Cisco Small Business RV220W Administration Manual page 76

Configuring the Wireless Network
Configuring the Wireless Radio Properties
STEP 4
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STEP 8
STEP 9
STEP 10
Cisco RV220W Administration Guide
The Request to Send (RTS) Threshold is the packet size, in bytes, that requires the
AP to check the transmitting frames to determine if an RTS/Clear to Send (CTS)
handshake is required with the receiving client. Using a small value causes RTS
packets to be sent more often, consuming more of the available bandwidth,
reducing the apparent throughput of the network packets. The default value is
2346, which effectively disables RTS.
The Fragmentation Threshold is the maximum length of the frame, in bytes,
beyond which packets must be fragmented into two or more frames. Collisions
occur more often for long frames because while sending them, they occupy the
channel for a longer time. The default value is 2346, which effectively disables
fragmentation. If you experience a high packet error rate, you can slightly increase
the fragmentation threshold; setting the fragmentation threshold too low may
result in poor network performance. Only minor reduction of the default value is
recommended.
Choose the Preamble Mode. The 802. 1 1b standard requires that a preamble be
appended to every frame before it is transmitted through the air. The preamble
may be either the traditional "long" preamble, which requires 192 μs for
transmission, or it may be an optional "short" preamble that requires only 96 μs. A
long preamble is needed for compatibility with the legacy 802. 1 1 systems
operating at 1 and 2 Mbps. The default selection is long.
Choose the Protection Mode. Select None (the default) to turn off CTS. The CTS-
to-Self Protection option enables the CTS-to-Self protection mechanism, which is
used to minimize collisions among stations in a mixed 802. 1 1b and 802. 1 1g
environment. This function boosts the Cisco RV220W's ability to catch all wireless
transmissions but severely decreases performance.
(Optional) Next to U-APSD, check the Enable box to enable the Unscheduled
Automatic Power Save Delivery (also referred to as WMM Power Save) feature
that allows the radio to conserve power.
The Short Retry Limit and Long Retry Limit fields determine the number of times
the AP will reattempt a frame transmission that fails. The limit applies to both long
and short frames of a size less than or equal to the RTS threshold.
Click Save.
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