Enterprise LANMeter
Setting Up Your Instrument
21
LED Indicators
The instrument LEDs include both status (individual) and bargraph LEDs that
indicate important network conditions. Figure 4 shows the status and bargraph
LEDs. You can use these LED indicators for quick problem isolation. The
Fluke 686 and 685 individual LEDs have two sets of labels, one for Ethernet
(the top label) and one for Token Ring (the bottom label). The instrument also
has two individual LEDs to indicate which network connector to use, what
Ethernet speed (686 and 683 only), and one LED to indicate battery charger
status. The following sections describe the meaning of these LEDs:
r Utilization Percentage Bargraph
r Frame Error/Beacon
r Collision/Ring Error
r Polarity/Wire Fault
r Link Active/Insert
r Transmit/16 Mb/s
r BNC/4 Mb/s
r HUB/MAU
r NIC
r Battery Charger Status
Utilization Percentage Bargraph
Utilization Percentage bargraph LEDs show the instantaneous network
utilization percentage. Each LED represents 10% utilization on the network up
to a total of 100% utilization when all 10 LEDs are lit. The more LEDs that
the instrument lights, the higher the network utilization.
When the instrument first inserts into a ring, the utilization LED’s will briefly
light while the instrument performs its Lobe Test.
Frame Error/Beacon
The red FRAME ERROR LED is on when the instrument detects a jabber
frame (a frame with greater than 1518 bytes), a short frame (one with less than
64 bytes), or a frame with a bad frame check sequence.
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