PT91377A - Sistema de seguranca na transmissao de telecomunicacoes - Google Patents

Sistema de seguranca na transmissao de telecomunicacoes Download PDF

Info

Publication number
PT91377A
PT91377A PT91377A PT9137789A PT91377A PT 91377 A PT91377 A PT 91377A PT 91377 A PT91377 A PT 91377A PT 9137789 A PT9137789 A PT 9137789A PT 91377 A PT91377 A PT 91377A
Authority
PT
Portugal
Prior art keywords
transmission
path
circuit
security system
circuit element
Prior art date
Application number
PT91377A
Other languages
English (en)
Portuguese (pt)
Inventor
Geoffrey Chopping
Jonathan William Rowe
Original Assignee
Plessey Telecomm
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plessey Telecomm filed Critical Plessey Telecomm
Publication of PT91377A publication Critical patent/PT91377A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
    • H04J3/085—Intermediate station arrangements, e.g. for branching, for tapping-off for ring networks, e.g. SDH/SONET rings, self-healing rings, meashed SDH/SONET networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
PT91377A 1988-08-16 1989-08-03 Sistema de seguranca na transmissao de telecomunicacoes PT91377A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8819470A GB2222055B (en) 1988-08-16 1988-08-16 Telecommunications transmission security arrangement

Publications (1)

Publication Number Publication Date
PT91377A true PT91377A (pt) 1990-03-08

Family

ID=10642218

Family Applications (1)

Application Number Title Priority Date Filing Date
PT91377A PT91377A (pt) 1988-08-16 1989-08-03 Sistema de seguranca na transmissao de telecomunicacoes

Country Status (12)

Country Link
US (1) US5091902A (h)
EP (1) EP0359352B1 (h)
JP (1) JPH0276428A (h)
KR (1) KR900004128A (h)
CN (1) CN1018227B (h)
DE (1) DE68929085T2 (h)
DK (1) DK402389A (h)
ES (1) ES2136592T3 (h)
FI (1) FI893848A7 (h)
GB (1) GB2222055B (h)
IN (1) IN172258B (h)
PT (1) PT91377A (h)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9010603D0 (en) * 1990-05-11 1990-07-04 Int Computers Ltd Access control in a distributed computer system
JP2663687B2 (ja) * 1990-07-27 1997-10-15 日本電気株式会社 デュアルリング網におけるａｔｍ通信方式
GB2253973B (en) * 1991-03-22 1995-06-07 Plessey Telecomm Multiplex data ring transmission
US5740157A (en) * 1992-05-21 1998-04-14 Alcatel Network Systems, Inc. Distributed control methodology and mechanism for implementing automatic protection switching
US5454025A (en) * 1992-11-12 1995-09-26 Mulrow; Robert J. Switch bypass for a public safety calling system
CA2107755C (en) * 1992-11-16 1998-07-07 Paul Elliott Janssen Telecommunication system with improved reconfiguration flexibility
DE4331577C2 (de) * 1993-09-16 1995-12-07 Siemens Ag Verfahren und Schaltungsanordnung zum Übertragen von Nachrichtenzellen über redundante virtuelle Pfadpaare eines ATM-Kommunikationsnetzes
US5436886A (en) * 1994-07-14 1995-07-25 Northern Telecom Limited ATM switch in dual switch plane operation
US5731887A (en) * 1995-12-22 1998-03-24 Mci Communications Corporation System and method for photonic facility and line protection switching
US5777761A (en) * 1995-12-22 1998-07-07 Mci Communications Corporation System and method for photonic facility and line protection switching using wavelength translation
US6005694A (en) * 1995-12-28 1999-12-21 Mci Worldcom, Inc. Method and system for detecting optical faults within the optical domain of a fiber communication network
US6285475B1 (en) 1995-12-29 2001-09-04 Mci Communications Corporation Method and system for detecting optical faults in a network fiber link
US6108113A (en) * 1995-12-29 2000-08-22 Mci Communications Corporation Method and system for transporting ancillary network data
US5884017A (en) * 1995-12-29 1999-03-16 Mci Communications Corporation Method and system for optical restoration tributary switching in a fiber network
US5903370A (en) * 1996-06-28 1999-05-11 Mci Communications Corporation System for an optical domain
JP3531526B2 (ja) * 1999-05-13 2004-05-31 日本電気株式会社 通信システム
US6914878B1 (en) 2000-10-16 2005-07-05 Telefonaktiebolaget Lm Ericsson (Publ) Fault detection in multi-plane switch
JP4562900B2 (ja) * 2000-11-30 2010-10-13 パナソニック株式会社 伝送装置および遠隔制御システム
EP2621135B1 (en) * 2012-01-24 2018-06-13 ADVA Optical Networking SE A method and a system for providing a flexible secondary data path

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5412766B2 (h) * 1971-11-24 1979-05-25
US4076961A (en) * 1974-09-23 1978-02-28 Intertel, Inc. Automatic switching unit for data communications network
JPS55136742A (en) * 1979-04-13 1980-10-24 Toshiba Corp Multiplex communication system
US4385392A (en) * 1981-07-31 1983-05-24 Angell Gary W Modem fault detector and corrector system
AU552312B2 (en) * 1982-02-08 1986-05-29 Racal-Milgo Limited Communication system
US4633246A (en) * 1984-01-09 1986-12-30 Fiberlan, Inc. Time divison multiplex ring
GB2165412B (en) * 1984-10-05 1988-08-10 Stc Plc Improvements in optical transmission systems
US4694492A (en) * 1984-11-09 1987-09-15 Pirmasafe, Inc. Computer communications security control system
CA1261021A (en) * 1985-03-12 1989-09-26 Harutada Ohya Multiplex transmission system
US4648088A (en) * 1985-08-19 1987-03-03 Rockwell International Corporation Distributed control time division multiplex ring communication apparatus
US4680771A (en) * 1985-12-31 1987-07-14 Amada Engineering Service Co., Inc. Mirror adjustment device in laser oscillator

Also Published As

Publication number Publication date
DK402389A (da) 1990-02-17
DE68929085T2 (de) 2000-02-03
GB8819470D0 (en) 1988-09-21
JPH0276428A (ja) 1990-03-15
GB2222055B (en) 1992-10-28
EP0359352B1 (en) 1999-10-13
KR900004128A (ko) 1990-03-27
FI893848A0 (fi) 1989-08-15
CN1040468A (zh) 1990-03-14
EP0359352A2 (en) 1990-03-21
EP0359352A3 (en) 1992-08-26
GB2222055A (en) 1990-02-21
IN172258B (h) 1993-05-22
US5091902A (en) 1992-02-25
ES2136592T3 (es) 1999-12-01
DE68929085D1 (de) 1999-11-18
CN1018227B (zh) 1992-09-09
FI893848A7 (fi) 1990-02-17
DK402389D0 (da) 1989-08-16

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Legal Events

Date Code Title Description
FC3A Refusal

Effective date: 19951124