Users Guide

Dell PowerConnect W-Series ArubaOS 6.1 | User Guide Secure Enterprise Mesh | 241
4. Enter a name for the new profile.
5. Configure the high-throughput SSID described in Table 44, then click Apply to save your settings. The
profile name appears in the Mesh High-throughput SSID Profile list with your configured settings.
Table 44 Mesh High-Throughput SSID Profile Configuration Parameters
Parameter Description
Mesh high-throughput SSID
profile
Enter the name of an existing mesh high-throughput SSID profile to modify that profile, or
enter a new name or create a new mesh high-throughput profile. The mesh high-throughput
profile can have a maximum of 32 characters. To view existing high-throughput SSID radio
profiles, use the command: show ap mesh-radio-profile.
High throughput enable (SSID) Enable or disable high-throughput (802.11n) features on this SSID. This parameter is enabled
by default.
40 MHz channel usage Enable or disable the use of 40 MHz channels. This parameter is enabled by default.
Low-density Parity Check If enabled, the AP will advertise Low-density Parity Check (LDPC) support. LDPC improves
data transmission over radio channels with high levels of background noise.
MPDU Aggregation Enable or disable MAC protocol data unit (MPDU) aggregation.
High-throughput mesh APs are able to send aggregated MAC protocol data units (MDPUs),
which allow an AP to receive a single block acknowledgment instead of multiple ACK
signals. This option, which is enabled by default, reduces network traffic overhead by
effectively eliminating the need to initiate a new transfer for every MPDU.
Max transmitted A-MPDU size Maximum size of a transmitted aggregate MPDU, in bytes.
Range: 1576–65535
Max received A-MPDU size Maximum size of a received aggregate MPDU, in bytes. Allowed values: 8191, 16383, 32767,
65535.
Min MPDU start spacing Minimum time between the start of adjacent MPDUs within an aggregate MPDU, in
microseconds. Allowed values: 0 (No restriction on MDPU start spacing), .25 µsec, .5 µsec, 1
µsec, 2 µsec, 4 µsec.
Supported MCS set A list of Modulation Coding Scheme (MCS) values or ranges of values to be supported on this
SSID. The MCS you choose determines the channel width (20MHz vs. 40MHz) and the
number of spatial streams used by the mesh node.
The default value is 1–15; the complete set of supported values. To specify a smaller range of
values, enter a hyphen between the lower and upper values. To specify a series of different
values, separate each value with a comma.
Examples:
2–10
1,3,6,9,12
Range: 0–15.
Short guard interval in 20 MHz
mode
Enable or disable use of short (400ns) guard interval for a W-AP130 Series AP in 20 MHz
mode. This parameter is enabled by default.
A guard interval is a period of time between transmissions that allows reflections from the
previous data transmission to settle before an AP transmits data again. An AP identifies any
signal content received inside this interval as unwanted inter-symbol interference, and
rejects that data. The 802.11n standard specifies two guard intervals: 400ns (short) and 800ns
(long). Enabling a short guard interval can decrease network overhead by reducing
unnecessary idle time on each AP. Some outdoor deployments, may, however require a
longer guard interval. If the short guard interval does not allow enough time for reflections to
settle in your mesh deployment, inter-symbol interference values may increase and degrade
throughput.