Channel number D2 format TN (S C U) D3, D4,E SF format TN (S C
U)
21 0 4 0 2 5 0
22 2 4 0 2 6 0
23 1 8 0 2 7 0
24 3 8 0 3 8 0
Use the error counter
The error counter detects bipolar violations or no-signal periods. It counts, stores, and displays
these occurrences to a maximum of 9999.
The PRI fault detection and isolation procedures described in this section are performed using
a portable test package, which consists of one each of the following items:
•
the TTT2028 Mini-Error Counter, plus operation instruction card
• a cord equipped with a bantam plug at one end and minihooks at the other
• a loopback plug (shorts pins 3 to 1 and 11 to 9 of a 15-pin D connector)
Using the error counter
Caution:
To prevent injury from voltage on the span, always connect the patch cord into the test set
before connecting the other end to the external signal source.
Plug one end of a patch cord into the input jack of the test set.
1. Plug the other end of the patch cord into one of the monitor jacks (RCV and XMT)
of the PRI card being tested.
2. Monitor the error counter LED indicators as described in Table 15: Error counter
switch functions on page 53
and
Table 16: Error counter display functions on
page
54.
Table 15: Error counter switch functions
Switch Function
Display Enable When held down, the switch enables the counter display
and the GOOD and O/R LED displays.
Reset Used to zero the counter.
Error/Error Used to select error counting seconds for bipolar
violations or error-seconds.
Use the error counter
ISDN Primary Rate Interface Maintenance November 2011 53
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