isdnNCPI(D4isdn)

isdnNCPI -- ISDN Network Control Protocol Information structure

Synopsis

   #include <sys/types.h>
   #include <sys/scoisdn.h>
   
   typedef struct isdnNCPI
   {
       struct
       {
       isdnByte_t  conf;
       isdnByte_t  chanGroup;
       isdnByte_t  chanNumb;
       isdnByte_t  packet_bytes[MAX_PACKET_BYTES]; /* X.25 PLP packet */
       } P123;                     /* bytes after type */
       struct
       {
       isdnWord_t  rate;
       isdnWord_t  resolution;
       isdnWord_t  format;
       isdnWord_t  pages;
       struct
       {
           void    *dummy;
       } recvdID;  /* ID of remote side */
       } FAX;
   } isdnNCPI_t;

Description

The isdnNCPI structure provides additional protocol-specific information.

This structure is used by:

ISDN_CONNECT_B3.ISDN_REQ(D7isdn)
ISDN_CONNECT_B3.ISDN_IND(D7isdn)
ISDN_CONNECT_B3.ISDN_RESP(D7isdn)
ISDN_CONNECT_B3_ACTIVE.ISDN_IND(D7isdn)
ISDN_CONNECT_B3_T90_ACTIVE.ISDN_IND(D7isdn)
ISDN_DISCONNECT_B3.ISDN_REQ(D7isdn)
ISDN_DISCONNECT_B3.ISDN_IND(D7isdn)
ISDN_RESET_B3.ISDN_REQ(D7isdn)
ISDN_RESET_B3.ISDN_IND(D7isdn)

Parameters

For the layer 3 protocols ISO 8028 and X.25, the parameter data are coded:

conf

Bit field:

0: enable the usage of the delivery confirmation procedure in call set-up and data packets (D-Bit)
1..7: reserved

chanGroup

logical channel group number of the permanent virtual circuit (PVC to be used. In the case of virtual calls (VC), this number must be set to 0.

chanNumb

logical channel group number of the permanent virtual circuit (PVC to be used. In the case of virtual calls (VC), this number must be set to 0.

packet_bytes

bytes following the packet type identifier field in the X.25 PLP packets

For layer 3 protocol T.30 (fax group 3), the parameter data are valid only for ISDN_DISCONNECT_B3.ISDN_IND(D7isdn) (for other messages, the structure is empty) and are coded:

rate

actual bit rate used, coded as an unsigned integer value

resolution

0: standard
1: high

format

0: SFF (Structured Fax File); default
1: plain fax format (modified Huffman coding)
2: PCX
3: DCX
4: TIFF (Tagged Image File Format)
5: ASCII
6: Extended ANSI
7: binary file transfer

recvdID

ID of the remote side

References

Intro(D4isdn), Intro(D7isdn)

``SCO ISDN adapter drivers'' in Developing MDI network adapter drivers.