Amer Networks WAP43DC Fat Web - Manual (Page 21)

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WAP43DC FAT Web Manual Chapter 4 Advance Configuration
Short Guard
Interval
Supported
This field is available only if the selected radio mode includes 802.11n.
The guard interval is the dead time, in nanoseconds, between OFDM
symbols. The guard interval prevents Inter-Symbol and Inter-Carrier
Interference (ISI, ICI). The 802.11n mode allows for a reduction in this
guard interval from the a and g definition of 800 nanoseconds to 400
nanoseconds. Reducing the guard interval can yield a 10% improvement
in data throughput.
Select one of the following options:
Yes-The AP transmits data using a 400 ns guard Interval when
communicating with clients that also support the short guard interval.
No-The AP transmits data using an 800 ns guard interval.
STBC Mode This field is available only if the selected radio mode includes 802.11n.
Space Time Block Coding (STBC) is an 802.11n technique intended to
improve the reliability of data transmissions. The data stream is
transmitted on multiple antennas so the receiving system has a better
chance of detecting at least one of the data streams.
Select one of the following options:
On-The AP transmits the same data stream on multiple antennas at the
same time.
Off-The AP does not transmit the same data on multiple antennas.
Protection The protection feature contains rules to guarantee that 802.11
transmissions do not cause interference with legacy stations or
applications. By default, these protection mechanisms are enabled
(Auto). With protection enabled, protection mechanisms will be invoked if
legacy devices are within range of the AP.
You can disable (Off) these protection mechanisms; however, when
protection is off, legacy clients or APs within range can be affected by
802.11n transmissions. Protection is also available when the mode is
802.11b/g. When protection is enabled in this mode, it protects 802.11b
clients and APs from 802.11g transmissions.
Note: This setting does not affect the ability of the client to associate with
the AP.
Beacon
Interval Beacon frames are transmitted by an AP at regular intervals to
announce the existence of the wireless network. The default behavior is
to send a beacon frame once every 100 milliseconds (or 10 per second).
Enter a value from 40 to 2000 milliseconds.
DTIM Period Specify a DTIM period from 1 to 255 beacons.
The Delivery Traffic Information Map (DTIM) message is an element
included in some Beacon frames. It indicates which client stations,
currently sleeping in low-power mode, have data buffered on the AP
awaiting pick-up.
The DTIM period you specify indicates how often the clients served by
this AP should check for buffered data still on the AP awaiting pickup.
The measurement is in beacons. For example, if you set this field to 1,
clients will check for buffered data on the AP at every beacon. If you set
this field to 10, clients will check on every 10th beacon.
Fragmentation
Threshold
Specify a number between 256 and 2,346 to set the frame size in bytes.
The fragmentation threshold is a way of limiting the size of packets
(frames) transmitted over the network. If a packet exceeds the
fragmentation threshold you set, the fragmentation function is activated
and the packet is sent as multiple 802.11 frames.
If the packet being transmitted is equal to or less than the threshold,
fragmentation is not used.
Setting the threshold to the largest value (2,346 bytes) effectively
disables fragmentation. Fragmentation plays no role when Aggregation
is enabled.