User Guide

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TRENDnet User’s Guide
TEW-740APBO
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 DTIM Interval: The DTIM interval is in the range of 1~255. The default is 1.
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
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 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”.
Wireless WMM QoS Setup
To achieve optimal wireless performance, it is necessary to tweak advance setting per
requirements properly, not necessary higher the better or lower.
The administrator can change the RTS threshold and fragmentation threshold settings
for the system. Please click on Wireless -> Advanced
 WMM Parameters of Access Point : This affects traffic flowing from the access
point to the client station
Queue
Data
Transmitted
AP to Clients
Priority
Description
AC_BK
Background.
Low
High throughput. Bulk data that requires maximum
throughput and is not time-sensitive is sent to this
queue (FTP data, for example).
AC_BE
Best Effort
Medium
Medium throughput and delay. Most traditional IP
data is sent to this queue
AC_VI
Video
High
Minimum delay. Time-sensitive video data is
automatically sent to this queue
AC_VO
Voice
High
Time-sensitive data like VoIP and streaming media
are automatically sent to this queue
Configuring QoS options consists of setting parameters on existing queues for different
types of wireless traffic. You can configure different minimum and maximum wait
times for the transmission of packets in each queue based on the requirements of the
media being sent. Queues automatically provide minimum transmission delay for
Voice, Video, multimedia, and mission critical applications, and rely on best-effort