ITU-Y.1731
This standard defines the mechanisms to measure performance on Ethernet networks. The Key Performance Indicators (KPI) are Frame Loss, Frame Delay and Frame Delay Variation. Frame Loss errors can occur at Near-End or Far-End locations and it is important to correlate the time at which the events occur. Tight correlation is necessary to achieve five-nines level of accuracy.
Mingoa's hardware measures KPIs to five-nines accuracy using hardware timestamps and in-line data
frame counters. Five-nines level of accuracy is not easily guaranteed with software based solutions (this is
described in our Whitepaper). Our hardware measures KPIs on
hundreds of monitored links without compromising the data throughput.
Frame Loss is measured using CCM messages or LMM/LMR messages. Our hardware maintains
accurate transmit and receive data counters per monitored service and these counter values
are exchanged in the Frame Loss messages. The Frame Loss is calculated based on the number
of data packets lost between successive CCM or LMM/LMR messages. Both Near-End and Far-End
Frame Loss measurements are made. The hardware correlates these measurements and reports
the results in a manner similar to TDM style SLA reporting.
Frame Loss can also be measured using Loopback messages.
However, this does not produce as accurate a result as the CCM or LMM/LMR schemes, as the
loss is measured on the loopback messages alone rather than the data packets.
Frame Delay and Frame Delay variation can be measured using DMM/DMR, IDM or Loopback messages.
The hardware maintains a real time clock and this value is exchanged in the DMM/DMR and IDM
messages. Delay and delay variation is measured accurate to sub 1us levels. Delay variation
is measured between successive messages and reported as Inter Packet Delay Variation.