CANOGA PERKINS 2461 E1 Modem - Manual (Page 43)

EdgeAccess Universal Chassis System
2461 Modem User Manual 5-1
5 Chapter 5
Diagnostics
The 2461 modem has several diagnostic test options for determining the source and cause of data
transmission errors. Some of these tests are being performed automatically while others require a
test technician.
5.1 Link Self Test
The Link Self Test, also referred as the auxiliary BERT, is continuously running on a free
and reserved channel on the fiber optic payload and a trap message will go out when the
error count is greater than zero.
The BERT pattern is proprietary to Canoga Perkins and runs at 64Kbps. The BERT detector will
be read once a second. It is a 7 bit counter (up to 127). If the fiber composite signal is out of sync,
the BERT detector will be in N/A State.
The software will also come up with an out of sync condition whenever the BERT error count per
second is greater than 6. 6/64000 ~= 1/10000 which is an error rate of 1 x 10
-4 .
5.2 Link Error Counter
The menu in Figure 29 provides continuous error counters for a variety of errors. To begin error
counting, reset the timer and counter and let the counter run, tallying the errors.
To record the number of link errors for both local and remote modems:
1. From the Modem Main Menu, type "3." The Link Error Counter appears.
Figure 31. The Link Error Counter Screen, shown here in a redundant system