User's Manual

Chapter 6 | Wireless Settings
Radio Settings
– 74 –
the packet size equals or exceeds the RTS threshold, the RTS/CTS (Request to
Send / Clear to Send) mechanism will be enabled.
The access points contending for the medium may not be aware of each other.
The RTS/CTS mechanism can solve this “Hidden Node Problem.” (Range: 1-2346
bytes: Default: 2346 bytes)
◆ Short Guard Interval — The 802.11n draft specifies two guard intervals: 400ns
(short) and 800ns (long). Support of the 400ns GI is optional for transmit and
receive. The purpose of a guard interval is to introduce immunity to
propagation delays, echoes, and reflections to which digital data is normally
very sensitive. Enabling the Short Guard Interval sets it to 400ns. (Default:
Disabled)
◆ Aggregate MAC Protocol Data Unit (A-MPDU) — Enables / disables the
sending of this four frame packet header for statistical purposes. (Default:
Enabled)
◆ A-MPDU Length Limit (1024-65535) — Defines the A-MPDU length. (Default:
65535 bytes; Range: 1024-65535 bytes)
◆ Aggregate MAC Service Data Unit (A-MSDU) — Enables / disables the
sending of this four frame packet header for statistical purposes. (Default:
Enabled)
◆ Disable HT20/HT40 Coexistance — Prevents 802.11n 20 MHz and 40 MHz
channel bandwidths from operating together in the same network.
(Default: Disabled)
◆ Antenna Selection — Sets the radio to use one or both antennas. (Options:
Left, Right, Right+Left; Default: Right+Left)
◆ Minimum CCK Rate — (2.4 GHz radio only) The minimum CCK data rate at
which the AP transmits packets on the wireless interface. (Options: 1, 2, 5.5,
11 Mbps; Default 1 Mbps)
◆ Minimum OFDM Rate — The minimum OFDM data rate at which the AP
transmits packets on the wireless interface. (Range: 6, 9, 12, 18, 24, 36, 48,
54 Mbps; Default 6 Mbps)
◆ Minimum Single Stream Rate — The minimum 802.11n single stream data
rate at which the AP transmits packets on the wireless interface. (Range: MCS0-
MCS7; Default MCS0)
◆ Minimum Double Stream Rate — The minimum 802.11n double stream data
rate at which the AP transmits packets on the wireless interface. (Range: MCS8-
MCS15; Default MCS8)