Stride Industrial Ethernet Switches User Manual 2nd Ed. Rev. B
Chapter 3 - Managed Switch Software Monitoring
• Deferred Transmissions = A deferred transmission occurs when the device detects a carrier signal (a
device is already transmitting).
• Late Collisions = In some situations, a collision is not detected until after the Ethernet device has
started transmitting the packet. This is called a Late Collision. A Late Collision is more specifically
defined as a collision that is detected 51.2 microseconds after the device has started sending on a
10BASE-T network and 5.12 microseconds on a 100BASE-T network. Late collisions are usually
caused by improper network configurations, compliance issues between devices, incorrect cabling
and/or fault Network Interface Cards.
• Excessive Collisions = As part of the CSMA/CD mechanism, an Ethernet device will attempt to
re-transmit a frame 16 times if a collision is detected. If the device is unsuccessful after 16 times, it
will give up and that frame will not be transmitted.
• Internal MAC Transmit Errors = This error occurs when frames fail to be transmitted correctly
due to an internal MAC sub-layer transmit error.
• Carrier Sense Errors = This error occurs when the carrier sense is lost during a transmission from
the Ethernet device. The error only increments once during the transmission even if the carrier
sense is lost and regained multiple times during that transmission.
• Frame Too Long = This error occurs when a frame is encountered that exceeds the maximum
frame size.
• Internal MAC Receive Errors = This error occurs when frames fail to be received correctly due to
an internal MAC sub-layer receive error.
• Symbol Errors = These errors occur when the device could not correctly decode a symbol that has
been received. This is usually indicative of bad cabling and/or electrical noise problems. A symbol
is a waveform change on the wire that may contain 1 or many bits of information.
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