Cabletron Systems Element Manager 2.1, User Manual, Page: 98 / 108

FDDI Management
5-12 Performance
Available statistics are:
Transmit Frames
The number of frames transmitted by the MAC associated with the SMT during
the chosen interval.
Receive Frames
The number of frames received by the MAC associated with the SMT during the
chosen interval.
Frame Errors
The number of error frames detected by the MAC associated with the SMT during
the chosen interval that had not been detected previously by other stations. Error
frames may include frames with an invalid Frame Check Sequence (FCS), with
data length errors, or with internal errors that prevent the MAC from transferring
the frame to the Logical Link Control (LLC) layer.
Lost Frames
The number of frames detected by the MAC associated with the SMT during the
chosen interval that have an unknown error, so their validity is in doubt. When
the MAC encounters a frame of this type, it increments the Lost Frame counter
and strips the remainder of the frame from the ring, replacing it with idle
symbols.
Ring Ops
The number of times the ring has entered the ÒRing OperationalÓ state from the
ÒRing Not OperationalÓ state during the selected interval. This counter updates
when the MAC informs Station Management (SMT) of a change in Ring
Operation status.
TIP
Additional FDDI performance-related statistics are available via the FDDI Statistics
option on the Chassis View Device menu; see Chapter 2 for more information.