User Manual User Manual

52 Rockwell Automation Publication 1783-UM001D-EN-P - January 2013
Chapter 3 Diagnostics
Table 6 lists Receive (Rx) counters.
Table 6 - Rx Counters
Counter Description
Rx Octets Total good octets received on selected port.
Rx Undersize Pkts Good packets that are under 64 octets long.
Rx Pause Pkts Pause packets received by this port.
Pkts64 Octets Data packets = 512 bits.
Pkts65to127 Octets Data packets = 520…1016 bits.
Pkts128to255 Octet Data packets = 1024…2040 bits.
Pkts256to511 Octet Data packets = 2048…4088 bits.
Pkts512to1023 Octet Data packets = 4096…8184 bits.
Pkts1024to1522 Octet Data packets = 8192…12,176 bits.
RxOversize Pkts Packets over 12,176 bits or 1523…1536 octets.
RxJabbers Pkts Packets longer than 1522 octets and have an error, usually
caused by a faulty device.
RxAlignment Errors Packets between 64 and 1522 octets and have an error.
RxFCS Errors Packets received (between 645 and 1522 octets) with FCS
(frame check sequence) not matching.
RXGoodPkts Octets received with no errors.
RXDrop Pkts Packets dropped due to lack of resources, such as
bandwidth or input buffer.
RxUnicast Pkts Unicast packet received (only one receiving host).
RxMulticast Pkts Multicast packets received (many receiving hosts).
RxBroadcast Pkts Received by all hosts on the network.
RxSAChanges Number of times the Source address of a good packet has
changed value.
A count greater than 1 indicates a repeater based
network.
RxFragments Packets received less than 64 octets.
RxExcessSizeDisc Packets received greater than 1536 octets and discarded
due to excessive length.
RxSymbolError Invalid data symbol detected.