Nortel 4000 Guida Utente
3-19
Chapter 3 Determining RAC Status
Managing Remote Access Concentrators Using Annex Manager
Interval Errors Box
The
Interval Errors
box provides T1 line statistics in the following
categories:
•
Interval Number
lists each 15-minute interval for which statistics
appear in this box. This column displays a number from 1 to 96,
Current
, or
Total
.
•
Out of Frame Errors
lists the number of Out of Frame (OOF)
events that occurred. An OOF event begins when the network
interface sends two of four incorrect consecutive frame
synchronizing bits, and ends when reframe occurs.
interface sends two of four incorrect consecutive frame
synchronizing bits, and ends when reframe occurs.
•
BiPolar Violations
lists the number of BiPolar Violation (BPV)
errors. For AMI-coded signals, a BPV event occurs when there
are two consecutive pulses of the same polarity. For B8ZS-
coded signals, a BPV event occurs when there are two
consecutive pulses of the same polarity that are not part of the
zero substitution code.
are two consecutive pulses of the same polarity. For B8ZS-
coded signals, a BPV event occurs when there are two
consecutive pulses of the same polarity that are not part of the
zero substitution code.
•
CRC Errors
lists the number of CRC errors. A CRC error occurs
when the CRC field calculated by the installation, based on the
incoming DS1 signal, does not agree with the CRC field
contained in the DS1 signal received from the network.
incoming DS1 signal, does not agree with the CRC field
contained in the DS1 signal received from the network.
•
Controlled Slip
lists the number of times the T1 engine replicates
or deletes a DS1 frame.
•
Path Code Violations
lists the number of coding violations that
occur on the remote side of a Layer 1 connection.
•
Line Code Violations
lists the number of coding violations that
occur on the local side. A Layer 1 connection does not need to
be established.
be established.