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