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4 Design Features
Kingston Technology Company EtheRx User’s Guide - Rev. B00
Design Features
The EtheRx hub complies with the full set of repeater basic functions as
defined by IEEE 802.3, Section 9. 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 hub implements a built-in MAU jabber lockup protection (MJLP)
scheme to ensure that the network is not disabled due to transmission of
excessively long data packets. This protection scheme will automatically
interrupt excessively long transmissions 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 hub will detect and respond to collision conditions as outlined in
the IEEE 802.3 specifications.