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TRENDnet User’s Guide
TEW-740APBO / TEW-740APBO2K
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Channel – If Auto Channel is disabled, select the wireless channel the access point
will operate.
Tx Power – You can adjust the wireless output power of the access point to achieve
the appropriate wireless coverage. It is recommended to keep the default setting,
level 9.
Slot Time: By default, the slot time is set to 9 microsecond. Slot time is the amount
of time a device waits after a collision before retransmitting a packet. Reducing the
slot time decreases the overall back-off, which increases throughput. Back-off,
which is a multiple of the slot time, is the random length of time a station waits
before sending a packet on the LAN. For a sender and receiver own right of the
channel the shorter slot time help manage shorter wait time to re-transmit from
collision because of hidden wireless clients or other causes. When collision sources
can be removed sooner and other senders attempting to send are listening the
channel (CSMA/CA) the owner of the channel should continue ownership and finish
their transmission and release the channel. Then, following ownership of the
channel will be sooner for the new pair due to shorter slot time. However, when
long duration of existing collision sources and shorter slot time exist the owners
might experience subsequent collisions. When adjustment to longer slot time can’t
improve performance then RTS/CTS could supplement and help improve
performance. Additionally, if you are encountering wireless connection issues
specifically with wireless WDS bridge linked connectivity, you can click distance and
enter the distance in m (meters) and slot time will be automatically adjusted
accordingly. It is recommended to keep the default setting.
ACK Timeout: ACK timeout is in the range of 1~255 and set in unit of microsecond.
The default value is 85 microsecond. All data transmission in 802.11b/g request an
“Acknowledgement” (ACK) send by receiving radio. The transmitter will resend the
original packet if correspondent ACK failed to arrive within specific time interval,
also refer to as “ACK Timeout”.
ACK Timeout is adjustable due to the fact that distance between two radio links
may vary in different deployment. ACK Timeout makes significant influence in
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.
TX/RX Stream: This will allow you to set the number of wireless streams. By default,
this is set to 2T2R (2 Transmit / 2 Receive) streams approximately 300Mbps
operating @ 64 QAM. If using 1T1R (1 Transmit / 1 Receive) streams the maximum
possible speed is approximately 150Mbps.
Channel Width: Select the appropriate channel width for your wireless network.
This setting only applies to 802.11n. For greater 802.11n performance, select
20/40MHz (Auto) (Options: 20MHz or 20/40MHz (Auto)). It is recommended to use
the default channel bandwidth settings.
Note: Please note that this setting may provide more stability than the higher
channel bandwidth settings such as 20/40MHz (Auto) for connectivity in busy
wireless environments where there are several wireless networks in the area.
o
20 MHz – This mode operates using a single 20MHz channel for
wireless devices connecting at 802.11n on both 2.4GHz and 5GHz. This
setting may provide more stability than 20/40MHz (Auto) for
connectivity in busy wireless environments where there are several
neighboring wireless networks in the area.
o
20/40MHz (Auto) –When 20/40MHz (Auto) is active, this mode is
capable of providing higher performance only if the wireless devices
support the channel bandwidth settings. Enabling 20/40MHz (Auto)
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