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Reliable data transfer between application and Dialogic® Diva® Media Board
Dialogic
®
Diva
®
Media Boards provide a high-performance block-oriented IDI (ISDN Direct Interface) between
the board hardware and the host CPU. The data transfer is performed via a BUS master DMA. This enables a
reliable data transfer between the host CPU and the Diva Media Board memory that is not affected by the host
CPU load. At the same time, using the BUS master DMA reduces the host CPU load.
The Dialogic
®
Diva
®
TTY interface does not perform data processing. It is only used to forward the data stream
between the application and the IDI interface, i.e., the virtual or emulated TTY interface. The entire data
processing is performed on the RISC CPU of the Diva Media Board. The reliability of the data stream is ensured
by the board hardware through buffering (up to 64 Kbytes for every channel) and block-oriented data transfer
(blocks of up to 2 Kbytes) via the BUS master DMA.
Automatic T.30 protocol parameter adjustment
The FAX CLASS 2 application can ignore low-level T.30 protocol settings. The T.30 protocol stack that runs on
the RISC CPU of the Dialogic
®
Diva
®
Media Board is able to perform the required adjustment of transmission
parameters to provide reliable and fast document transmission without requiring application intervention.
You can overrule the automatic T.30 protocol parameter adjustment with FAX CLASS 2 commands. If your
application does not support the appropriate command set or the required features are not part of the
FAX CLASS 2 command set, you can use Global fax configuration options on page 44 or Global Dialogic®
Diva® TTY configuration options on page 73 to overrule the automatic parameter adjustment.
Support for SEP/SUB/PWD
SEP/SUB/PWD commands are used to address the document recipient and to select or protect the polled
document.
The Dialogic
®
Diva
®
Media Board's support for SEP/SUB/PWD is transparent to the application. The appropriate
features can be activated via Global Dialogic® Diva® TTY configuration options on page 73 without any
application intervention. The received SEP/SUB/PWD frames are delivered to the application via "+FSA:",
"+FPA:", and "+FPW:" indications.