Changes between Version 21 and Version 22 of Documentation/FAQ


Ignore:
Timestamp:
Dec 21, 2005, 8:00:08 PM (19 years ago)
Author:
Surya Satyavolu
Comment:

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  • Documentation/FAQ

    v21 v22  
    122122
    123123Can I reboot or power cycle my nodes?
    124 ------------------------------------
     124--------------------------------------
    125125
    126126Yes. Each of the radio nodes is independently power controlled by the chasis manager. If your node hangs, or is otherwise unresponsive, you can reboot it.  From the console machine, wget -0 - http://repository:5012/cmc/ and use the XML interface to modify the state of your node.
     
    220220
    221221
     222
    222223How do I set the rate to a fixed value?
    223224----------------------------------------
    224225node.net.w0.rate = '1M'
    225226
    226 
    227 
    228 
    229 
     227How do I set the transmit power for the card?
     228----------------------------------------------
     229If you are using nodehandler, all you need is to specify
     230node.net.w0.tx_power = value
     231
     232nodeagent will take care of the underlying commands
     233
     234If you are running it on your own, then
     235
     236iwconfig eth2 txpower <-12 to 20> for Intel
     237
     238echo <power-level> >>  /proc/sys/dev/ath0/txpowlimit
     239
     240The values are from 1 to 100 in milliwatts which translate to 0 to 18dBm (it is clamped at 18 dBm)
     241
     242On the 64 node grid, I dont think you will be able to achieve isolation even with -12 dBm , you may still need some noise.
    230243 
    231244}}}