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CRC error
Number of packets received that contained checksum errors and as
a result were discarded.
Alignment (byte length)
Number of packets received that were not an even multiple of 8 bits
in length and as a result were discarded.
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.
too long (> nnnn bytes)
Number of packets received that were greater than the configured
frame size and as a result were discarded.
DMA/FIFO overrun
The number of times the serial interface card could not send data
fast enough to the system packet buffer memory to receive packets
from the network.
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.
aborted frame
Number of packets received that were aborted by the sender or a
line error.
Output frame counters:
DMA/FIFO underrun errors
Number of times the serial interface card could not retrieve data
fast enough from the system packet buffer memory to transmit
packets onto the network.
Output aborts sent
Number of transmissions that were aborted as requested by
upper-level software.
V.25bis Operating Commands
594
MRS V3.2 Software User’s Guide