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Heavy Duty Edge Switches Installation and User Guide(07/05)
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length and have the correct CRC, i.e. they are good packets. This eliminates propagation of
bad packets, enabling all of the available bandwidth to be used for valid information.
While other switching technologies such as "cut-through" or "express" impose
minimal frame latency, they will also permit bad frames to propagate to the Ethernet
network. The "cut-through" technique permits collision fragment frames, which are a result
of late collisions, to be forwarded--which add to the network traffic. There is no way to
filter frames with a bad CRC (the entire frame must be present in order for CRC to be
calculated). Since collisions and bad packets are more likely when traffic is heavy, store-
and-forward switch technology enables more bandwidth to be available for good packets
when the traffic load is greatest.
To minimize the possibility of dropping frames on congested ports, each Heavy-
Duty LBHXXX Edge Switch dynamically allocates buffer space from 128KB memory
pool, ensuring that heavily used ports receive very large buffer space for packet storage.