High density telephone network interface unit

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

1997-04-10

1999-05-25

Matar, Ahmad F.

Telephonic communications

Subscriber line or transmission line interface

379324, 379413, H04M 1900

Patent

active

059076143

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: 5521977 (1996-05-01), Bergstrom et al.
patent: 5631956 (1997-05-01), Bergstrom et al.
"Wescom 3552-03 ESF T1 Network Interface Unit (ESF T1 NIU)," Section 355-203-201, Equipment Issue 1, First Printing, Mar. 1992.
"3140-01 High Density (HD) T1 Extension Repeater", Section 3140-01-10, Issue A, Westell, Inc., May 1991.
"Wescom 3552-00 ESF T1 Network Interface Unit (ESF T1 NIU)," Section 355-200-201, Equipment Issue 1, First Printing, Dec. 1990.
"Wescom 3552-01 ESF Network Interface Unit (NIU)," Section 355-201-201, Equipment Issue 1, Third Printing, Jun. 1990.

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