Reference Manual

Transport network O&M functions-DXX Support
- Alarm indication signal (AIS)
The SES is performed in accordance with
[TIH_E1] and [TIH_T1].
DM One minute interval with one of the
following but not SES or UAT:
For E1 system:
- 123 CRC errors (when CRC is used)
- 2 faulty FSW (when CRC is not used)
and for T1 system:
- 52 CRC errors
CRCE Numbers of CRC errors from far end is
indicated by the E-bit in time slot 0. Only
used when the node is configured for
CRC-4.
RAI Number of seconds when Remote Alarm
Indication (RAI) has been received.
CV Number of line code errors (when the line
code has been violated). This is not
reported when the CRC-4 is used
(enabled).
CRC Number of Cyclic Redundancy Check
(CRC) block errors detected.
FSW Numbers of faulty frame synchronization
words. One count every time one or more
faulty bits in frame alignment word has
been detected.
FS Numbers of lost frame alignment. One
count every time the frame
synchronization is lost.
BUFIN Number of detected buffer slips on the
receiver interface (Rx).
57.4.9 DXX Fault masks
This function is initiated during restart of the DXU if the parameter
TNOM_use in RBS DB is already set to ON, otherwise the function is
initiated when the parameter is set to ON.
This function maintains fault mask filters, making it possible to inhibit
fault reporting. Two type of fault masks do exist;
• Fault freezing, and
• Fault masks
456 (485)
EN/LZT 720 0008 P2A
2001-11-28
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