ISDN Q.921 (LAPD)


Overview:-	The purpose of this project is to provide an ISDN Q.921 LAPD multiplexing driver that will link HDLC CDI streams and provide D-Channel signalling services to the ISDN Q.931 Call Control driver. The driver will perform automatic User-side TEI requests and allocation, and will pass Network-side TEI allocation requests up to the Layer 3 protocol. The driver will provide SAPI 0 (LAPD) D-Channel signalling as well as SAPI 16 (LAPB) D-Channel packet.

History:-	This project was started January 2003.

Status:-	This project is in the Testing stage.

Dependencies:-	This project depends on the HDLC project.

References:-	See ITU-T Recommendation Q.921.

Design:-	The design consists of a Data Link Provider Interface, dlpi(7), that provides LAPD data link services. HDLC streams providing the Communications Device Interface, cdi(7), can be linked under the module and configured using IO controls. A detailed design has not yet been released.

Code:-	Code can be found in the dl sub-directory of the strss7 release code.

Documentation:-	A manual page for the lapd driver can be found here: lapd(4).

Test Results:-	The driver will be tested to ITU-T Recommendation Q.921bis. Preliminary PICS/PIXIT have not yet been released. Test results have not yet been released.

Release Package:-	This driver will be relased in the next major release (0.8.4) of the strss7 package.

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