hi,
I'm trying to validate manually the cisco formula used to calculate the percentage of correctable and uncorrectable FECs and put it on a graph, however I find that my result is not exactly in the ranges mentioned by cisco, maybe I'm doing something wrong, someone has any suggestions? this is the procedure I follow:
Get values for uptream0 by snmp:
TIME 8:50 (XY0)
Interface Unerrorreads Corrected Uncorrectables
Cable1/0/U0 360300337 7358499 20809
TIME 8:55 (XY1)
Interface Unerrorreads Corrected Uncorrectables
Cable1/0/U0 360581464 7358511 20828
Formula:
%Correctable = [(Ec1 – Ec0)/ [(Eu1 – Eu0) + (Ec1 – Ec0) + (C1 – C0)]] * 100
Where:
C = Unerroreds
Ec = Correcteds
Eu = Uncorrectables
%Correctable = [(7358511 – 7358499)/ [(20828 – 20809) + (7358511 – 7358499) + (360581464 – 360300337)]] * 100
Is that correct?
Yup, that's what I do with the numbers from our BSR64k, and it works like a charm.
Hi Bobby,
which software did you use for graph?
regards,
wittmann
I was pointing where the CW uncorrected and SNR falls for a month, but not in all cases I find a pattern
[IMG]http://i263.photobucket.com/albums/ii141/xoir/graph-SNR-vs-FEC.png[/IMG]
Wittmann, it's home made development
I have seen in other upstream where the SNR is more "unstable" and the amount in percentage of uncorrected Codeworks is a bit higher and more consistent, even crosses the limit of 0.5 which is already considered risky, does this graphic looks trustworthy?
[IMG]http://i263.photobucket.com/albums/ii141/xoir/CW-SNR.png[/IMG]
Regards,
Bobby
There is anybody who uses ZABBIX to monitoring the FEC?