Fast SwitcHub-2se User’s Guide
1-4 Introduction
on the current error rate. These switching alternatives start at standard cut-
through for a clean data environment, change to fragment-free cut-through for a
moderate error rate, and then progress to store-and-forward for a highly
contentious environment. By using this method, the Fast SwitcHub-2se
delivers the best networking performance under any environment.
Features of the Fast SwitcHub-2se
• Conforms to the IEEE 802.3 and IEEE 802.3u specifications, as well as
10BASE-T, 100BASE-TX and 100BASE-FX standards
• Provides one independent RJ-45 10BASE-T / 100BASE-TX Ethernet station
port, where each logical port consists of 1 MDI port (for connection to hubs
or switches) and 1 MDI-X port (for connection to workstations or servers),
eliminating the need for crossover cables
• Provides one independent 100BASE-FX port with Rx/Tx jacks
(SC or ST type connectors can be used, depending on the model you purchase)
• Both ports support full-duplex and half-duplex operation
• Total bandwidth of up to 200 Mbps (when full-duplex mode is used)
• RJ-45 port auto-senses transmission speed (10/100 Mbps)
• Uses adaptive cut-through switching (which dynamically changes among
standard cut-through, fragment free cut-through, and store-and-forward
depending on the error rate)
• Uses back pressure to eliminate frame loss by “blocking” traffic from end
stations or segments connected directly to the switch when its buffers fill
• Minimum latency of packet transmission (leading edge to leading edge) less
than 20 microseconds when using cut-through switching
• Uses “on the fly” cut-through technique to transport packets
