Ericsson MINI-LINK BAS, Техническое описание, Страница: 157 / 174

9-11 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
9.4 Performance Monitoring
Transmission performance according to ITU-T G.826 and I.356 ATM
is measured and logged. It specifies the error performance events,
parameters and objectives for paths operating at bit rates at or above
the primary rate.
The G.826 recommendation evaluates performance by measuring
errors in blocks. These have been defined as a set of consecutive bits
associated with the path. Each bit belongs to one only, block and
consecutive bits may not be contiguous in time.
The performance parameters are evaluated per FlexNU both in uplink
and downlink, as there are different physical links for each FlexNU.
In order to do this in the uplink the RN has to take in account the
transmitting FlexNU whereas in the downlink the FlexNU can
monitor all TDM slots.
Performance events provided for the ATM layers are:
•
Cell Error ratio
•
Cell Loss Ratio
•
UBR Discarded Cells
•
CBR Discarded Cells
Performance events, provided for the physical layer, are:
•
UAT/AT: Unavailability/Availability time;
•
ESR: Error Second Ratio;
•
SESR: Severely Error Second Ratio;
•
BBER: Background Block Error Ratio.
Some additional Performance parameters not foreseen by ITU
standards are evaluated:
•
Received RF power, Max, min., average
•
Output nominal RF power, Max, min., average