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Re: PAM-5, what are your BERs ?


At 09:42 AM 01-03-2000 -0600, Ed Grivna wrote:
>Hi Sean,
>unfortuantely, FEC has additional drawbacks beyond just latency.  the
>primary concern here would be that you need to ratchet-up the signaling 
>rate even faster to include the overhead of sending the FEC bits.  
>Depending on the amount of redundancy in the FEC information,
>you may need to increase the signalling rate as much as 5-to-10%.

this condition was allowed, in one or more very early 5-PAM MAS 
proposals, and was one of the strongest reasons for choosing 5 levels 
rather than 4 or something less.


J M Wincn, Staff Engineer
Cielo Communications, Inc.
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