EMM-E6 Ethernet User's Guide

CHAPTER 11: DEVICE STATISTICS SCREEN
11-2 EMM-E6 User’s Guide
11.1 DEVICE STATISTICS
This section describes Device Statistics screen data fields.
BYTES RECEIVED
Displays the number of bytes received.
FRAMES RECEIVED
Displays the number of frames received.
FRAMES FILTERED
Displays the total number of frames filtered.
FRAMES TRANSMITTED
Displays the total number of frames transmitted.
ERRORS RECEIVED
Displays the total number of errors received.
COLLISIONS
Displays the number of collisions received.
OOW COLLISIONS
Displays the number of Out Of Window collisions. OOW collisions
are usually caused by: The network being so long that the round trip
propagation delay is greater than 51.2 µs (the collision domain is too
large); a station somewhere on the network violating Carrier Sense
and transmitting at will; or a cable somewhere on the network failing
during the transmission of a packet.
CRC ERRORS
Displays the number of packets with bad Cyclic Redundancy Checks
(CRC) that have been received from the network. The CRC is a 4 byte
field in the data packet that ensures that the transmitted data that is
received is the same as the data that was originally sent.
ALIGNMENT ERRORS
Displays the number of errors due to misaligned packets. Misaligned
packets contain a non-integral number of bytes (i.e., some bytes
contain fewer than 8 bits).
CH1Book Page 2 Wednesday, March 20, 1996 7:48 AM