Frame Delay This critical parameter can have an impact on real-time applications
such as VoIP and is defined as the maximum delay measured for a percentile of successfully
delivered CIR-conformant (green) service frames over a time interval.
The frame delay parameter is used in the CoS service attribute described shortly.
Frame Jitter This service attribute is also known as delay variation and is also
critical in real-time applications such as VoIP or IP video. Such applications require a
low and bounded delay variation to function seamlessly.
Frame Loss Frame loss is defined as the percentage of CIR-conformant (green) fames
not delivered between UNIs over a measured interval. At this point, frame loss has
been defined for only Point-to-Point EVCs.
NOTE The impact of frame loss depends on specific higher-layer applications. Usually
such applications have the ability to recover from frame loss.
Class of Service (CoS) Class of Service (CoS) refers to the performance enforced on
a set of similar services. A CoS can be associated with each of the Ethernet services
offered but it is usually associated with a group of services. This association becomes
especially useful when there are numerous services offered over a resource (e.
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