The Capi Drivers; The Capi 1.1 Driver - ELSA MicroLink ISDN/PCC-16 User Manual

C

The CAPI Drivers

The CAPI interface ( Common ISDN Application Programming Interface ) is a standardized software
interface between ISDN adapters and ISDN application software. As this interface is completely
handled by the application software, its details need not be explained (unlike the AT command
interface described elsewhere in this manual).
NOTE
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The CAPI 1.1 Driver

Implementation
details
CAPI error codes
MicroLink ISDN/PCC-16 Manual © 1997 ELSA GmbH
A detailed documentation of the CAPI-Interface can be downloaded from the
ELSA ONLINE Support BBS (see page 42 for ISDN/modem numbers) or from
the ELSA forum in CompuServe. The following section only describes some
specific details of this implementation.
The supplied CAPI 1.1 drivers support CAPI version 1.1, profile A, release date
September 07, 1990, with the following limits:
Two input buffers for request and responses with 384 bytes each.
n
Both B channels can be used simultaneously and independent of one-
n
another for ISDN communications, not only within a single application
but also by different applications.
One B3 connection (NCCI) can be established per B channel (PLCI).
n
Up to 64 B3 data buffers (per data direction) can be requested.
n
Up to 8 applications can be registered simultaneously.
n
Up to 64 received messages per application.
n
n
Up to 24 Tx/24 Rx buffers per B3 connection.
Up to 2051 bytes per B3 data buffer.
n
1)
If more B3 data buffers are specified in the installation, this maximum value is
used instead.
The following additional error codes have been implemented:
31FFh No more connection possible for this application
32FEh No more B3 connection available
32FFh No more B channel available
Appendix: The CAPI Drivers
1)
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