[특허]Digital loop transceiver for interfacing a digital PABX to a digital subscriber set via a subscriber line

[미국특허] Digital loop transceiver for interfacing a digital PABX to a digital subscriber set via a subscriber line 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-003/00 H04M-009/06
출원번호	US-0334412 (1981-12-24)
발명자 / 주소	Wurzburg Henry (Round Rock TX) Kelley Stephen H. (Austin TX)
출원인 / 주소	Motorola, Inc. (Schaumburg IL 02)
인용정보	피인용 횟수 : 46 인용 특허 : 3

초록 ▼

In a digital telephone system, a digital private automatic branch exchange (PABX) has a plurality of digital line cards for coupling the PABX to respective digital subscriber sets via subscriber lines. In each digital line card, a digital loop transceiver operates in a master mode to couple the digital data bus of the PABX to the subscriber line via a subscriber line interface circuit in response to control signals provided by the PABX on the control bus thereof. In each digital subscriber set, a digital loop transceiver operates in a slave mode to couple the subscriber set to the subscriber line via a subscriber line interface circuit and to provide the several control signals required by the other components thereof. The digital loop transceivers provide communication on each of two communication channels, with the digital data words of the first channel being treated the same as the digital data words of the second channel.

대표청구항 ▼

A digital loop transceiver circuit for providing duplex communication of digital data words on first and second channels and a signalling bit associated with each of said first and second channels, between a duplex subscriber line and a digital I/O port, the transceiver circuit comprising: receiver means for successively receiving a first and a second of said digital data words and of said signalling bits in synchronization with a receive data clock, said first digital data word and the respective signalling bit being received from said digital I/O port in response to a first channel receive enable signal, and said second digital data word and the respective signalling bit being received from said digital I/O port in response to a second channel receive enable signal; modulation means for serially modulating said first and second digital data words and the respective signalling bits for transmission via a first portion of said subscriber line; sync detection means for detecting a modulated signal on a second portion of said subscriber line, and providing a valid sync signal in response to said detection; demodulation means for serially demodulating, in response to said valid sync signal, a third and a fourth of said digital data words and of said signalling bits received via said second portion of said subscriber line; and transmitter means for transmitting said third and fourth digital data words and the respective signalling bits in synchronization with a transmit data clock, said third digital data word being transmitted to said digital I/O port in response to a first channel transmit enable signal, and said fourth digital data word being transmitted to said digital data port in response to a second channel transmit enable signal.

이 특허에 인용된 특허 (3) 인용/피인용 타임라인 분석

Agricola Manfred (Zeulckerstrasse 10B 6000 Frankfurt 60 DEX) Dietze Klaus (Niedwiesenstr. 25a 6000 Frankfurt 50 DEX) Mayr-Stein Horst (Spiessfeldstr. 1 6382 Friedrichsdorf DEX) Reimer Karl-Heinz (Bra, Circuit arrangement for telecommunications especially telephone installations that switch through digitally by time divi.
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Wintzer Klaus (Munich DEX), Circuit arrangement for the transmission of digital signals between subscriber stations of a time multiplex telecommunic.
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Sarma Bhupendra Nath (72 Scales Road London ; N.17 EN), Digital private automatic branch exchange.
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이 특허를 인용한 특허 (46) 인용/피인용 타임라인 분석

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Shumway Jerry L. (Rockville MD), Multi-line accumulator/multiplexer.
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Anderson Gary B. ; Petch Bryan K. ; Peterson Peter O. ; Jensen Ryan N. ; Gavette Sherman, Wireless communication system and method.
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연합인증

[미국특허] Digital loop transceiver for interfacing a digital PABX to a digital subscriber set via a subscriber line 원문보기

초록 ▼

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연구과제 타임라인

이 특허에 인용된 특허 (3) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (46) 인용/피인용 타임라인 분석

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[미국특허] Digital loop transceiver for interfacing a digital PABX to a digital subscriber set via a subscriber line 원문보기

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대표청구항 ▼

연구과제 타임라인

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이 특허에 인용된 특허 (3) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (46) 인용/피인용 타임라인 분석

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