Re: [hylafax-users] "ERR No carrier detected"

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Dagg wrote:
> Now, if someone could explain why in Class 1, my hylafax installation
> can "hear" the called fax, and not in class 1.0, it would be great !
>   

The difference between Class 1 and Class 1.0 in the case of the 
MT5634ZPX is V.34-Fax support.  When using V.34-Fax the initial 
handshaking is done differently.  In V.34 it is done with V.8 and with 
non-V.34 it is done with V.21 signaling.

It is entirely possible that when attempting V.8 handshaking something 
went wrong (probably on the part of the ZPX modem) or happened 
unexpectedly and thus throws up the "NO CARRIER" result.

I'd suggest making sure that your 5634ZPX has the latest firmware.  If 
the problem exists with the latest firmware then I'd suggest contacting 
Multitech about it.  As Agere (now LSI) has discontinued the Venus 
chipset (which is on the 5634ZPX) I'm not sure how likely a solution 
would be forthcoming.  Realize that the Venus was the first popular fax 
modem chipset to support V.34-Fax.  LSI has succeeded the Venus with the 
CFAX34 chipset which you can find on the Mainpine IQ Express cards, and 
its quite possible that the problem does not exist with those... and if 
it does, then Mainpine and LSI are likely able to resolve it.

In these cases, as a workaround, you could use JobControl to enable 
Class 1 when faxing to the troublesome destinations.

Thanks,

Lee.


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