FMUX/S-4E1-E2 Multiplexer
1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567
1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567
Copyright © 2007 Cronyx
33
4.7. 'Test' menu
The '
Test
' menu is designed to control the BER tester.
Bit Error Test
Mode: Normal; Sensor=Open
Link: LOF,
Test error rate=0.0, Time total/loss=00:00:46/3, Bit errors=0
Time total: 00:00:46
Sync loss: 00:00:03
Bit errors: 0
Error rate: 0.0
1. Testing: Enabled
2. Error insertion rate: No errors inserted
3. Insert single error
4. Test pattern: Pseudo-random
<C> - clear errors counter, <R> - refresh mode, <Enter> - exit
The information on the screen is updated once per three seconds. To return to the upper-
level menu, you must press <Enter> (or <Return>). Press 'R' to toggle the imposition
mode. In the imposition mode the screen will not be cleared when information is updated.
To reset the statistics counters to zero, press 'C'.
The '
Testing: ...'
command enables or disables the test pattern generation.
The
'Error insertion rate: ...'
command selects the error insertion rate, 10
-7
to 10
-1
errors/bit, or disables the error insertion mode – in this case the 'No errors inserted' mes-
sage is output instead of a numerical value.
The
'Insert single error'
command inserts a single error.
The
'Test pattern: ...'
command allows using a pseudo-random code as a test pattern, or
specifying a fixed 8-bit code.
Test results information is displayed in the following lines:
•
'Time total: ...'
– total testing time;
•
'Sync loss: ...'
– time during which test pattern synchronization has been lost;
•
'Bit errors: ...'
– data error counter;
