[SI-LIST] Re: BER 1e-12 Vs 1e-15 test times

Hey Naga,
For Rx testing, it's possible to test to *arbitrary* BER (1E-18, shit,
1E-40) in seconds using Crest Factor Emulation (CFE) described here:
http://ransomsnotes.com/index_htm_files/8-WP1_Ransom_Stephens.pdf 
In general, using standard equipment the fastest approach is the bracketing
method, essentially what Steve suggested - though Steve included important
caveats that I didn't cover in this paper:
http://cp.literature.agilent.com/litweb/pdf/5989-2933EN.pdf 
The former is being patented by Tek and me (so I can get you the rights) but
the latter was never patented and will work with any standard BERT
equipment. If you read both papers you'll be on pretty firm ground with how
to make the measurements fastest, whether you use those techniques or invent
your own.
Have fun!
Ransom

> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of steve weir
> Sent: Tuesday, January 10, 2012 11:59 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: BER 1e-12 Vs 1e-15 test times
> 
> That all depends on what you put into the channel, and how you evaluate
> it.  If you naively apply random data bounded by the run length of your
> encoding scheme, then you need to have multiple intervals of your error
> rate divided by your bit frequency.  That's not so bad for 1E-12 as you
> can get 3.7E13 bits per hour.  1E-15 would however require almost a week
> just to get 5E15 bits through the channel.
> 
> This is why people focus on stress patterns rather than just random data.
> 
> Steve.
> On 1/10/2012 11:40 AM, nagachander.sing@xxxxxxxxxxxxxxxxxxxx wrote:
> > Hi all,
> > Any comments on the following question will be highly appreciated
> >
> > 1. For receiver testing, what is the appropriate test time for BER 1e-12
> > and BER 1e-15 at 10.3125Gbps.... Ofcourse i am interested in high
> > confidence measurements...
> >
> >
> > Thanks,
> > Naga
> >
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> 
> --
> Steve Weir
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