User manual

Publication ENET-UM001I-EN-P - January 2010 155
Troubleshoot an EtherNet/IP Module Chapter 11
To troubleshoot intermittent Ethernet connectivity, perform this procedure.
1. Click the Ethernet Statistics tab.
T
he Ethernet Statistics diagnostic web page appears.
MAC Receive
Errors
The number of frames for which reception via a particular interface fails due to an internal MAC sublayer
transmission error.
Important: MAC receive errors are only counted if either the frame
too long count, alignment errors, or FCS errors
are not counted.
Carrier Sense
Errors
Carrier sense errors
fall into these categories:
• No Carrier Sense Present - The num
ber of times the carrier is not present when a transmission starts.
• Carrier Sense Lost -
The number of times the carrier is lost during a transmission.
Carrier sense errors usually indicate a problem with a cable on the Ethernet infrastructure.
Frame Too Long The number of incoming packets that exceed the maximum Ethernet packet size.
Ethernet Media Counters
Medi
a Counter Definition