'Removes’ packets
Number of MAC
remove from the ring
frames received by the interface. On receiv-
ing these, the interface removes itself from the ring.
Line errors
Increases when a frame is repeated or copied, the Error Detected Indicator (EDI)
bit is 0 for the incoming frame and one of the following conditions is met:
a) A Token has a code violation.
b) A frame has a code violation between the start and end delimiters.
c) A Frame Check Sequence (FCS) error occurs.
ARI/FCI errors
The ARI/FCI (Address Recognized Indicator/Frame Copied Indicator) Errors
counter increases if the interface receives either of the following:
a) An Active Monitor Present (AMP) MAC frame with the ARI/FCI bits equal to 0
and a Standby Monitor Present (SMP) MAC frame with the ARI/FCI bits equal to
0.
b) More than one SMP MAC frame with the ARI/FCI bits equal to 0, without an in-
tervening AMP MAC frame.
This condition indicates the upstream neighbor (from where frames are received)
is unable to activate the ARI/FCI bits.
Frame copy errors
The interface, in
receive/copy
mode, recognizes a frame addressed to its specific
address but finds the Address Recognize Indicator (ARI) bits is not equal to 0.
This error indicates a possible line hit or duplicate address.
Lost frames
The interface is in
transmit
mode and fails to receive the end of a transmitted
frame.
'Burst' errors
The interface detects the absence of transitions for
five half-bits
times between the
start delimiter (SDEL) and the end delimiter (EDEL), or between the EDEL and the
SDEL.
Input drops
The interface, in
repeat
mode, recognizes a frame addressed to it but has no
available space to copy the frame.
'Token' errors
Increases when the active monitor detects a token protocol with any of the follow-
ing errors:
a) The token MONITOR_COUNT bit with nonzero priority equals one.
b) The frame MONITOR_COUNT bit equals one.
c) No token or frame is received within a 10ms window.
d) The starting delimiter/token sequence has a code violation in an area where
code violations cannot exist.
Too big frames
Number of received frames with a bigger data field than the one supported by the
interface.
Mac Code Version
Mac code version running in the Token Ring communications processor.
Teldat SA
2 Monitoring Token Ring Interfaces
LAN Interfaces
9
