Dialogic Network Device 206-412-06 Manuel de référence - Page 3

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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.