Black Box 5000 series Reference Manual page 215

CRC Cyclic Redundancy Check — This often indicates a problem with the transmitting hardware
and/or communications line (a modem, noisy line, router link problem) that has been detected by
the receiver.
Rcv abort Receiver Abort — This reports that an incoming frame has been aborted. This results when the
transmitter doesn't receive all of a frame to be sent, and it sets an abort flag at the point this is
discovered in the transmission. The receiver notes this as a statistic and discards the frame.
Overrun The link controller could not empty the link FIFO into common memory before the next frame
from the link is written to the FIFO. This indicates a problem with the memory inside the router.
Rcv miss Receiver Miss — This reports that an incoming frame has been aborted. This results when the
frame is missed because of a lack of receive buffers. The remote router will retransmit the frame.
Too large This reports that an incoming frame has been discarded because the frame exceeded the maximum
length. This may be caused by a frame being overrun by another frame on the link, so that the
router thinks both frames are one frame.
Misaligned This reports that frames detected on this link have a number of bits not exactly divisible by eight.
Underrun The link controller could not read the rest of the frame from common memory before the link
FIFO emptied. This indicates a problem with the memory inside the router.
Throughput
Both receive and transmit call utilization are displayed by the two bar graphs. Utilization describes the total bits
received or sent (including protocol overhead) divided by the total bits possible based on the call speed. For each
statistic, the numerical percentage is printed along with its equivalent baud rate and the bar graph.
Rcv 25% 14.0KB
Xmt 50% 28.0KB
Menus Reference Manual: Statistics Menu
Throughput
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0 10 20 30 40 50 60 70
215
80 90 100%