Ericsson MINI-LINK 6351 Technical Description page 33

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The radio supports storing a large amount of Performance Measurement (PM)
data, including the following:
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information, it also expects to receive frames with DM information from its
peer MEP in the same ME.
A MEP sends frames with DM request information to its peer MEP, and
receives frames with DM reply information from its peer MEP to perform
two-way frame delay and two-way frame delay variation measurements.
The Protocol Data Unit (PDU) used for DM request is Delay Measurement
Message (DMM). The PDU used for DM reply is Delay Measurement
Response (DMR).
Single-Ended Loss Measurement (LM), including Loss Measurement
Message (LMM) and Loss Measurement Response (LMR), is used to
collect counter values applicable to ingress and egress service frames,
where the counters maintain a count of transmitted and received data
frames between a pair of MEPs. single-ended LM is used for on-demand
OAM. In this case, a MEP sends frames with LM request information to its
peer MEP and receives frames with LM reply information from its peer
MEP to perform loss measurement.
Note: LM can be performed in two ways: single-ended LM and
dual-ended LM. The radio only supports single-ended LM.
Delay and delay variation measurements:
Average, maximum and minimum measured round trip delay of the
interval
Average, maximum and minimum measured round trip Inter Frame
Delay Variation (IFDV)
Frame loss measurements:
Average measured in one way frame loss ratio forward direction
Total frames sent and received in forward direction
Average measured in one way frame loss ratio reverse direction
Total frames sent and received in reverse direction
Ethernet Functions
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