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Re: [hylafax-users] Dreaded phase C errors



Glen B wrote:

2) Why not run @ 38400 on the port? Any 56K modem should be able to operate at a 38400 line rate. 19200 is fine, but it will notably
slow down larger fax jobs.



ModemRate is the rate at which the software (DTE) communicates with the modem (DCE). The rate between the sender and the receiver (DCE to DCE) is limited to what they support, and for the Digi Acceleport running in Class 1/2/2.0 it is 14400 baud.


So increasing ModemRate beyond 14400 only increases the rate at which HylaFAX fills the modem's buffer and will increase the frequency at which the modem invokes flow control. If the modem has a large buffer then this is okay. If the modem handles flow control well then this is also okay. But if the modem has a small buffer and does not handle flow control very well then it could be a problem.

Generally it's best to keep the ModemRate just slightly more than the maximum negotiated fax speed for untested modems to limit the possibility of flow control becoming a problem.

Lee.


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