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FAST Protocol
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Re: Proposal For New FAST Operator Default-Delta
Clive Browning / Rapid Addition Ltd
29 Apr 2006 5:55PM ETSorry to reply to my own message...
Obviously the default-delta operator for numerics would only come in to its own for "larger" numbers using more than 1 byte of data! My example would have resulted in 1 byte being transmitted either way!
Clive
>
> We are seeing the following "general" conclusions for FAST field
> operators:
>
> Defaults, Increments, Copys and Deltas (when sequence is always
> increasing) all work well for numerics.
>
> Defaults and Copys are also good for strings, but Deltas do not work so
> well in practice…
>
> e.g.
>
> AAAA (transmit AAAA) AAAAB (transmit B) AAAABC (transmit C)
> AAAABC (transmit nothing) AAAABCD (transmit D)
>
> Above does work fine for string delta operator
>
> But…
>
> AAAA AAAAB AAAABC AA
>
> Does not work as there is currently no way to “reset” to a new starting
> delta value.
>
> What might be useful is a Default-Delta operator – e.g. just pass the
> difference from a default value …
>
> Default = AAAA
>
> AAAA (transmit nothing) AAAAB (transmit B)
> AAAABB (transmit BB) AAAAC (transmit C)
>
> This might also be useful for numerics, e.g. default = 225
>
> 227 (transmit 2) 229 (transmit 4) 226 (transmit
> 1) 230 (transmit 5)
>
> Is it worth investigating this for the next FAST release?
>
> Clive Browning Rapid Addition Ltd
Re: Proposal For New FAST Operator Default-Delta
Clive Browning / Rapid Addition Ltd 29 Apr 2006 5:55PM ET
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