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Chapter 7: Advanced Tab
AirRouter
HP User Guide
Ubiquiti Networks, Inc.
Fragmentation Threshold
Specifies the maximum size
for a packet before data is fragmented into multiple
packets. The range is 256-2346 bytes, or word “off”. Setting
the Fragmentation Threshold too low may result in poor
network performance.
The use of fragmentation can increase the reliability
of frame transmissions. When sending smaller frames,
collisions are much less likely to occur. However lower
values of the Fragmentation Threshold will result in lower
throughput as well. It is recommended that you only make
slight modifications or none at all to the Fragmentation
Threshold value. The default setting of 2346 is optimum in
most wireless network use cases.
The AirRouter HP has a new auto-acknowledgement
timeout algorithm which dynamically optimizes the
frame acknowledgement timeout value without user
intervention. This is a critical feature required for
stabilizing long-distance 802.11n outdoor links. The user
also has the ability to enter the value manually, but it’s not
recommended.
Distance
Specify the distance value in miles (or
kilometers) using the slider or entering the value manually.
The signal strength and throughput falls off with range.
Changing the distance value will change the ACK Timeout
to the appropriate value of the distance.
ACK Timeout
Specify the ACK Timeout. Every time the
station receives the data frame it sends an ACK frame to
the AP (if transmission errors are absent). If the station
receives no ACK frame from the AP within set timeout it
re-sends the frame. The performance drops because if too
many data frames are re-sent, thus if the timeout is set
too short or too long, it will result poor connection and
throughput performance.
Changing the ACK Timeout value will change the Distance
to the appropriate distance value for the ACK Timeout.
•
Auto Adjust
Control will enable the ACK Timeout
Self-Configuration feature. If enabled, ACK Timeout
value will be derived dynamically using an algorithm
similar to the Conservative Rate Algorithm (used in
AirOS v3.4). It is very recommended to use the Auto
Adjust option for 802.11n.
If two or more stations are located at a considerably
different distance from the Access Point they are
associated with, the highest ACK Timeout for the
farthest station should be set on the AP side. The
AirRouter HP includes an improved ACK Timeout
algorithm.
Aggregation
A part of the 802.11n standard that allows
sending multiple frames per single access to the medium
by combining frames together into one larger frame. It
creates the larger frame by combining smaller frames with
the same physical source and destination end points and
traffic class (i.e. QoS) into one large frame with a common
MAC header.
•
Frames
Determines the number of frames combined
on the new larger frame.
•
Bytes
Determines the size (in Bytes) of the larger frame.
Multicast Data
This option allows all the Multicast packet
pass-through functionality. By default this option is
disabled.
Enable Extra Reporting
Feature will report additional
information (i.e. Device Name) in the 802.11 management
frames. This information is commonly used for system
identification and status reporting in discovery utilities
and Router operating systems.
Enable Client Isolation
This option allows packets only
to be sent from the external network to the CPE and vice
verse (applicable for Access Point and Access Point WDS
mode only). If Client Isolation is enabled, wireless stations
connected to the same AP will not be able to interconnect
on both the layer 2 (MAC) and layer 3 (IP) level. This is
effective for associated stations and WDS peers as well.
Sensitivity Threshold, dBm
Defines the minimum client
signal level accepted by the Access Point, for the client to
remain associated. Any client with a signal level lower than
that specified will be kicked out. This feature is helpful to
maintain good signal levels within associated stations,
assuring better overall performance.
•
Off
Clearing the checkbox disables the feature.
Summary of Contents for AirRouterHP
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