[특허]Cordless key telephone system for covering multiple service areas having exclusively assigned control channels

Cordless key telephone system for covering multiple service areas having exclusively assigned control channels 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04M-011/00
출원번호	US-0686469 (1991-04-17)
우선권정보	JP-0100617 (1990-04-17); JP-0100618 (1990-04-17)
발명자 / 주소	Hara Toshihiro (Tokyo JPX) Shimura Yukihiro (Tokyo JPX) Kumataka Shinji (Tokyo JPX) Hashimoto Kosuke (Tokyo JPX)
출원인 / 주소	NEC Corporation (Tokyo JPX 03)
인용정보	피인용 횟수 : 23 인용 특허 : 0

초록 ▼

In a cordless key telephone system for covering multiple service areas, access units are divided into groups corresponding respectively to the service areas, the access units of each group being located in the corresponding service area for broadcasting a recurrent sequence of address signals on a two-way radio control channel and carrying speech signals on an assigned two-way telephone channel. The access units of each group has a uniquely assigned control channel different in frequency from the control channel of the other group. Cordless stations are switchable to the control channel of a first group of the access units for detecting an address signal and subsequently switchable to the control channel of the access units of a second group if the address signal is not detected in a first sequence for detecting the addressed signal in a second sequence. A main controller is coupled to a switched telephone network for causing the access units to broadcast the address signals in response to an incoming call from the network and for establishing a connection between the network and one of the cordless stations.

대표청구항 ▼

A cordless key telephone system for covering first and second service areas, wherein a frequency spectrum of radio signals used by said system is equally divided into a plurality of channels of equal bandwidth, comprising: a plurality of access units divided into first and second groups, the access units of the first group being located in the first service area for broadcasting a control signal on a first control channel which is an even-numbered one of said channels and broadcasting a speech signal on a first speech channel which is an odd-numbered one of said channels excluding a second control channel, the access units of the second group being located in the second service area for broadcasting a control signal on said second control channel which is an odd-numbered one of said channels and broadcasting a speech signal on a second speech channel which is an even-numbered one of said channels excluding said first control channel, each of said control signals containing a recurrent sequence of address signals; a plurality of cordless stations switchable to the first control channel for detecting an address signal and subsequently switchable to the second control channel if said address signal is not detected in a first sequence for detecting said addressed signal in a second sequence; and a controller coupled to a switched telephone network for causing said access units of each group to broadcast a control signal in response to an incoming call from said network and establishing a connection between said network and one of said cordless stations via one of said access units.

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Greaney Shaun J. ; Leland Kenneth W., Integrated telecommunication system architecture for wireless and wireline access featuring PACS radio technology.
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Maeda Satoru (Kanagawa JPX) Nonogaki Masaru (Kanagawa JPX) Ishihara Tadao (Kanagawa JPX) Yoshikawa Munehiro (Tokyo JPX), Method for a cordless telephone with division of channels into groups of channels.
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Jacklin William Edward, Personal communications system.
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Rodriguez Manuel, Portable communication unit with discrete allocable blocks of airtime.
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Hillan John G. B., State machines.
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Carlsson Goran,SEX, System and method for load reduction in a mobile communication system and a mobile communication system.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Cordless key telephone system for covering multiple service areas having exclusively assigned control channels 원문보기

초록 ▼

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Cordless key telephone system for covering multiple service areas having exclusively assigned control channels 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (23)

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