Wireless Wmm Qos Setup - TRENDnet TEW-738APBO User Manual

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Quick installation manual (16 pages)

Table Of Contents

Table of Contents

TRENDnet User's Guide

performance of long distance radio link. If ACK Timeout is set too short, transmitter

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.

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WMM: By default, it's "Enabled".