Netscout OneTouch AT G2, Руководство пользователя

Страница: 243 / 396

Chapter 8: Wi-Fi Analysis
Channel Analysis
227

Channel frequency

Channel number

The utilization graph trends 802.11 utilization of the channel.
The graph shows 802.11 utilization in light blue as a
percentage of total bandwidth and non-802.11 utilization as
dark blue. The graph’s scale is 0% to 100%.

802.11 utilization values less than 40% are shown in a
green box.

Non-802.11 utilization values less than 20% are shown in
a green box.

802.11 utilization values greater than or equal to 40% are
shown in a yellow box, indicating potentially excessive
utilization.

Non-802.11 utilization values greater than or equal to
20% are shown in a yellow box, indicating potentially
excessive interference.

The Retries graph gives you an indication of network coverage,
congestion, and capacity problems.

The Signal and Noise graph shows the power level of 802.11
signals and of noise.
The upper (light blue) line on this graph shows signal strength
on a scale of 0 to -100 dBm. The displayed value is for the stron-
gest received signal from an AP that is utilizing the channel.

Signal values greater than -75 dBm are shown in a green
box, indicating a strong signal.

Signal values less than or equal to -75 dBm are shown in a
yellow box, indicating a marginal or weak signal.
The lower (dark blue) line on the graph shows noise.

Noise values less than or equal to -80 dBm are shown in a
green box, indicating a low noise level.

Noise values greater than -80 dBm are shown in a yellow
box, indicating a noisy environment.