72 Rockwell Automation Publication 1788-UM059B-EN-P - September 2015
Chapter 7 Diagnostic Web Pages
Media Counters Port 1/Port 2
Ring Statistics
This section contains information about the topology of the network, and
specific ring information.
Diagnostic Web Pages—
Miscellaneous
The following sections explain the miscellaneous sections of the diagnostic web
pages.
Crash Display
This is the hexadecimal dump of the current fatal event log, that is stored in the
linking device. If no crash has ever occurred, the contents are all zero.
Heap Statistics
This information is only for support issues.
Field Description
Alignment Errors A frame containing bits that do not total an integral multiple of eight.
FCS Errors A frame containing eight bits, at least one of which has been corrupted.
Single Collisions The number of outgoing packets that encountered only one collision during
transmission.
Multiple Collisions The number of outgoing packets that encountered 2...15 collisions during
transmission.
Excessive Collisions The number of frames that experience 16 consecutive collisions.
MAC Transmit Errors Frames for which transmission fails due to an internal MAC sublayer transmit error.
Frame Too Long The number of incoming packets that exceed the maximum Ethernet packet size.
MAC Receive Errors Frames for which reception on the Ethernet interface failed due to an internal MAC
sublayer receive error.
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