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| -rw-r--r-- | Documentation/isdn/INTERFACE.fax | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/Documentation/isdn/INTERFACE.fax b/Documentation/isdn/INTERFACE.fax new file mode 100644 index 000000000..9c8c6d914 --- /dev/null +++ b/Documentation/isdn/INTERFACE.fax @@ -0,0 +1,163 @@ +$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 + |