[mrtg] using MRTG to graph cablemodem

[Roman Hochuli]

Hello List

I am trying to graph the SignalNoiseRatio of DOCSIS Cablemodems.

My problem is the values returned are as shown below like '37.6 dB'.
MRTG seems to have trouble with the characters in this string. Am I
right with this...? Or is there somebody who is already doing this...?

Is the only possibility to cut off the ' dB' with writing an external
measuring software which gives the numbers back to mrtg...?

Thanks for you inputs.

> [garfield at lab garfield]$ snmpget -m all elsa-router public docsIfSigQSignalNoise.3 >    docsIfCmStatusTxPower.2
> > transmission.docsIfMib.docsIfMibObjects.docsIfBaseObjects.
>    docsIfSignalQualityTable.docsIfSignalQualityEntry.docsIfSigQSignalNoise.3 = 37.6 dB
> transmission.docsIfMib.docsIfMibObjects.docsIfCmObjects.
>    docsIfCmStatusTable.docsIfCmStatusEntry.docsIfCmStatusTxPower.2 = 29.5 dBmV

--snip
### Interface 6 >> Descr: 'SignalNoiseRatio' | Name: 'Signal-Noise
Ratio' | Ip: '' | Eth: '' ###

Target[elsa-router.cablelab.gpstechnik.ch_6]:
docsIfSigQSignalNoise.3&docsIfCmStatusTxPower.2:public at elsa-router.cablelab.gpstech
nik.ch:::::2
MaxBytes[elsa-router.cablelab.gpstechnik.ch_6]: 45
Title[elsa-router.cablelab.gpstechnik.ch_6]: Traffic Analysis for 6 --
Options[elsa-router.cablelab.gpstechnik.ch_6]: gauge
PageTop[elsa-router.cablelab.gpstechnik.ch_6]: <H1>Traffic Analysis for
6 -- </H1>
 <TABLE>
   <TR><TD>System:</TD>     <TD> in </TD></TR>
   <TR><TD>Maintainer:</TD> <TD></TD></TR>
   <TR><TD>Description:</TD><TD>Signal-Noise Ratio  </TD></TR>
   <TR><TD>ifType:</TD>     <TD>CATV Signal-Noise Ratio </TD></TR>
   <TR><TD>ifName:</TD>     <TD>Signal-Noise Ratio</TD></TR>
   <TR><TD>Max Speed:</TD>  <TD>45 dbmV</TD></TR>
 </TABLE>
--snap


-- 
Kind regards,
Roman Hochuli

GPS-Technik AG
Zürcherstrasse 137
8952 Schlieren
Switzerland
Tel +41-1-7329977
Fax +41-1-7311840

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