3
Motivation: The
current
COMMON-ISDN-API specification defines paper formats
ISO A4, ISO B4 and ISO A3 at standard resolution (R8 x 3.85) and high
resolution (R8 x 7.7). Support for B4 and A3 is even optional.
The following document proposes a COMMON-ISDN-API extension
that enables FAX document transmission and reception with paper
formats ISO A4, ISO B4 and ISO A3 and these resolutions as specified
in T.30:
•
R8 x 3.85
•
R8 x 7.7
•
R8 x 15.4
•
R16 x 15.4
•
200 x 200
•
300 x 300
•
400 x 400
The page format and resolution information is passed via appropriate
fields in the SFF page header.
To reduce the additions required in a CAPI application in order to make
use of the extension, the new functionality is added directly to the
existing SFF format. This means that there is a possibility of conflict
with future official extensions of the COMMON-ISDN-API. To prevent
incompatibilities, support for FAX paper formats and resolutions must be
enabled explicitly so as to turn off any future CAPI extension that would
cause incompatibility.
Specifically, it has to be enabled by the application for a designated
controller through a manufacturer request command 9 (Options request)
with bit 6 (Enable FAX paper formats and resolutions) set. It will stay
active until either the application releases the COMMON-ISDN-API or
issues another options request with bit 6 not set.
An application can determine whether the COMMON-ISDN-API
supports FAX paper formats and resolutions by examining the CAPI
profile and searching the manufacturer string for "Eicon" or by
examining the CAPI profile and trying the manufacturer command 9
described below.
Changes since the first version from 12.1.2001:
•
Added support for resolutions 300 x 600, 400 x 800, 600 x 1200, 600
x 600 and 1200 x 1200 dpi.
