Channel interface unit

Telephonic communications – Subscriber line or transmission line interface

Patent

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Details

379344, 379398, 379404, 379413, 379 37, H04M 1104

Patent

active

055576729

ABSTRACT:
A channel interface unit for interconnecting a two-wire transmission path which transmits analog signals and a digital signal transmission path. The channel interface unit includes a digital interface unit coupled with the digital signal transmission path and producing digital signals based on digital signals received from the digital signal transmission path, a converter for converting the digital signals to analog signals, a filter for removing noise, produced by the converter, from the analog signals, a driver, coupled with the two-wire transmission path, for amplifying the filtered analog signals, and a power supply for providing regulated voltage to the driver.

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"MCU-4200 D4/SLC-96 Metallic Channel Unit (For Alarm CKTS.)", Operation and Installation Practice Manual, Practice Section TLGD-4200, Tollgrade Communications, Inc. (Jan. 1992) pp. 1-7.
"MCU-4496 SLC-96 Metallic Channel Unit", Draft Operation and Installation Practice Manual, Practice Section TLGD-MCU-4496, Rev A, Tollgrade Communications, Inc. (Jul. 1990), pp. 1-6.
"MCU-4200 D4/SLC-96 Metallic Channel Unit", Draft Operation and Installation Practice Manual, Practice Section TLGD-MCU-4200, Rev A, Tollgrade Communications, Inc. (Jul., 1990), pp. 1-11.
"Tollgrade Communications MCU-4400 D4 Metallic Channel Unit", Draft Operation and Installation Practice Manual, Practice Section TLGD-MCU-4400, Rev. A (Jul., 1990), pp. 1-8.

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