User guide

Chapter 11: Board Configuration
MAXCS ACC 6.7.1 Administration Manual 119
Reading the Statistics
The Statistics panel displays the number of errors that have occurred since the last
system reboot or statistics clearing. There may be non-zero values when configuring the
T1 span for the first time. You can clear these fields with the Clear button.
Error Meaning
Frame Errors
Number of framing bit errors. In T1 mode, a framing bit error is de-
fined as an incorrect FS-bit value. The counter is suppressed when
framer loses frame alignment
OOF Errors
The Out Of Frame counter registers every time the T1 chip is forced
to re-frame when receiving a frame with severe errors.
Rec Frame Slips
The Receiver Frame Slips counter shows the number of frame slips
for the receiver.
Line Code Errors
Line Code Error is defined as an occurrence of a bi-polar variation
or excessive zeroes.
Bit Errors
Bit Errors are defined as a CRC-6 error in ESF, FT-bit error in SLC-
96 and F-bit or sync bit error in SF.
Xmt Frame Slips
Transmit Frame Slips counter shows the number of frame slips for
the transmitter
Clear button Use the Clear button to reset the statistics counters.
Note: For ideally synchronized systems, Transmit and Receive Frame Slips coun-
ters should be ‘0.’ Continuous update of the frame slips counters means that
transmit and receive frequencies are not equal. In this case, check the system
and CT-Bus clock setup.
L1 failure: <Remote
Alarm Indication
(RAI)>
Layer 1 failure, CO notifies
that the configuration is
wrong; RAI = Remote Alarm
Indicator
Correct the settings.
L1 failure: <No Sync
Frames
Layer 1 failure, physical layer;
no valid framing is detected.
Possible span mis-configuration
(ESF is selected but the actual
framing is SF, or vice versa).
Check span configuration.
L1 failure: <Red
Alarm>
Layer 1 failure, physical layer;
Bi-Polar Violations (BPV), Line
Code Violations (LCV), or Out
Of Frame detected
Location condition, equipment
problem.
- For excessive BPV/LCV, check
AMI/B8ZS setting.
- For OOF, check the MVIP bus
master setting.
OR
Have CO perform a line test to
check for a faulty cable or line.
[PRI only]
L2 Failure: <No Sync
Flag>
Layer 2 failure, data link layer;
no sync flag has been detected
in data link layer
Check if D-channel is active or
not
[PRI only]
L2 Failure: <Not
established>
Layer 2 failure, data link layer;
the peer-to-peer link has not
established in data link layer
CO must activate HDLC link
Error Message Meaning Action