From: Heribert_Otten@k2.maus.de (Heribert Otten)
Newsgroups: comp.dcom.modems
Subject: Re: ZyXEL
Date: 12 Apr 92 21:24:00 GMT
Organization: MausNet
X-Gateway: MausGate/News 1.04

In a message of Do, 09.04.92  rlcarr@animato.uucp wrote:

r>(1) WHERE can they be bought, and HOW much?
r>
r>(2) Can they initiate and respond to retrains both faster and slower?
r>
r>(3) Is the FAX command set documented?

i can't help you on your first questions, but (2) would be interesting to know.

That's what i found for (3) :

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********* The CCITT T.30 Fax Protocol ********

The CCITT T.30 fax protocol describes the G3 fax handshake signals
and procedures. U-1496 takes full control of this protocol, initiates
and terminates fax calls, manages the communication session, and transports
the image data.

Along with T.30, U-1496 provides the highest fax speed of 14400 bps
and will automatically step down to 12000, 9600, 7200, 4800, and 2400 bps if
the line condition is not good enough.

*********  The Fax Command sets ***********

The U1496 series universal modem supports two commend sets for the fax,
the first one is based on the EIA 2388 Class 2 command set and the second
is the Enhanced Fax AT Commands for U1496.


1. The Class 2 Command set

The following Class 2 command sets supported by U1496 are implemented per EIA
2388.(8/20/90)

        AT+FAA        Auto Answer Mode.

        AT+FBOR       Phase C Data Bit Order.

        AT+FCLASS     Service Class Identification and Control.

        AT+FMFR       Identify Manufacture.

        AT+FDCC       Establish DCE Capability.

        AT+FDIS       Current Session Negotiating Position.

        AT+FDCS       Current Session Parameters (Read Only).

        AT+FLID       Local FAX Station ID String, TSI or CSI.

        AT+FCR        Capability to Receive.

        AT+FDR        Begin or Continue Phase C Data Reception.

        AT+FDT        Begin or Continue Sending.

        AT+FET        End the Page or Document.


2. Extended Fax AT Commands

The PC controls the modem through a set of extended fax AT commands
and the modem responds with a set of status report result codes. During
data state, compressed fax image data is flowing between the modem
and PC. The default serial connection speed is 19200 bps and it is
higher than the fax link rate. RTS/CTS hardware flow control is used
to regulate the data flow.

U-1496 provides an extended fax AT command set to set modem mode and
fax parameters. Besides the extended fax AT commands, U-1496 accepts
all the other AT commands described in Chapter 7. For instance, you
can use 'ATD' to make a fax call, or 'ATA' to answer an incoming fax
call.

When Using the Extended Fax AT Commands, you need to send the command
"AT+FCLASS=6" first.

Following are the fax related AT commands:

Mode Setting

      #F              Set the U-1496 into 'ZyXEL FAX' mode, same function as
                        the extended AT command 'AT&N32'.

Parameter Setting

      #V0             Set to normal vertical resolution.
      #V1             Set to high vertical resolution.
      #T0             Set to one dimensional coding scheme.
      #T1             Set to two dimensional coding scheme.
      #R0             Set recording width, 1728 picture elements along a scan
                      line length of 215mm.
      #R1             Set recording width, 2048 picture elements along a scan
                      line length of 255mm.
      #R2             Set recording width, 2432 picture elements along a scan
                      line length of 303mm.
      #L0             Set maximum recording length, A4 (297mm ).
      #L1             Set maximum recording length, B4 ( 364mm ).
      #L2             Set maximum recording length, unlimited.
      #C0             Set minimum scan line time capability at the receiver, 20
                      ms at 3.85 line/mm, T(7.7)=T(3.85).
      #C1             Set minimum scan line time capability at the receiver, 5
                      ms at 3.85 line/mm, T(7.7)=T(3.85).
      #C2             Set minimum scan line time capability at the receiver, 10
                      ms at 3.85 line/mm, T(7.7)=T(3.85).
      #C3             Set minimum scan line time capability at the receiver, 20
                      ms at 3.85 line/mm, T(7.7)=1/2 T(3.85).
      #C4             Set minimum scan line time capability at the receiver, 40
                      ms at 3.85 line/mm, T(7.7)=T(3.85).
      #C5             Set minimum scan line time capability at the receiver, 40
                      ms at 3.85 line/mm, T(7.7)=1/2 T(3.85).
      #C6             Set minimum scan line time capability at the receiver, 10
                      ms at 3.85 line/mm, T(7.7)=1/2 T(3.85).
      #C7             Set minimum scan line time capability at the receiver, 0
                      ms at 3.85 line/mm, T(7.7)=T(3.85).
      #P              Set the local phone number, the phone number following
                      the character 'P' can be up to 25 characters. The modem
                      will exchange this phone number with remote fax machine
                      during initial handshaking.
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Hope that helps.

cu Heribert
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