Ethernet Connectivity Fault Management (ETH-CFM)
Page 114 7750 SR OS Services Guide
Performance Monitoring Functions
OAM functions for performance monitoring allow measurement of different performance
parameters where such measurements are carried out for error performance. The performance
parameters are defined for point-to-point ETH connections. Performance parameters and functions
for multipoint ETH connectivity are for further study.
The recommendation covers the following performance parameters, which are based on MEF 10.
• Frame delay — Specified as one-way or round-trip delay for a frame, where frame delay is
defined as the time elapsed since the start of transmission of the first bit of the frame by a
source node until the reception of the frame by the destination node or the same source
node.
• Frame delay variation — A measure of the variations in the frame delay between a pair of
service frames, where the service frames belong to the same CoS instance on a point-to-
point ETH connection.
Performance parameters are applicable to services frames. Services frames are those frames that
conform to an agreed-upon level of bandwidth profile conformance and are associated with a
particular CoS identifier. Service frames are admitted at the ingress ETH flow point of a point-to-
point ETH connection and should be delivered to the egress ETH flow point. Specification of
bandwidth profile conformance is outside the scope of this recommendation.
One-way and two-way ETH-DM (section 8.2 of Y.1731) must be supported
For ETH-DM, the accuracy of the measurement will be in nanoseconds range, +1 or -1 ms in the
best case.
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