PE> I interpret the V34 spec to say that 64,
PE> 32 and 16-state trellis coding are REQUIRED.

RS> Welp, thats a dud interpretation, its not.

PE> Oh yeah.  Read the spec recently?

I have actually on that particular bit.

PE> It says:

PE> 9.6.3.2

PE> The encoder shall be selected by the receiving modem
PE> during Phase 4 of the start-up procedures specified
PE> in 11.4 or 12.4. The following encoders ARE AVAILABLE:

PE> - 16-state
PE> - 32-state
PE> - 64-state

PE> Note that it doesn't use somethings soft like "may be available".

Soorree, that doesnt qualify as mandating that a modem
MUST have all of those available. AND there is rather
more than just that para on that particular question too.

PE> However, it is in the hands of the
PE> answering modem to CHOOSE any one of the 3.

PE> Otherwise, how does the USR know that it is
PE> allowed to ask for 64-state trellis coding or not?

RS> Thats all spelt out in that standard, how a
RS> range of alts is offered and accepted or refused.

PE> Which section would that be in?  Presumably not the bit that says:

PE> 29:30 Trellis encoder select bits:
PE> 0 = 16 state, 1 = 32 state, 2 = 64 state, 3 = reserved for ITU
PE> Receiver REQUIRES remote-end transmitter
PE> to use selected trellis encoder.

Again, you are reading to much into the specific wording
there on the question of all three being mandated.

PE> NOTE - Source modem does not use bits 29-32, and should set these bits to 0

PE> So Rod, just where does the transmitter get to select
PE> maximum supported trellis-encoding, when it is SPECIFICALLY
PE> REQUIRED to zero out the bits that deal with trellis coding?

Now try explaining how the rockwell chipsets which
dont have 64S actually manage to work Paul. Have fun.
@EOT:

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