Tyco 0-1591700-x user manual Page 27 of, Wireless Access Point Model, User Manual, PL0356, Issue

Wireless Access Point Model 0-1591700-x User Manual Page 27 of 33

802.11g Stations Only

To optimise throughput performance of mixed networks containing both IEEE802.11b and 802.11g clients, then this control should be Disabled by default. This mixed client mode delivers throughput of up to 9Mbps. However if the network contains no IEEE802.11b clients, then setting this control as Enabled can significantly increase the throughput performance of any IEEE802.11g clients to up to 25Mbps.

This selection is only needed if optimised throughput performance of mixed client types is required. This mode is detailed in the IEEE802.11g standard.

Protection Mode

Whenever an IEEE802.11b client is present, then the IEEE802.11g clients and access point will automatically enable a protection mode to prevent the higher speed 802.11g transmissions from disrupting the slower 802.11b transmissions. This is achieved by automatic adjustment of preambles, slot times etc to get the best performance of the client population. This control has three options:-

•Auto

•Always

•None

The Auto mode is the default mode and delivers good performance. The Always mode permanently enables the protection mode and can impact throughput. The None mode permanently disables the protection mode.

Protection Rate

This mode selects the protection rate from a pull-down list of 1, 2, 5,5 and 11Mbps. The default value is 11Mbps.

Protection Type

This control manages the RTS and CTS relationships. There are two options:-

•RTS-CTS

•CTS-Only

RTS-CTSis the default mode. RTS is the equivalent of a reservation request sent by a device on the network. CTS is the response to this request and informs the client device that the request has been received and that it is permitted to send the data packet.

CTS-Only is used in mixed IEEE802.11b/g networks where there is provision for the access point to send only the CTS packet. This is based on the CTS being sent without the need for it to be in response to an RTS packet.

Note that these protection mechanisms adversely impact throughput but can deliver optimal performance of mixed IEEE802.11b/g networks.

Short Slot Time

This value can be used to obtain slightly better throughput under high network loading conditions. The default is Enabled.

PL0356 ©2003TycoElectronics Issue 1