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Design Features 5
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
Design Features
The Fast EtheRx 100BASE-TX hubs comply with the full set of repeater
functions as defined by IEEE 802.3u, clause 27. These functions include all
Repeater Functions, Signal Regeneration, Jabber Lockup Protection, Collision-
Handling, Error-Handling, and Auto Partitioning/Reconnection. These
functions are usually transparent to all network activities and are summarized
below.
Repeater Functions
If any single port senses the start of a valid packet on its receiving line, the Fast
EtheRx hub will re-transmit the received data to all other ports on the network.
The retransmission of packets complies with the IEEE 802.3u specification in
terms of preamble structure, voltage amplitude, and timing characteristics.
These timing regeneration’s prevent cumulative signal loss, jitter, and
distortion caused by the network cabling, and allow the Fast EtheRx Hubs to be
uplinked to another 100BASE-TX switching hub or cascaded to other Class
II
Repeater.
Jabber Lock-up Protection
The Fast EtheRx hubs implement a built-in jabber protection scheme to ensure
that the network is not disabled due to transmission of excessively long data
packets. This protection scheme will automatically interrupt the reception of
abnormally long streams of data to prevent jabber lock-up.
Collision-Handling
The Fast EtheRx hubs will perform collision detection and respond to collision
conditions as defined in the IEEE 802.3u specifications.
Error-Handling
With 100BASE-TX Fast Ethernet, the new error-handling feature prevents sub-
standard links from generating streams of false carrier and interfering with
other links.