Software Manual

WE865-DUAL Software User Guide

1vv0300788 Rev. 0 08/08/08

You may append the suffix k, M or G to the value (decimal multiplier: 10^3, 10^6 and 10^9

b/s), or add enough '0'. Values below 1000 are card specific, usually an index in the bit-rate

list. Use auto to select automatic bit-rate mode (fallback to lower rate on noisy channels),

which is the default for most cards, and fixed to revert back to fixed setting. If you specify a

bit-rate value and append auto, the driver will use all bit-rates lower and equal than this value.

Examples:

iwconfig eth0 rate 11M

iwconfig eth0 rate auto

iwconfig eth0 rate 5.5M auto

txpower

For cards supporting multiple transmit powers, sets the transmit power in dBm. If W is the

power in Watt, the power in dBm is P= 30 + 10.log(W). If the value is postfixed by mW, it will

be automatically converted to dBm.

In addition, on and off enable and disable the radio, and auto and fixed enable and disable

power control (if those features are available).

Examples:

iwconfig eth0 txpower 15

iwconfig eth0 txpower 30mW

iwconfig eth0 txpower auto

iwconfig eth0 txpower off

sens

Set the sensitivity threshold. This define how sensitive is the card to poor operating conditions

(low signal, interference).

Positive values are assumed to be the raw value used by the hardware or a percentage,

negative values are assumed to be dBm.

Depending on the hardware implementation, this parameter may control various functions.

On modern cards, this parameter usually control handover/roaming threshold, the lowest

signal level for which the hardware remains associated with the current Access Point. When

the signal level goes below this threshold the card starts looking for a new/better Access

Point. Some cards may use the number of missed beacons to trigger this. For high density of

Access Points, a higher threshold make sure the card is always associated with the best AP,

for low density of APs, a lower threshold minimize the number of failed handoffs.

On more ancient card this parameter usually controls the defer threshold, the lowest signal

level for which the hardware considers the channel busy. Signal levels above this threshold

make the hardware inhibits its own transmission whereas signals weaker than this are

ignored and the hardware is free to transmit. This is usually strongly linked to the receive

threshold, the lowest signal level for which the hardware attempts packet reception. Proper

setting of these thresholds prevents the card to waste time on background noise while still

receiving weak transmissions. A modern design seems to control those thresholds

automatically.

Examples:

iwconfig eth0 sens -80