Auto channel select (acs), Auto channel select (acs) -15, Caution – HP ProCurve 520wl Wireless Access Point User Manual

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Change your Wireless Interface Settings

2-15

–

Distance Between APs

. Set to

Large

Medium

Small

Microcell,

Minicell

depending on the site survey for your system. The

distance value is related to the

Multicast Rate

(described next). In general, larger systems operate at a slower average rate.

This feature is only available for 802.11b wireless cards. Default is large.

–

Multicast Rate

. Set the rate at which Multicast messages may be sent. This value is related to the

Distance Between APs

parameter (described previously). This feature is only available for 802.11b wireless cards. Default is 2 Mbits/sec.

–

DTIM Period

. Deferred Traffic Indicator Map (DTIM) is used with clients that use power management. DTIM should be left at

the default value. Range is 1-65535.

–

RTS/CTS Medium Reservation

. This value affects message flow control, and should not be changed under normal

circumstances. When set to a value between 0 and 2347, the card uses the RTS/CTS mechanism for packets that are the

specified size or greater. Range is 0 to 2347; default is 2347 (off).

–

Enable Interference Robustness

. Enable this option if other electrical devices in the 2.4 GHz range may be interfering with

the wireless signal. This feature is only available for 802.11b wireless cards. Default is enable.

–

Enable Closed System

. Check this box to allow only clients configured with your specific Network Names to access the

WL520. When disabled, a client configured with the Network Name “ANY” can connect to the WL520. This feature is

only available for 802.11b wireless cards. Default is disable.

–

Enable Load Balancing

. Enable this option so clients can evaluate which access point to associate with, based on current AP

loads, to more evenly balance the load between APs. This feature is only available for systems using two 802.11b wireless

cards. Default is enable.

–

Enable Medium Density Distribution

. Enable this option to automatically notify client stations of roaming thresholds for the

nearby APs. This feature is only available for 802.11b wireless cards. Default is enable.

auto channel select (acs)

When Auto Channel Select is enabled, an WL520 selects its own frequency channel based on interference situation,

bandwidth usage, and adjacent channel use. This is beneficial when deploying WL520 units in a new environment or adding

an WL520 unit in an existing environment.
The first WL520 turned on in an area assigns itself the default channel (which differs based on card type and regulatory

region). When a second WL520 unit is turned on in the vicinity of the first WL520 device, the Auto Channel Select feature

changes the frequency channel of the second unit so there is no interference between the two units. Multiple WL520 units can

be turned on simultaneously to establish proper channel selection. In addition, you may override Auto Channel Select and

manually configure the WL520 device to use a specific Channel.
If you plan to use ACS, note the following:

The range of available channels varies based upon the regulatory domain of your wireless cards. Some regulatory

agencies allow more channels than others.

ACS is enabled by default.

You must disable ACS and manually configure the WL520’s channel if you intend to create a Wireless Distribution

System (see

Wireless Distribution System (WDS)

Configuring Advanced Features

The ability to enable or disable ACS is not available for 802.11a products sold in Europe. See

Dynamic Frequency

Selection (DFS)

for details.

disabling acs

1. From the Web interface, select

Configuration

then click the

Interfaces

tab.

2. Deselect the check box next to

Enable Auto Channel Select

3. Select a frequency channel from the drop-down menu. The clients automatically sense the channel and will configure

themselves to reassociate on the new channel.

CAUTION:

On changing the status you must reboot your WL520, which will disconnect all clients from the WL520.

distance between aps

multicast rate

Large

1 and 2 Mbits/sec

Medium

1, 2, and 5.5 Mbits/sec

Small

1, 2, 5.5 and 11 Mbits/sec

Minicell

1, 2, 5.5 and 11 Mbits/sec

Microcell

1, 2, 5.5 and 11 Mbits/sec