides the following diagnostic tools:
❚ A QRSS test
❚ Two loop tests
The QRSS test and the loopback tests are initiated by commands entered
through the terminal user interface.
NOTE Only one test can be active at a time. If you attempt to start up a second test while a test
is running, the system terminates the first test and activates the second test.
Radio QRSS Testing
The QRSS signal is the Telco industry standard QRS test signal as defined in
ANSI Standard T1.403-1989. It is a 1,048,575-bit sequence generated by a 20-
stage shift register with feedback taps on stage 17 and 20. The sequence is
further altered to permit no more than 14 consecutive zeros. A QRSS test checks
the continuity and performance of a link (Figure 4-5). In QRSS testing, the
network traffic signal is interrupted and customer data on the radio signal is
replaced with a QRSS signal. When a QRSS test is initiated, QRSS
(unframed) is sent to the DTE. This causes a frame loss on any associated DTE
equipment that expects a framed DS1 signal thereby forcing an alarm condition.
This forces the equipment to go out of service.