S14 & PS14P (PoE) Convenient Switches Installation and User Guide (01/06)
27
www GarrettCom com
.
.
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.
Another feature implemented in Magnum S14-Series & PS14P(PoE) Convenient
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 S14-Series & PS14P(PoE) Convenient Switches varies
with the port-speed types. 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.
