GarrettCom 4K-Series - Manual (Page 16)

Magnum 4K8 Switches Installation and User Guide (10/04)
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Another feature implemented in Magnum 4K8 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 4K8 Switches 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.