[time-nuts] Opera coordinator has resigned

J. Forster jfor at quikus.com
Sat Mar 31 20:42:57 UTC 2012


If you use a good design on the receivers, AGC output is virtually free.
It doesn't take much more to run that signal to a go/no go comparator.

-John

============


>
> jfor at quikus.com said:
>> It was happenstance that the OPERA connector was mated enough to work,
>> but
>> not enough to work properly.
>
> A while ago, I was thinking that half the problem was a design error.  But
> then I couldn't figure out how to do it right.  Maybe monitoring the pulse
> height would have caught this error.  Maybe a different encoding scheme
> would
> be easier to monitor.
>
> I've worked with fibers for communications, but that was many years ago.
> The
> receivers have AGCs.  If you monitor the AGC control voltage you should be
> able to catch things like loose connections.  I don't think we ever did
> that.
>  We did monitor the error rate.  It was always 0.
>
> But that adds another level of complexity.  Checking/monitoring is good.
> Complexity is evil.  How do you decide?
>
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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