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Posted by Laura on September 28, 2006, 6:38 am
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understand that they dont put effort on it.
So regarding all these companies send2fax or jblast ... etc... how can they
send all these big amount of fax so quick?
I was convinced that they would do it over ip..
Laura
>>I would be more interested on wholesale providers...
>> Ive checked the links and Ive checked the ATA systems.. I understand that
>> they digitise the fax signal.
>
> Yes, and that's quite silly if you think about it, because the modem
> inside the fax machine works hard to convert the digitally encoded data to
> analog form...
>
> An ATA can provide one or more ports equivalent to telephone lines ("FXS
> ports") to which you may connect telephone sets; and/or one or more ports
> equivalent to telephone sets ("FXO ports") that can be connected to a
> telephone line.
>
>> But I was thinking on something more like skype.. But maybe Im dreaming
>> too much...
>
> If you just want to send picture from a PC to another PC, all you need is
> a scanner producing an image file that you will then send in one of many
> possible ways: for example, e-mail or Skype-based file transfer. The
> problems begin when you want to send your pictures to actual fax machines
> connected to the PSTN (Public Switched Telephone Network).
>
>> If I have an Broadband line in my house, and 3 computers connected to
>> internet.They could be making 3 skype phone calls, but could they be
>> sending 3 fax at the same time?
>
> Well, IP is a packetized protocol, so you can share the bandwidth among
> multiple independent sessions.
>
>> WOuld this Fax over IP system be faster?, or send various at the same
>> time?
>
> Yes, but more often than not you can't just attach your fax machine(s) to
> FXS ports of an ATA registered to the server of some PSTN termination
> provider, even using uncompressing codecs such as G.711, because the fax
> protocol is very sensitive to latency (propagation delay) and especially
> jitter (random fluctuations of the latency), which on the other hand are
> well tolerated by the human ear. The result is that connections that
> "sound good" to a human may sometimes work for fax transmission, and
> sometimes not... That's why several other mechanisms have been devised to
> send fax messages over IP, ranging from store-and-forward systems such as
> email-to-fax gateways (check out the free service by www.tpc.int ) to the
> T.38 protocol for realtime fax transmission.
>
> My impression is that not much effort is currently spent on fax-over-IP
> because, in the age of Internet, fax technology is increasingly perceived
> as a barbarous relic of the past...
>
> Cheers --
>
> Enzo
>
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