Hardware Reference
In-Depth Information
Standard —he IEEE 802.11 wireless standards have a variety of diferent types, dis-
tinguished by a letter suix. his section lists the standards supported by the USB
wireless adapter. For the example adapter, this reads IEEE 802.11bgn for the net-
work types it can address.
ESSID —he SSID of the network to which the adapter is connected. If the adapter is
not currently connected to a network, this will read off/any .
Mode —he mode that the adapter is currently operating in, which will be one of the
following:
Managed —A standard wireless network, with clients connecting to access
points. his is the mode used for almost all home and business networks.
Ad-Hoc —A device-to-device wireless network, with no access points.
Monitor —A special mode in which the card listens out for all traic whether or
not it is the addressee. his mode is typically used in network troubleshooting for
capturing wireless network traic.
Repeater —A special mode that forces a wireless card to forward traic on to
other network clients, to boost signal strength.
Secondary —A subset of the Repeater mode, which forces the wireless card to act
as a backup repeater.
Access Point —he address of the access point to which the wireless adapter is cur-
rently connected. If the adapter isn't connected to a wireless access point, this will read
Not-Associated .
Tx-Power— he transmission power of the wireless adapter. he number displayed
here indicates the strength of the signal that the adapter is sending: the higher the
number, the stronger the signal.
Retry— he current setting for the wireless adapter's transmission retry, used on con-
gested networks. his does not normally need changing, and some cards won't allow it
to be changed.
RTS —he adapter's current setting for Ready To Send and Clear To Send (RTS/CTS)
handshaking, used on busy networks to prevent collisions. his is normally set by the
access point on connection.
Fragment —he maximum fragment size, used on busy networks to split packets up
into multiple fragments. his is normally set by the access point on connection.
Power Management —he current status of the adapter's power management function-
ality, which reduces the device's power demands when the wireless network is idle. his has
little efect on the Pi, but is typically enabled for battery-powered devices like a laptop.
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