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Line speed
Configured line speed or default value assumed (if line speed is configured
as 0).
Last port reset
Length of time since the port was reset.
CRC error
The number of packets received that contained checksum errors and as a
result were discarded.
Alignment (byte length)
The number of packets received that were not an even multiple of 8 bits in
length and as a result were discarded.
Too long (> 2048 bytes)
The number of packets that were greater than the configured frame size,
and as a result were discarded.
Aborted frame
The number of packets received that were aborted by the sender or a line
error.
DMA/FIFO overrun
The number of times the serial interface could not send data fast enough to
the system packet buffer memory to receive them from the network.
Missed frame
When a frame arrives at the device and there is no buffer available, the
hardware drops the frame and increments the missed frame counter.
L & F bits not set
On serial interfaces, the hardware sets input-descriptor information for
arriving frames. If the buffer can accept the complete frame upon arrival,
the hardware sets both the last and first bits of the frame, indicating that the
buffer accepted the complete frame. If either of the bits is not set, the
packet is dropped, the L & F bits not set counter is incremented, and the
buffer is cleared for reuse.
Note: It is unlikely that the L & F bits not set counter will be affected by
traffic.
Output Frame Counters:
DMA/FIFO underrun errors
The number of times the serial interface could not retrieve data fast enough
from the system packet buffer memory to transmit them onto the network.
Output aborts sent
The number of transmissions that were aborted as requested by upper-level
software.
Monitoring PPP Interfaces (Talk 5)
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MRS V3.2 Software User’s Guide