ISDN Q.921 Link Access Procedure D Channel (LAPD)
Description: OpenSS7 Product Status ISDN LAPD
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| Overview:- |
This product provides an ISDN Q.921 LAPD multiplexing driver that links
HDLC CDI streams and provide D-Channel signalling services to the ISDN Q.931 Call Control
driver. The driver performs automatic User-side TEI requests and allocation, and passes
Network-side TEI allocation requests up to the Layer 3 protocol.
The driver provides SAPI 0 (LAPD) D-Channel signalling as well as SAPI 16 (LAPB) D-Channel
packet.
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| History:- |
This product was started January 2003.
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| Status:- |
This product is in the Testing stage.
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| Dependencies:- |
This product depends on the HDLC product.
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| 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.
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| Documentation:- |
A manual page for the lapd driver can be found here: lapd(4).
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| 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.
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| References:- |
See ITU-T Recommendation Q.921.
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| Code:- |
Code can be found in the dl sub-directory of the
strss7 release code.
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| Release Package:- |
This driver will be released in the next major release (0.8.4) of the strss7
package.
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