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Heavy Duty Edge Switches Installation and User Guide(07/05)
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(Many other switches have their packet buffer storage space divided evenly across all ports,
resulting in a small, fixed number of packets to be stored per port. When the port buffer
fills up, dropped packets result.) This dynamic buffer allocation provides the capability for
the maximum resources of the Heavy-Duty LBHXXX Edge Switches unit to be applied to
all traffic loads, even when the traffic activity is unbalanced across the ports. Since the
traffic on an operating network is constantly varying in packet density per port and in
aggregate density, the Heavy-Duty LBHXXX Edge Switches are constantly adapting
internally to provide maximum network performance with the least dropped packets.
When the Switch detects that its free buffer queue space is low, the Switch sends
industry standard (full-duplex only) PAUSE packets out to the devices sending packets to
cause “flow control”. This tells the sending devices to temporarily stop sending traffic,
which allows a traffic catch-up to occur without dropping packets. Then, normal packet
buffering and processing resumes. This flow-control sequence occurs in a small fraction of
a second and is transparent to an observer.