Performance Monitoring Functions - Alcatel-Lucent 7750 SR Manual

Ethernet Connectivity Fault Management (ETH-CFM)

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.
•
•
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.
Page 114
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.
7750 SR OS Services Guide