Re: [hylafax-users] Difference in classes

["Y BAESA" <ybaesa@xxxxxxxxxx>]

Title: Difference in classes

Hello,

Here is the table defining the various classes.

 

    User Level                  T4/T6                  T.30                   Physical Lvel

Image Reduc.          Image encoding      FAX session       modem V-protocols

and reproduct.         and decoding           Protocols             data pump  HDLC

<-----------------------DTE------------------------------------------><------------DCE------------>        Class 1

<-------------DTE---------------------------><-----------------DCE-------------------------------->        Class 2.0

<---DTE----><-------------------------DCE--------------------------------------------------------->        Class 3

 

DTE = Data terminal equipment

DCE = Data communication equipment

 

Class 1 Each EIA command begins with the fax extension characters +F Three general forms of command

syntax are available depending on the particular command.

The three forms are capabilties,status and set. Note that not all forms are appropriate for every command

 

+Fcommand=val

whre command represents the parameter to be set and val represents the desired parameter value

 

Class 2

EIA class 2.0 commands have essentially the same syntax as definited for class 1 and all begin with the extension

+F the three general forms of commands syntax (capabilties, status and set) are also available when appropriate.

for class 2.0 the command syntax used to set the value of a parameter or pass  a parameter that controls modem

operation may support numeric or string values Unlike class 1 commands, however, class2.0 numeric constants must

be specified in hexadecimal.

 

Cordialy

Yves

----- Original Message -----

From: Matt Yeager

To: 'HylaFax Users Mailing List (hylafax-users@xxxxxxxxxxx)'

Sent: Monday, November 03, 2003 4:55 PM

Subject: [hylafax-users] Difference in classes

What's the difference exactly between class 1, class 1.0, class 2, class 2.0, and class 2.1 . I've looked around some online, but can't find any definative comparison. Which one is the better one to use for faxing?

                -Matt