Re: [hylafax-users] Frame Number Errors

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2005.01.18 10:56 Adam Engel wrote:
> At 01:38 PM 1/18/2005, Lee Howard wrote:

> > > Jan 18 13:10:40.59: [ 4775]: RECV received frame number 98
> > > Jan 18 13:10:40.77: [ 4775]: RECV received frame number 99

> Just for peace of mind, the messages  RECV received frame number ## 
> ,  are they notifications that a problem is occuring or is this 
> normal for class 1 modems? We had all our modems on class 2, but 
> switched about 10 of them to class 1 over the weekend.

They are happy messages.  They are normal messages seen in Class 1/1.0 
when the session negotiated ECM (error-correction).

With ECM the image data is broken up into "blocks" of 64K and "frames" 
of 256 bytes.  The frames are HDLC-encoded (thus they show up when HDLC 
frames are logged).  The logging of "RECV received frame number ##" is 
just HylaFAX being verbose about what it's doing.  Initially I put that 
logging there for troubleshooting purposes, but then I became very 
accustomed to seeing it there, as that logging tends to indicate the 
general health of the communication from the sender.  So I left it in 
there.  As the frames should normally come in sequential order, it will 
give you a good idea about any problems if you see it skip numbers, 
i.e., 95 skipping to 99 or something like that.

Lee.

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