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Design Features 3
KNExTX/WG User’s Guide - Rev. A00 Kingston Technology Company
Design Features
The EtheRx hub complies with the full set of repeater basic functions as
defined by IEEE 802.3u. These functions include all Repeater Functions,
Signal Regeneration, Receive Jabber Protection, Collision-Handling, Error-
Handling, and Auto Partitioning/Reconnection.
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 802.3u specification in
terms of preamble structure, voltage amplitude, and timing characteristics.
These timing regenerations prevent cumulative signal loss, jitters, and
distortion caused by network cabling, thus allowing the EtheRx hubs to be
cascaded to other 100BASE-TX Class
II
repeaters.
Receive Jabber Protection
The EtheRx hub provides a Receive Jabber Protection scheme to ensure that
the network is not disabled due to reception of excessively long data packets.
This protection scheme will automatically interrupt the receiver if the EtheRx
hub has been continuously receiving for more than 65,536-bit times.
Collision-Handling
The EtheRx hub will detect and respond to collision conditions as outlined in
the IEEE 802.3u specifications.
Error-Handling
The 100BASE-TX standard uses an improved method of error-handling called
block coding . With 100BASE-TX Fast Ethernet, the new error-handling
feature prevents substandard links from generating streams of false carrier and
interfering with other links.
Automatic Port Partitioning/Reconnection
If any of the ports on the EtheRx hub experience excessive collisions, or faulty
conditions, that particular port can be partitioned. Once partitioned, the hub
will continue to monitor that port. If the error conditions have been corrected
or a good data packet is received without a collision, the hub will automatically
reconnect that port to the network.