Changes between Version 21 and Version 22 of Documentation/FAQ

Timestamp:

Dec 21, 2005, 8:00:08 PM (18 years ago)

Author:

Surya Satyavolu

Comment:

—

Documentation/FAQ

@@ -122 +122 @@
 
 Can I reboot or power cycle my nodes?
-------------------------------------
+--------------------------------------
 
 Yes. 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.
@@ -220 +220 @@
 
 
+
 How do I set the rate to a fixed value?
 ----------------------------------------
 node.net.w0.rate = '1M' 
 
-
-
-
-
+How do I set the transmit power for the card?
+----------------------------------------------
+If you are using nodehandler, all you need is to specify
+node.net.w0.tx_power = value
+
+nodeagent will take care of the underlying commands
+
+If you are running it on your own, then
+
+iwconfig eth2 txpower <-12 to 20> for Intel
+
+echo <power-level> >>  /proc/sys/dev/ath0/txpowlimit
+
+The values are from 1 to 100 in milliwatts which translate to 0 to 18dBm (it is clamped at 18 dBm)
+
+On the 64 node grid, I dont think you will be able to achieve isolation even with -12 dBm , you may still need some noise. 
  
 }}}