Chapter 8 Wireless Screen

 

Table 26 Wireless: MBSSID

 

LABEL

DESCRIPTION

 

 

Disable channel

This field displays only when you select 802.11a or 802.11n/a in

 

 

switching for DFS

the 802.11 Radio Mode field. Select this if you do not want to use

 

 

 

DFS (Dynamic Frequency Selection).

 

 

 

DFS (dynamic frequency selection) allows an AP to detect other

 

 

 

devices in the same channel. If there is another device using the

 

 

 

same channel, the AP changes to a different channel, so that it can

 

 

 

avoid interference with radar systems or other wireless networks.

 

 

 

 

 

 

Super Mode

(For NWA-3160 and NWA-3163 only)

 

 

 

Select this to improve data throughput on the WLAN by enabling

 

 

 

fast frame and packet bursting.

 

 

 

 

 

 

Channel ID

Set the operating frequency/channel depending on your particular

 

 

 

region.

 

 

 

To manually set the NWA to use a channel, select a channel from

 

 

 

the drop-down list box. Click MAINTENANCE and then the

 

 

 

Channel Usage tab to open the Channel Usage screen to make

 

 

 

sure the channel is not already used by another AP or independent

 

 

 

peer-to-peer wireless network.

 

 

 

To have the NWA automatically select a channel, click Scan

 

 

 

instead.

 

 

 

 

 

 

Disable DCS to

This appears if the DCS feature is enabled.

 

 

unlock

Click this to disable DCS and select a channel ID manually.

 

 

 

 

 

 

Note: DCS is Disabled by default

 

 

 

 

 

 

Short GI

This field is available only when 802.11n/g or 802.11n/a is

 

 

 

selected as the 802.11 Radio Mode. Select Enable to use Short

 

 

 

GI (Guard Interval). The guard interval is the gap introduced

 

 

 

between data transmission from users in order to reduce

 

 

 

interference. Reducing the GI increases data transfer rates but also

 

 

 

increases interference. Increasing the GI reduces data transfer

 

 

 

rates but also reduces interference.

 

 

 

 

 

 

A-MPDU

This field is available only when 802.11n/g or 802.11n/a is

 

 

Aggregation

selected as the 802.11 Radio Mode. Select Enable to allow the

 

 

 

grouping of several A-MSDUs (Aggregate MAC Service Data Units)

 

 

 

into one large A-MPDU (Aggregate MAC Protocol Data Unit). This

 

 

 

function allows faster data transfer rates.

 

 

 

 

 

 

RTS/CTS Threshold

Use RTS/CTS to reduce data collisions on the wireless network if

 

 

 

you have wireless clients that are associated with the same AP but

 

 

 

out of range of one another. When enabled, a wireless client sends

 

 

 

an RTS (Request To Send) and then waits for a CTS (Clear To Send)

 

 

 

before it transmits. This stops wireless clients from transmitting

 

 

 

packets at the same time (and causing data collisions).

 

 

 

A wireless client sends an RTS for all packets larger than the

 

 

 

number (of bytes) that you enter here. Set the RTS/CTS equal to or

 

 

 

higher than the fragmentation threshold to turn RTS/CTS off.

 

 

 

 

 

 

Fragmentation

The threshold (number of bytes) for the fragmentation boundary for

 

 

Threshold

directed messages. It is the maximum data fragment size that can

 

 

 

be sent. Enter an even number between 256 and 2346.

 

 

 

 

 

 

141

NWA-3160 Series User’s Guide