The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Design of a LAPD interface using the T7130 multichannel LAPD controller and the T715A synchronous protocol data formatter
Author:	Walker, Hopeton Saint John
View Online:	njit-etd1995-116 (xv, 63, A74, B29 leaves, [4] pages ~ 6.0 MB pdf)
Department:	Department of Electrical and Computer Engineering
Degree:	Master of Science
Program:	Electrical Engineering
Document Type:	Thesis
Advisory Committee:	Manikopoulos, Constantine N. (Committee chair) Ziavras, Sotirios (Committee member) Robbi, Anthony D. (Committee member)
Date:	1995-01
Keywords:	Data transmission systems.
Availability:	Unrestricted
Abstract:	As the ISDN telecommunications standard gains acceptance, there is an ever increasing need for intelligent interfaces to implement the L2 protocol known as LAPD. The T7130 MLC, the T7115A SPYDER-T and the MC68020 microprocessor were used to design a LAPD Interface that conforms to the LAPD protocol as specified by CCITT. The LAPD Interface utilizes a Shared Memory Array which is attached to the Data Link Processors in a single bus configuration. The SMA Arbitration Control allows access to the SMA on a prioritized basis and was implemented as a state machine using PAL's. L2 drivers and L3 management software were written and used to test the operability of the interface via an emulator. The LAPD Interface was able to terminate 32 I-IDLC channels configured for LAPD operation with an average throughput of 942.42 messages per second. The LAPD Interface was also able to operate efficiently in an environment in which random errors of the order of 1E-6 were injected.