4-18 Motorola RF Switch System Reference Guide
3. Click the Details button to view packet level statistics of any user-defined interface. For more
information, see Viewing Virtual Interface Statistics on page 4-18.
4. Click the Graph button to view a graphical representation of the switch virtual interface statistics. For
more information, see Viewing the Virtual Interface Statistics Graph on page 4-20.
4.4.2.1 Viewing Virtual Interface Statistics
To view detailed virtual interface statistics:
1. Select a virtual interface from the Statistics tab.
2. Click the Details button.
Packets In Error Displays the number of error packets coming into the interface.
• Runt frames — Packets shorter than the minimum Ethernet frame length (64
bytes).
• CRC errors — The Cyclical Redundancy Check (CRC) is the 4 byte field at the
end of every frame. The receiving station uses to interpret if the frame is valid.
If the CRC value computed by the interface does not match the value at the end
of frame, it is considered as a CRC error.
• Late collisions — A late collision is any collision that occurs after the first 64
octets of data have been sent by the sending station. Late collisions are not
normal and are usually the result of out of specification cabling or a
malfunctioning device.
• Misaligned frames — A misaligned frame is a frame that somehow gets out of
sync with the receiving station’s receive clock recovery circuit. Misalignment is
reported if the frame ends with a CRC error and extra bits are also detected.
Bytes Out Displays the number of bytes going out on the interface.
Packets Out Displays the number of packets going out on the interface.
Packets Out Dropped Displays the number of dropped packets going out of the interface due to
saturated output queues assigned to the interface processor or the physical
device/software module. Packets can be dropped due to collisions as well.
Packets Out Error Displays the number of error packets going out of the interface including frame
forming errors or malformed packets transmitted over the interface.
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