Reference Manual

Transport network O&M functions-DXX Support
Fault freezing
It is in RBS possible to set a fault mask to freeze fault monitoring of a
specified block at a specified period of time. The blocks are PCM-A,
PCM-B and Common parts (SW faults). The time out value is 0 to
10 000 000 seconds.
With the fault freezing activated the fault status of the RBS is frozen,
i.e. the faults are neither updated nor reset. Fault monitoring is enabled
automatically after the time-out time has expired or immediately by the
management operation where the time-out time is set to zero.
Fault masks
It is possible from DXX to mask all faults from an RBS or from a
specific interface (i.e. prevent the interface from generating alarms). It
is also possible from DXX to specify certain individual fault masks.
When the fault mask is active the potential faults are neither supervised,
nor reported, except for an alarm indicating that the fault mask is
enabled.
The following attribute (status) have individual fault masks possible to
enable/disable on interface basis (PCM-A and PCM-B).
• AIS inhibit (also called AIS Failure fault mask):
When ON, a received AIS failure does not generate an alarm.
This parameter is OFF as a default.
• RAI inhibit (also called RAI fault mask):
When ON a received RAI does not generate an alarm. This
parameter is OFF as default.
The AIS inhibit or RAI inhibit does not generate the fault mask alarm.
51.4.10 DXX Loop back
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 controls line loop in the RBS interface PCM-A and PCM-
B, to be used for test purposes. The line loop, loops back all timeslots
except the TNOM timeslot. The timeslot 0 (for E1) and F bit (for T1)
are not looped back either. This loop is referred to as “DXX line loop”
or “DXX loop back to interface”.
The “DXX line loop” does not necessarily maintain the timeslot
integrity. During “DXX line loop”, the timeslots do keep their position
in the primary rate (1.5 or 2 Mbit/s) frame. Hence, incoming timeslot
17 has to be outgoing timeslot 17.
The delay in the RBS can be different for different timeslots. Hence,
timeslots that come in to the RBS in the same frame do not have to be
in the same frame when they leave the RBS.
The “DXX line loop” is controlled from DXX individually for PCM-A
and PCM-B. The loop is possible to set with a timeout value to release
the specific loop. The timeout value is between 1 and 65 000 minutes,
in steps of 1 minute.
EN/LZT 720 0008 R1A
2001-06-26
395 (421)
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