Graphing for wireless RSSI negative value

hajid

15-04-2005 23:27:16

i want make graph for monitoring my radio. with snmpget i can get the data that return negative number. how to make graph for this value. how about minimum value, maximum value,multiplier value shoul i fill?
snmpget -c public -v 1 172.33.0.5 .1.3.6.1.4.1.841.201.4.6.0
return data SNMPv2-SMIenterprises.841.201.4.6.0 -70

silfreed

17-04-2005 09:12:25

[quoteecee6a92a5="hajid"]i want make graph for monitoring my radio. with snmpget i can get the data that return negative number. how to make graph for this value.[/quoteecee6a92a5]

Shouldn't be a problem.

[quoteecee6a92a5="hajid"]how about minimum value, maximum value,multiplier value shoul i fill?[/quoteecee6a92a5]

Since this is probably a gauge (probably SNR dBm?), I wouldn't worry about min/max for the monitor too much. Just let them 'U' and things should be fine.
I would just set the multipler to be '1' (the defautl). We typically only change it when we need to alter the scale of the graph.
Enter your OID in the SNMP tests and create your monitor as a gauge. After that, you can either create a custom or template graph based on whether you'll be making more graphs like this or not. Let me know if you need some help on making a custom/template graph and applying it to your device; I think there's some other posts around here about that, though.

-Doug

jbaland

28-07-2005 17:08:18

The normal graphing like above suggests works just fine. NetMRG will graph the negative number, and 0 will be at the top instead of the bottom.

I had one unique case where I wanted to compare my negative dBm reading with a positive temperature reading on another device. For this, I entered a multiplier of -1 in the graph setup for the dBm item. Remember if you multiply a negative with -1 you inverse the data so it graphs as a positive number.