Figure 12-7: Edit 802.11B/G/N Settings - Global Page - ADTRAN BlueSecure Controller Setup And Administration Manual

Advanced Mark the Display Advanced Settings checkbox to specify the following:
Settings for the
• Beacon Interval -- Enter the rate in milliseconds at which beacon signals are
802.11b/g/n
transmitted from the BSAP.
Radio
The beacon signals allow wireless clients to maintain contact with the BSAP. They
may also carry power-management information. (Default: 200 milliseconds)
• Fragmentation Threshold -- Enter the maximum length (in bytes) of the frame, beyond
which payload must be broken up (fragmented) into two or more frames. (Range:
256-2346 bytes, Default: 2346 bytes)
Collisions occur more often for long frames because sending them occupies the
channel for a longer period of time, increasing the chance that another station will
transmit and cause collision. Reducing Fragmentation Threshold results in shorter
frames that "busy" the channel for shorter periods, reducing packet error rate and
resulting retransmissions. However, shorter frames also increase overhead,
degrading maximum possible throughput, so adjusting this parameter means striking
a good balance between error rate and throughput.
• RTS Threshold -- Set the packet size threshold at which a Request to Send (RTS) signal
must be sent to a receiving station prior to the sending station starting
communications. (Range: 256-2346 bytes: Default: 2346 bytes)
The BSAP sends RTS frames to a receiving station to negotiate the sending of data.
After receiving an RTS frame, the station sends a CTS (clear to send) frame to notify
the sending station that it can start sending data.
If the RTS threshold is set to 0, the BSAP never sends RTS signals. If set to 2347, the
BSAP always sends RTS signals. If set to any other value, and the packet size equals
or exceeds the RTS threshold, the RTS/CTS (Request to Send /Clear to Send)
mechanism will be enabled.
The BSAPs contending for the medium may not be aware of each other. The RTS/CTS
mechanism can solve this "Hidden Node Problem."
• DTIM -- Enter the number of beacon internals at which stations in sleep mode must
wake up to receive broadcast/multicast transmissions. (Range: 1-255 beacons;
Default: 1 beacon)
Delivery Traffic Indication Map (DTIM) interval, it indicates how often the MAC layer
forwards broadcast/multicast traffic, which is necessary to wake up stations that are
using Power Save mode. The default value of 2 indicates that the BSAP will save all
broadcast/multicast frames for the Basic Service Set (BSS) and forward them after
every second beacon.
Using smaller DTIM intervals delivers broadcast/multicast frames in a more timely
manner, causing stations in Power Save mode to wake up more often and drain
power faster. Using higher DTIM values reduces the power used by stations in Power
Save mode, but delays the transmission of broadcast/multicast frames.
Antenna Specify the Antenna Type by marking the appropriate radio button (BSAP-15x0
1.
Options platforms only):
• Internal - The BSAP uses its fixed omni antennas for communications.
• External - The BSAP uses connected external antennas for communications. External
antennas are available only for model BSAP-1540s. A BSAP-1500 will always use its
fixed antennas for communications regardless of the configured antenna type.
Selecting External disables antenna diversity controls, since only antenna B is used.
BlueSecure™ Controller Setup and Administration Guide

Figure 12-7: Edit 802.11b/g/n Settings - Global Page

Configuring Global Radio Settings
12-13