TRENDnet TEW-827DRU, Руководство пользователя

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TRENDnet User’s Guide
TEW-827DRU
28
Advanced Settings
Advanced > Wireless (2.4GHz or 5GHz) > Advanced
These settings are advanced options that can be configured to change advanced
wireless broadcast specifications. It is recommended that these settings remain set to
their default values unless you are knowledgeable about the effects of changing these
values. Changing these settings incorrectly can degrade performance.

Beacon Period: A beacon is a management frame used in wireless networks
that transmitted periodically to announce the presence and provide
information about the router’s wireless network. The interval is the amount
time between each beacon transmission.
Default Value: 100 milliseconds (range: 100-1000)

DTIM: A DTIM is a countdown informing clients of the next window for
listening to broadcast and multicast messages. When the wireless router has
buffered broadcast or multicast messages for associated clients, it sends the
next DTIM with a DTIM Interval value. Wireless clients detect the beacons and
awaken to receive the broadcast and multicast messages. The default value is
1. Valid settings are between 1 and 255.

Fragment Threshold: Wireless frames can be divided into smaller units
(fragments) to improve performance in the presence of RF interference and at
the limits of RF coverage. Fragmentation will occur when frame size in bytes is
greater than the Fragmentation Threshold. This setting should remain at its
default value of 2346 bytes. Setting the Fragmentation value too low may
result in poor performance.

RTS Threshold: The Request To Send (RTS) function is part of the networking
protocol. A wireless device that needs to send data will send a RTS before
sending the data in question. The destination wireless device will send a
response called Clear to Send (CTS). The RTS Threshold defines the smallest
data packet size allowed to initiate the RTS/CTS function.
Default Value: 2347 (range: 1-2347)

TX Power: This setting allows you to adjust the wireless transmit power to a
lower setting. In busy wireless environments, lowering the transmit power may
improve better performance and connectivity and decrease interference with
neighboring wireless networks.

Short Preamble: Using a short preamble can potentially increase throughput as
the transfer time is 96 microseconds versus the more commonly used long
preamble 192 microseconds. However, using a short preamble is not supported
using 802.11b legacy devices, in some cases cause wireless interoperability
issues, and increase the error rate in some installations. The preamble is the
info. sent from the wireless transmitter to the receiver indicating when data is
incoming.

Short Slot: Short Slot Override defines the amount of time a device waits after
a data frame collision before retransmitting the data. Reducing the time from
20 microseconds (standard) to 9 microseconds can potentially increase
throughput however, can also increase the error rate.

20/40 Coexistence (2.4GHz only): 20/40 MHz Coexistence allows for the auto-
fallback from 40MHz to 20MHz channel width operation when neighboring
802.11 wireless networks are detected.

Guard Interval: Using a short (400ns) guard interval can increase throughput.
However, it can also increase error rate in some installations, due to increased
sensitivity to radio-frequency reflections.

MCS – Allows you to lock down the wireless transmission rate.

Extension channel – Allows you to assign either the upper or lower extension
channels to use for channel bonding when establishing connectivity at the
higher channel widths 40MHz and 80MHz.

A-MPDU: Using Aggregate Multiple Protocol Data Unit will allow the all frames
transmitted to be aggregated into larger size A-MPDU formatted frames before
sending and receiving potentially increasing the overall throughput.

MU-MIMO (5GHz only): Enables MU-MIMO functionality on your router to
optimize downstream bandwidth for multiple concurrent wireless clients.
Please note that wireless clients must also support MU-MIMO capability to
utilize the functionality.