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8-14 CHAPTER 8: ADMINISTERING FDDI RESOURCES

Table 8-4 Description of Fields for FDDI MAC Attributes (continued)

Field	Description

tvxCapab	Maximum time value of the valid transmission timer that this MAC
	can support
tvxExpiredCount	Number of times that this MAC’s valid transmission timer has
	expired
tvxValue	Value of the valid transmission timer in use by this MAC
txByteRate	Average number of bytes transmitted per second by this MAC
	during the most recent sampling period
txBytes	Number of bytes transmitted by this MAC, including framing
	characters
txDiscards	Number of frames discarded because LLC Service was not enabled
	or the FDDI ring was not operational
txFrameRate	Average number of frames transmitted per second by this MAC
	during the most recent sampling period
txFrames	Number of frames transmitted by this MAC. (Note that this
	number does not include MAC frames.)
txInternalErrs	Number of frames discarded because of an internal hardware
	error during transmission
txMulticasts	Number of multicast frames queued for transmission by a
	higher-level protocol or application, including frames not
	transmitted successfully
txPeakByteRate	Peak value of fddiMACByteTransmitRate for this MAC since the
	station was last initialized
txPeakFrameRate	Peak value of fddiMACFrameTransmitRate for this MAC since the
	station was last initialized
txQOverflows	Number of frames discarded because the transmit queue was full
txUnicasts	Number of unicast frames queued for transmission by a
	higher-level protocol or application, including frames not
	transmitted successfully
upstream	MAC address of this MAC’s upstream neighbor

Frame Processing and FDDI MAC Statistics

upstreamDupAddr Indicates whether the address upstream of this address is duplicated on the ring

All frames on the FDDI network are received promiscuously by an FDDI MAC. However, a frame might be discarded for the following reasons:

3Com 2200 manual There is no buffer space available Frame is in error