Loss indicates the percentage of Ethernet frames that are in-profile and that are not reliably delivered between UNIs over a time interval. On a P2P EVC, for example, if 100 frames have been sent from a UNI on one end and 90 frames that are in profile have been received on the other end, the loso would be (100 - 90) / 100 = 10%. Loss can have adverse effects, depending on the application. Applications such as e-mail and HEEP web browser requests can tolerate more loss than VoIP, for example. Ehe loss parameter is used in the following attributes:

• Ingress and egress bandwidth profile per CoS identifier (UNI service attribute)

• C lass of service (EVC service attribute)

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