Reference Manual

Transport network O&M functions-DXX Support
The fault conditions monitored within the common parts of the RBS are:
•
Flash check sum error
A problem has been found when saving parameters to the
non-volatile memory.
• Reset
There has been a unit reset (detected always after the power-up of
the unit), and the TN O&M functions has restarted. The reset is
reported as a delta alarm event. With delta alarm event means an
event has occurred but is still not active.
The fault conditions monitored within the interfaces PCM-A and PCM-B
of the RBS are:
•
Rx signal missing (LOS)
According to [TIH_E1] and [TIF_T1].
•
Frame alignment lost (LOF)
According to [TIH_E1] and [TIF_T1].
•
Rx signal AIS
According to [TIH_E1] and [TIF_T1].
•
BER 10¯³ (ERATE)
According to [TIH_E1] and [TIF_T1]. When CRC-4 is enabled
the CSES is used in accordance with [TIH_E1].
•
Remote Alarm Indication (RAI)
According to [TIH_E1] and [TIF_T1]
• Loop - Mux/Demux back to line
This status is activated when the DXX loop is activated. Rx data
is looped back to the interface transmitter.
• G.821 limit event
This fault will be activated as a delta event when at least one
G.821 performance limit has been exceeded in a 15–minute
period. See also Section 51.4.8 on page 391. With delta alarm
event means an event has occurred but is still not active.
• G.821 Unavailable state (UAST)
This signal will be activated when the state of the signal becomes
unavailable. The fault will be deactivated when the state becomes
available again. Unavailable state is declared at the onset of 10
consecutive SES. These 10 seconds are considered to be part of
the unavailable time.
• Fault masked/test
This fault will be activated when the interface fault mask setting
is ON (all interface faults will be cleared).
390 (421)
EN/LZT 720 0008 R1A
2001-06-26
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