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Chapter 6: Operation
Figure 6-30. Signal levels of real live data
from a 100-Mbps switch.
The signal level screen is one the most powerful tools used
during Level 2 verification. It is a live signal attenuation display.
If the level is below the DATA MIN line, you may experience
faulty transmissions. If the signal is well above the DATA MIN
line, you have plenty of "headroom". Press the down arrow key
q
to continue.
The two examples above show the differences between Gigabit
devices and 10-and 100-Mbps devices. With a Gigabit device it
is possible to view real live data on all four pairs whereas a
10- and 100-Mbps device can only transmit on one pair. A
Gigabit device is a full duplex device that uses all four pairs,
therefore making it a perfect device to get a full view of all four
pairs of the cable.
The following screen only appears if Verification Level 2 was
performed:
Figure 6-31. LAN Performance Verification Level 2
summary screen.
