Re: [hylafax-users] High failure rate on sending

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Daniel Hillhouse wrote:

> Nov 04 13:57:06.99: [ 7935]: SEND recv PPR (partial page request)
> Nov 04 13:57:06.99: [ 7935]: <-- [9:AT+FRS=7\r]
> Nov 04 13:57:07.01: [ 7935]: --> [2:OK]
> Nov 04 13:57:07.01: [ 7935]: SEND send frame number 0
> Nov 04 13:57:07.01: [ 7935]: SEND send frame number 1
> Nov 04 13:57:07.01: [ 7935]: SEND send frame number 59
> Nov 04 13:57:07.01: [ 7935]: SEND send frame number 60
> Nov 04 13:57:07.01: [ 7935]: SEND send frame number 61
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 62
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 63
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 122
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 123
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 124
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 125
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 126
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 186
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 187
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 188
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 189
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 190
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 248
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 249
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 250
> Nov 04 13:57:07.02: [ 7935]: SEND send frame number 251
> Nov 04 13:57:07.03: [ 7935]: SEND send frame number 252


Notice that there seem to be "chunks" of data that need to get resent... 
frames 0-1, 59-63, 122-126, 186-190, 248-252.  This is highly suspicious 
of sender-side flow-control errors between HylaFAX and the modem.  In 
simple terms, I think that your modem has broken flow control for 
whichever flow-control setting you are using in your modem config file.  
So in your modem config file if you have "ModemFlowControl: xonxoff" 
please change that to "rtscts" or vice-versa.  If you have no 
ModemFlowControl entry in your modem config file then add 
"ModemFlowControl: rtscts".

> Nov 04 13:58:11.09: [ 7935]: SEND recv RNR (receive not ready)
> Nov 04 13:58:11.09: [ 7935]: <-- [9:AT+FRS=7\r]
> Nov 04 13:58:11.11: [ 7935]: --> [2:OK]
> Nov 04 13:58:11.11: [ 7935]: Receiver flow control exceeded timer. 


This happens when sending to some receivers and for some reason the data 
that the receiver gets is unintelligible.  The fact that you had to 
retransmit frame 0 so many times makes things even more suspicious.

Anyway, fix the flow control problem and then see how things go.

Lee.


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