> On Mon, 13 Apr 1998, you wrote:
>
> >> No.... modems are not sync.... V42.bis etc can't provide that...
>
> >Sorry to disappoint you but Albert is right. All modern modems are synchronous
> >with an async adaption layer presented to the user
>
> How can you provide syncPPP if you have no constant transferrate?
When the modem is idle, i.e., when no user data is being transferred,
the modem is actually transferring a pseudo-random 8-byte (for an
8-bit constellation) word stream.
User data is XORed into this word stream. It is extracted, also as
an XOR operation.
Cheers,
Dick Johnson
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