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Statistic:
Use
AS
or
z
to select the type of port statistics to
view. Traffic is the other type of statistic option you can view (see
page 31).
Update interval:
Use
AS
or
z
to select the time period
between updates. For example, an update interval of 5 sec. means the
Console Manager collects and displays information from the
Management Module every five seconds.
Speed:
Displays the current speed of the hub in the Hub: field.
Type: Displays the manufacturer-assigned type of hub. You can
change this to whatever you want through the System Configuration
screen (see page 17).
Collisions:
The number of collisions detected. Collisions are
normal in an Ethernet network. They tend to rise as network
utilization rises.
Frames:
The number of frames detected without errors. Includes
unicast, broadcast, and multicast frames. Does not include frames
received with frames too long, runt, FCS, or alignment errors.
Octets:
The number of octets (bytes) contained in frames received
that had no errors. This includes octets in unicast, broadcast, and
multicast frames. It also includes octets after the start frame delimiter
up to FCS but not including FCS octets.
FCS errors:
The number of frames detected that are free of partial
octets and do not pass the FCS check. Usually caused by adapter
underrun (when the adapter can’t get enough PCI bandwidth). FCS
errors do not necessarily indicate that data has been lost.
Alignment errors:
The number of frames detected that contain
partial octets and do not pass the FCS check.
Frames too long:
The number of frames detected that exceed the
maximum permitted frame size of 1518 octets.
Short events:
The number of fragments detected with
ActivityDuration less than ShortEventMaxTime (greater than 74 bit
times and less than 82 bit times). Usually indicates a network
topology problem, such as connecting two Express hubs running at
100 Mbps with UTP cable (instead of Intel Cascade Cables in a stack),
or using cables longer than 100 meters.
NOTE
Since frames vary in length,
it’s best to look at the octet
count to see how much traffic
is passing through the hubs.