[mrtg] Re: signal to noise

[Roman Hochuli]

hi daniel

first: thanks for you help in the other thread.

> > How can I use MRTG to graph the signal to noise ratio for my cable modem?  I
> > do not have access to my uBR.  Plus I use a GI Surfboard SB3100.

> You con't. You would need access to the router in order to graph SNR. 

IMHO your wrong with this point. i am graphing snr of cms at the moment.

out of RFC2670 (DOCS-IF-MIB):

--snip
docsIfSigQSignalNoise OBJECT-TYPE
        SYNTAX      TenthdB
        UNITS       "dB"
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "Signal/Noise ratio as perceived for this channel.
             At the CM, describes the Signal/Noise of the downstream
             channel.  At the CMTS, describes the average Signal/Noise
             of the upstream channel."
        REFERENCE
            "DOCSIS Radio Frequency Interface specification,
             Table 2-1 and 2-2"
        ::= { docsIfSignalQualityEntry 5 }
--snap

i am not sure if the gi-cm fullfills the specs, but if it does it should
be possible to graph this with the hints in the 'using MRTG to graph
cablemodem'-thread.

-- 
Kind regards,
Roman Hochuli

GPS-Technik AG
Zürcherstrasse 137
8952 Schlieren
Switzerland
Tel +41-1-7329977
Fax +41-1-7311840
X-NCC-RegID: ch.gps

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