Tellabs, Inc.

Teltrend, Inc.

Richard A Yndestad

Jerry J Kosner, Jr

Charles A Pycha

Peter S Fuss

John A Washburn

Eric P Bergstrom

An improved network interface unit having a substantially smaller width than many prior art network interface units. The network interface unit comprises a single, planar circuit board assembly interconnected between incoming and outgoing telephone lines and incoming and outgoing customer premises lines. Two relays and a controller are mounted on the board. The controller monitors the transmission of data along the lines and, by activating the relays, provides communication and maintenance functions, such as loopback. The network interface unit utilizes a controller made up of (1) a processor-based software control system and (2) an integrally cooperating application specific integrated circuit. The controller may, for example, provide and monitor framing, detect and monitor signals, and convert bipolar data to unipolar data.

High density telephone network interface unit

Equipment cabinet

Growing community of inventors

Naperville, IL, United States of America

Richard A Yndestad