TRENDnet TEW-738APBO User Manual page 38

TRENDnet User's Guide
will start to "Resend" packet before ACK is received, and throughputs become low
due to excessively high re-transmission. ACK Timeout is best determined by
distance between the radios, data rate of average environment. The Timeout value
is calculated based on round-trip time of packet with a little tolerance, So, if
experiencing re-transmissions or poor performance the ACK Timeout could be
made longer to accommodate.
Beacon Interval:: Beacon Interval is in the range of 20~1024 and set in unit of
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millisecond. The default value is 100 msec.
Access Point (AP) in IEEE 802.11 will send out a special approximated 50-byte
frame, called "Beacon". Beacon is broadcast to all the stations, provides the basic
information of AP such as SSID, channel, encryption keys, signal strength, time
stamp, support data rate.
All the radio stations received beacon recognizes the existence of such AP, and may
proceed next actions if the information from AP matches the requirement. Beacon
is sent on a periodic basis, the time interval can be adjusted.
By increasing the beacon interval, you can reduce the number of beacons and
associated overhead, but that will likely delay the association and roaming process
because stations scanning for available access points may miss the beacons. You
can decrease the beacon interval, which increases the rate of beacons. This will
make the association and roaming process very responsive; however, the network
will incur additional overhead and throughput will go down.
DTIM Interval: The DTIM interval is in the range of 1~255. The default is 1.
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DTIM is defined as Delivery Traffic Indication Message. It is used to notify the
wireless stations, which support power saving mode, when to wake up to receive
multicast frame. DTIM is necessary and critical in wireless environment as a
mechanism to fulfill power-saving synchronization. A DTIM interval is a count of the
number of beacon frames that must occur before the access point sends the
buffered multicast frames. For instance, if DTIM Interval is set to 3, then the Wi-Fi
clients will expect to receive a multicast frame after receiving three Beacon frame.
The higher DTIM interval will help power saving and possibly decrease wireless
throughput in multicast applications.
RTS Threshold: TRTS Threshold is in the range of 1~2347 byte. The default is 2347
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byte. The main purpose of enabling RTS by changing RTS threshold is to reduce
possible collisions due to hidden wireless clients. RTS in AP will be enabled
automatically if the packet size is larger than the Threshold value. By default, RTS is
disabled in a normal environment supports non-jumbo frames.
• Short Preamble: By default, it's "Enable". To Disable is to use Long 128-bit Preamble
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Synchronization field. The preamble is used to signal "here is a train of data coming"
to the receiver. The short preamble provides 72-bit Synchronization field to improve
WLAN transmission efficiency with less overhead.
WMM: By default, it's "Enabled".
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• Signal LED Threshold:
LED1: Set the RSSI reading when LED1 will activate.
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LED2: Set the RSSI reading when LED2 will activate.
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LED3: Set the RSSI reading when LED3 will activate.
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Change these settings as described here and click Save button to save your changes.
Click Reboot button to activate your changes.
TEW-738APBO
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