High density telephone network interface unit

Details High density telephone network interface unit High density telephone network interface unit

1993-10-29

1996-05-28

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

379324, 379413, H04M 1900

Patent

active

055219772

ABSTRACT:
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.

REFERENCES:
patent: 5026291 (1991-06-01), David
patent: 5315644 (1994-05-01), Lester et al.
patent: 5323461 (1994-06-01), Rosenbaum et al.

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