JDS Uniphase SmartClass E1, User Manual

Page: 57 / 144

Chapter 4 E1 Testing
Line loopback testing
SmartClass E1 Tester User’s Guide 41
10 Restart the test.
This will clear all alarms/defects and begin a new test.
11 To insert defects or anomalies, press the Action key, and then select the
anomaly or defect. The selections depend on your selection on the Error
Settings menu.
12 If the circuit is physically looped back, check to see that the inserted errors
are received in the Summary test result category (For instructions on
viewing results, see
“E1 Results” on page 78 ). If you are performing an
end-to-end test, verify that the SmartClass E1 units at each end of the
circuit received the inserted errors.
BER testing is complete.
Line loopback testing
Line loopback testing allows you to loop the entire E1 circuit. This configuration
will loop the incoming data back out the transmitter yet still allow the receiver
to monitor the incoming signal. Line code errors will not be corrected, jitter will
not be cleaned up, and the signal will be regenerated but data will not be
inserted on the line. While in this mode, the E1 Tester will present minimal
delay. You must use the RX1/TX1 port for Line Loopback testing.
The following procedure describes how to perform a line loopback test.
To perform a line loopback test
1 Launch the E1 BERT application. See “Launching an E1 test application”
on page 28 .
2 On the test menu, select Configuration.
The Configuration menu appears.
3 On the Configuration menu, select Test Modes .
A list of test modes appears.
4 Select
Line Loopback
.
5 Connect the E1 Tester to the test access point, using the RX/TX1
connector.
6 Restart the test.
This will clear all alarms and begin a new test.
7 To view results, see “E1 Results” on page 78 .
Line loopback testing is complete.
NOTE:
The SmartClass E1 Tester will first attempt to insert a clean code error (with-
out a bit error). If, after a time-out period of 256 bits, this is not possible, the
unit will insert a code plus a bit error (a line error). This timeout would occur
if an unframed all zeros pattern is currently being transmitted.