American Telecom AM64/128A User Manual
Page 23
AM64/128A User Manual
Test Menu
23
The Data Test can be used to test the performance of a link (0 or 1 patterns on the two wire line are all
AMI encoded and framed as described in section 3).
Note: Apply any loops required before entering Data Test Mode.
Enter the test menu and scroll to :
T> Data Test
then press SELECT.
There are four displays within this Data Test sub-mode:
1.
Error display
2.
Pattern display
3.
Transparency display
4.
Time display
Once the mode is entered, these displays can be changed by using the scroll keys in exactly the same
fashion as in the main menus. The mode can be exited at any point by pressing one of the MENU keys.
This returns the display to the line Data Test in the test menu.
1/ Error display
The BBM injects a binary 0 pattern immediately the mode is entered. The TM LED should light to verify this.
The display should then be
Errors nnnnnn
The number of bits received in error is nnnnnn. If the line is error free then the display will remain at
000000.
The SELECT key now performs two functions:
a). On the first press it will hold the current error count and time, (and stop counting further errors).
A small “s” is displayed just prior to the error count to show this.
For example
Errors s000001
b). On the second press the error count and time will be reset, and the test restarted.
If the error count overflows the display will indicate a “>” character just before the error count.
For example
Errors > 000001
Note : once the error count has overflowed, no significance should be attributed to the number
displayed. (It does not simply wrap around at 999999).