OneTouch Series II
Users Manual
If the percentage of frames with a bad FCS is greater than 1%, then it should be considered a serious problem that is affecting network throughput.
A given rate of bad FCS frames has a much more serious effect on network throughput than a similar collision rate. This is because the retransmission time is so much longer. When a collision occurs, the frame is retransmitted within a few milliseconds because the sending station knows that there was a problem acquiring the media for transmission. Conversely, when a frame is corrupted (resulting in a bad FCS) the receiving station ignores the frame. The sending station does not know the frame was corrupted and therefore it is up to the upper protocol layer timeouts to cause a retransmission to occur. This process can take several seconds to retransmit a single frame.
Tracking Addresses
The Network Assistant tracks addresses by their
A station can appear in the station list more than once if it is configured to run more than one protocol or has more than one
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Figure 3-5. Station Addresses
Local vs. Remote Stations
The Network Assistant initially classifies the location of all stations as Unknown until it observes traffic that proves that the station is either remote or local.
A local station is one that is connected to the same Ethernet segment as the Network Assistant. In a switched
