Document Type


Date of Award

Fall 1-31-1995

Degree Name

Master of Science in Electrical Engineering - (M.S.)


Electrical and Computer Engineering

First Advisor

Constantine N. Manikopoulos

Second Advisor

Sotirios Ziavras

Third Advisor

Anthony D. Robbi


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.