D-Link DI-308 - Manual (Page 86)

DI-308 ISDN Remote Router
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Tx Error packets – The number of invalid packets transmitted by the router.
This hardware counter shows the sum of Collisions, Abort, and Underrun
packets.
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Tx Collision Packets – The number of packets sent out of the router that collided
on the line. Some collisions are inevitable due to the shared nature of Ethernet.
Excessive collisions show excessive utilization of the network.
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Tx Abort Packets – When the router transmits a packet and a collision occurs,
the router will wait a random period and try to retransmit the packet. If a collision
occurs 16 times in a row, the transmission will be aborted and be logged by this
counter. An aborted packet shows extremely heavy utilization of the network.
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Tx Underrun Packets – Runt packets. The number of packets transmitted by the
router that are less than the allowed 64 octets minimum length. Underrun packets
occur due to jam signals generated by collisions, backpressure, etc.
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Rx Packets – The number of valid packets received by the router.
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Rx Bytes – The total number of bytes contained in the valid packets received by
the router.
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Rx Unknown Packets – The number of packets received by the router that were
of an unsupported protocol.
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Rx Discard Packets – The number of packets dropped by the router.
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Rx Error Packets – The number of invalid packets received by the router. This
hardware counter shows the sum of CRC, FAE, Overrun, MPA, and DFR error
packets.
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Rx CRC Packets – The number of packets received that failed the CRC
checksum test.
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Rx FAE Packets – Frame Alignment Error. The number of packets received that
does not end on a byte boundary and the CRC does not match.
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Rx Overrun Packets – The number of packets received that exceed the 1518
octet maximum length imposed on Ethernet packets. Overrun packets are
generated by some proprietary software applications.
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Rx MPA Packets – Missed Packets. This is a count of packets intended for the
router, but at the time, the router could not receive the packet (usually due to the
temporary lack of receive buffers).
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Rx DFR Packets – Deferred Packets. This is a count of incidents where CRS
(carrier signal lost) and COL both occur at the same time. These two events
happen simultaneously as a result of jabber (produced by faulty networking
equipment, usually NICs).