LAPD protocol implementation available

Alfons Mittelmeyer <>
Wed Aug 30 12:07:15 CEST 2006

Vance Shipley <vances <at>> writes:

> Folks,
> In a project last year I found I needed a LAPD protocol implementation
> which provided an API to the Unacknowledged Information (UI) frame
> service.  I wasn't able to find an existing implementation which exposed
> the UI service to the user.  So to complete the project I implemented
> my own version of the Link Access Procedures on the D-channel (LAPD) as
> documented in ITU-T Q.921.  I did this to create an emulation environment
> for GSM Abis interfaces.  This was work done simply in order to have a
> testing environment for another commercial product we developed.
> I am making this Erlang application available under a BSD opensource
> license.  I'm not sure how likely it is that anyone will have a use for
> this but I might as well share.  If nothing else the design documented 
> in the User Guide might might be interesting for those building such 
> communicating state machine applications.
> 	-Vance

Dear Vance,

I am interested in your implementation of the LAPD protocol, but the URLs

don't exist anymore.
Can you offer an alternate internet address where your implementation may be 

best regards

- Alfons

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