Re: Getting serial.c to share it's interrupts.

Richard B. Johnson (root@chaos.analogic.com)
Tue, 14 Apr 1998 16:45:34 -0400 (EDT)


On Tue, 14 Apr 1998, Daniel Egger wrote:

> 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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