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+$Id: INTERFACE.fax,v 1.2 2000/08/06 09:22:50 armin Exp $
+
+
+Description of the fax-subinterface between linklevel and hardwarelevel of
+ isdn4linux.
+
+ The communication between linklevel (LL) and hardwarelevel (HL) for fax
+ is based on the struct T30_s (defined in isdnif.h).
+ This struct is allocated in the LL.
+ In order to use fax, the LL provides the pointer to this struct with the
+ command ISDN_CMD_SETL3 (parm.fax). This pointer expires in case of hangup
+ and when a new channel to a new connection is assigned.
+
+
+Data handling:
+ In send-mode the HL-driver has to handle the <DLE> codes and the bit-order
+ conversion by itself.
+ In receive-mode the LL-driver takes care of the bit-order conversion
+ (specified by +FBOR)
+
+Structure T30_s description:
+
+ This structure stores the values (set by AT-commands), the remote-
+ capability-values and the command-codes between LL and HL.
+
+ If the HL-driver receives ISDN_CMD_FAXCMD, all needed information
+ is in this struct set by the LL.
+ To signal information to the LL, the HL-driver has to set the
+ parameters and use ISDN_STAT_FAXIND.
+ (Please refer to INTERFACE)
+
+Structure T30_s:
+
+ All members are 8-bit unsigned (__u8)
+
+ - resolution
+ - rate
+ - width
+ - length
+ - compression
+ - ecm
+ - binary
+ - scantime
+ - id[]
+ Local faxmachine's parameters, set by +FDIS, +FDCS, +FLID, ...
+
+ - r_resolution
+ - r_rate
+ - r_width
+ - r_length
+ - r_compression
+ - r_ecm
+ - r_binary
+ - r_scantime
+ - r_id[]
+ Remote faxmachine's parameters. To be set by HL-driver.
+
+ - phase
+ Defines the actual state of fax connection. Set by HL or LL
+ depending on progress and type of connection.
+ If the phase changes because of an AT command, the LL driver
+ changes this value. Otherwise the HL-driver takes care of it, but
+ only necessary on call establishment (from IDLE to PHASE_A).
+ (one of the constants ISDN_FAX_PHASE_[IDLE,A,B,C,D,E])
+
+ - direction
+ Defines outgoing/send or incoming/receive connection.
+ (ISDN_TTY_FAX_CONN_[IN,OUT])
+
+ - code
+ Commands from LL to HL; possible constants :
+ ISDN_TTY_FAX_DR signals +FDR command to HL
+
+ ISDN_TTY_FAX_DT signals +FDT command to HL
+
+ ISDN_TTY_FAX_ET signals +FET command to HL
+
+
+ Other than that the "code" is set with the hangup-code value at
+ the end of connection for the +FHNG message.
+
+ - r_code
+ Commands from HL to LL; possible constants :
+ ISDN_TTY_FAX_CFR output of +FCFR message.
+
+ ISDN_TTY_FAX_RID output of remote ID set in r_id[]
+ (+FCSI/+FTSI on send/receive)
+
+ ISDN_TTY_FAX_DCS output of +FDCS and CONNECT message,
+ switching to phase C.
+
+ ISDN_TTY_FAX_ET signals end of data,
+ switching to phase D.
+
+ ISDN_TTY_FAX_FCON signals the established, outgoing connection,
+ switching to phase B.
+
+ ISDN_TTY_FAX_FCON_I signals the established, incoming connection,
+ switching to phase B.
+
+ ISDN_TTY_FAX_DIS output of +FDIS message and values.
+
+ ISDN_TTY_FAX_SENT signals that all data has been sent
+ and <DLE><ETX> is acknowledged,
+ OK message will be sent.
+
+ ISDN_TTY_FAX_PTS signals a msg-confirmation (page sent successful),
+ depending on fet value:
+ 0: output OK message (more pages follow)
+ 1: switching to phase B (next document)
+
+ ISDN_TTY_FAX_TRAIN_OK output of +FDCS and OK message (for receive mode).
+
+ ISDN_TTY_FAX_EOP signals end of data in receive mode,
+ switching to phase D.
+
+ ISDN_TTY_FAX_HNG output of the +FHNG and value set by code and
+ OK message, switching to phase E.
+
+
+ - badlin
+ Value of +FBADLIN
+
+ - badmul
+ Value of +FBADMUL
+
+ - bor
+ Value of +FBOR
+
+ - fet
+ Value of +FET command in send-mode.
+ Set by HL in receive-mode for +FET message.
+
+ - pollid[]
+ ID-string, set by +FCIG
+
+ - cq
+ Value of +FCQ
+
+ - cr
+ Value of +FCR
+
+ - ctcrty
+ Value of +FCTCRTY
+
+ - minsp
+ Value of +FMINSP
+
+ - phcto
+ Value of +FPHCTO
+
+ - rel
+ Value of +FREL
+
+ - nbc
+ Value of +FNBC (0,1)
+ (+FNBC is not a known class 2 fax command, I added this to change the
+ automatic "best capabilities" connection in the eicon HL-driver)
+
+
+Armin
+mac@melware.de
+