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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
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