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Design Features 3
KNE24TP/RS User’s Guide - Rev. A01 Kingston Technology Company
Design Features
The EtheRx Pro-Series hubs comply with the full set of repeater functions as
defined by IEEE802.3 CSMA/CD and IEEE 802.3i 10BASE-T Ethernet
standard. These functions include all Repeater Functions, Signal Regeneration,
Jabber Lockup Protection, Fragment Extension, Collision-Handling, Auto
Partitioning/Reconnection and Link Test. 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
EtheRx hub will re-transmit the received data to all other ports on the network.
The re-transmission of packets complies with the IEEE 802.3 specification in
terms of preamble structure, voltage amplitude, and timing characteristics.
These timing regenerations prevent cumulative signal loss, jitter, and distortion
caused by the network cabling, and allow the EtheRx hubs to be cascaded to
other Ethernet hubs.
Jabber Lock-up Protection
The 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.
Fragment Extension
If the total packet length received by the EtheRx hub is less than 96 bits,
including preamble, then the hub will automatically extend the repeated packet
length to 96 bits by appending a jam sequence to the original fragment. The
extension of a fragmented packet allows the reliable detection of a collision by
all stations attached to the network.
Collision-Handling
The EtheRx hubs will perform collision detection and respond to collision
conditions as defined in the IEEE 802.3 specifications.