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Magnum DS50 / DS60s Dual Speed Hubs Installation and User Guide (06/02)
processing resumes. This flow-control sequence occurs in a small fraction of a second and is
transparent to an observer. See Section 4.6 for additional details.
Another feature implemented in Magnum DS60’sSwitched port 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 DS60’s Switched port varies with the port-speed types, and
the length of the frame is a variable here as it is with all store-and-forward switches. For 10
Mb-to-10 Mb or 10 Mb-to-100Mb or 100Mb-to-10 Mb forwarding, the latency is 15
microseconds plus the packet time at 10 Mb. For 100Mb-to-100Mb forwarding, the latency is
5 microseconds plus the packet time at 100Mb.
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