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Heavy Duty Edge Switches Installation and User Guide(07/05)
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Another feature implemented in Heavy-Duty LBHXXX Edge Switches is a collision-based
flow-control mechanism (when operating at half-duplex only). When the Switch detects
that its free buffer queue space is low, the Switch prevents more frames from entering by
forcing a collision signal on all receiving half-duplex ports in order to stop incoming traffic.
The latency (the time the frame spends in the Switch before it is sent along or
forwarded to its destination) of the Heavy-Duty LBHXXX Edge Switches varies with the
port-speed types. The length of the frame is a variable as it is with all store-and-forward
switches. For 10 Mb-to-10 Mb, 10 Mb-to-100Mb or 100Mb-to-10 Mb forwarding, the
latency is 15 microseconds plus the packet time of 10 Mb. For 100Mb-to-100Mb
forwarding, the latency is 5 microseconds plus the packet time of 100Mb.