Re: Weird GigE Media Converter Behavior

[Lane Patterson <lane () laneandmimi com>]

On Tue, Aug 24, 2004 at 10:45:22PM -0400, John R. Sosebee <sosebee () bellsouth net> wrote:

> some flava's of the GSR will show/report this .. under show controller but 
> cisco says it's +_ 5 dbm ..
> they say ..  ' You want a router or a meter  ? "
> I have to agree .. would want not the expense of this added in.

Cool, upon further discussion with hardware guys, most of this functionality
is being built into the 3rd party optical components these days, so all the 
vendor has to do is augment the CLI to pass this data through.  If the
capability is there, why not use it?  I must say it would be cool to graph
dBm over months/years in Cricket, and see if you could spot fiber degradation.

However, as you point out, it is important for vendors to document the 
accuracy of the readings in their spec sheets.  +/-5 dBm sounds a bit lame.  
As I understand, these components split off about 2% of the light to take 
the optical power readings.  Don't know if any of them can measure 
reflection to get distance as well?

-Lane

> POS3/0
> SECTION
>    LOF = 0          LOS    = 0                            BIP(B1) = 0
> LINE
>    AIS = 0          RDI    = 0          FEBE = 0          BIP(B2) = 0
> PATH
>    AIS = 5          RDI    = 6          FEBE = 387        BIP(B3) = 6389
>    LOP = 5          NEWPTR = 0          PSE  = 0          NSE     = 0
>
> Framing: SONET
> APS
>
> Optical Power Monitoring
>    Rx optical power in mWs and dBms
>        Port 0 =   0.02 mW, - 15.738 dBm
>
>    Tx laser diode forward bias current I(F) in milliamps
>        Port 0 =  18.009 mA
>
>
>    Clock source:  line