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CSG14 Series Gigabit Converter Switch Installation and User Guide (12/08)
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Magnum CSG14 Series Converter Switch dynamically allocates buffer space from 64Kb
memory pool, ensuring that heavily used ports receive very large buffer space for packet
storage. (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 Magnum CSG14 Series 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 Magnum CSG14 Series Converter 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. See Section 4.6 for additional details.