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公开(公告)号：EP0279503A3
公开(公告)日：1990-06-27
申请号：EP88300131.5
申请日：1988-01-08
申请人： GPT LIMITED
IPC分类号： H04J3/04
CPC分类号： H04J3/1623 , H04J3/047 , H04L7/0083
摘要： In a forty megabit per second TDM signalling system in which twenty 2 megabit per second signalling streams are combined, one of the twenty primary signalling streams is inverted and substituted for one of the other signalling streams. By using adjacent channels the forty megabit signal stream has a guaranteed change of data at least once every twenty bits. The system facilitates clock recovery and synchronisation in apparatus employing bi-phase mark encoded data.
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公开(公告)号：EP0317055A3
公开(公告)日：1990-03-14
申请号：EP88307864.4
申请日：1988-08-25
申请人： GPT LIMITED
IPC分类号： H04Q11/04
CPC分类号： H04Q11/08
摘要： A telecommunications digital switch for switching channels of time division multiplexed (TDM) signals on a multiplicity of switch input and output paths, the switch comprising:
input and output switching stages and a central switching area:
the input and output switch stages each comprising arrays of DSM (as herein defined);
the central switching area comprising first and second arrays of DMR (as herein defined), wherein the DMR are so preprogrammed with a channel allocation address pattern that all channel routes through the central switching stage experience the same time delay;
the arrangement being such that all or a major part of the channel routes through the switch are constrained to have delays such that all channels are displaced to positions within (n) or (n + 1) subsequent time frames of the TDM system where (n) is an integer, selected from the range 0, 1, 2.-
公开(公告)号：EP0590901A3
公开(公告)日：1995-05-17
申请号：EP93307615.0
申请日：1993-09-24
申请人： GPT LIMITED
IPC分类号： H04Q11/00
CPC分类号： H04Q11/0001 , H04J3/0688 , H04J2203/0089 , H04Q2011/0081
摘要： Coherent optic switching provides an effective solution for broadband switching. Advantageously, the control information should also be transmitted optically. A broadband multiport coherent optic data switch comprises a passive optic combiner/splitter, a plurality of port units and a switch control unit connected thereto, each port unit having a coherent optic source tuned to a respective optic frequency, the output of each source carrying thereon control information, including control information received from the control unit, together with switched data, the outputs of the sources being combined and distributed to all of the plurality of port units.
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公开(公告)号：EP0419019B1
公开(公告)日：1994-11-09
申请号：EP90308558.7
申请日：1990-08-03
申请人： GPT LIMITED
CPC分类号： H04Q11/04 , H04L29/06 , H04L49/30 , H04L49/555
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公开(公告)号：EP0590901A2
公开(公告)日：1994-04-06
申请号：EP93307615.0
申请日：1993-09-24
申请人： GPT LIMITED
IPC分类号： H04Q11/00
CPC分类号： H04Q11/0001 , H04J3/0688 , H04J2203/0089 , H04Q2011/0081
摘要： Coherent optic switching provides an effective solution for broadband switching.
Advantageously, the control information should also be transmitted optically.
A broadband multiport coherent optic data switch comprises a passive optic combiner/splitter, a plurality of port units and a switch control unit connected thereto, each port unit having a coherent optic source tuned to a respective optic frequency, the output of each source carrying thereon control information, including control information received from the control unit, together with switched data, the outputs of the sources being combined and distributed to all of the plurality of port units.摘要翻译： 相干光交换为宽带切换提供了有效的解决方案。 有利地，控制信息也应当被光学地传输。 宽带多端口相干光数据交换机包括无源光学组合器/分离器，多个端口单元和连接到其上的开关控制单元，每个端口单元具有调谐到相应的光学频率的相干光学源，每个源的输出承载在其上 控制信息，包括从控制单元接收的控制信息以及切换的数据，所述源的输出被组合并分配给所述多个端口单元。
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26.发明公开Telecommunications system and method with cyclic redundancy checking means 失效Übertragungsverfahrenund -vorrichtung mit zyklischerBlockprüfung。
公开(公告)号：EP0550169A1
公开(公告)日：1993-07-07
申请号：EP92311219.7
申请日：1992-12-09
申请人： GPT LIMITED
CPC分类号： H04L7/048 , H04J3/0608
摘要： Synchronisation of a receiving termination of a telecommunications system with an incoming data stream is carried out from a synchronisation signal carried with the data stream. It is possible that a "mimic" of the synchronisation signal may occur within the data steam. A system and method as described for detecting current and mimic signals and validating the signals so that correct alignment may be achieved.
摘要翻译： 电信系统的接收终端与输入数据流的同步是从数据流携带的同步信号中进行的。 同步信号的“模拟”可能在数据蒸汽内发生。 所描述的用于检测电流和模拟信号并验证信号以使得可以实现正确对准的系统和方法。
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27.发明公开Telecommunications transmission security arrangement 失效Einrichtung zur sicherenFernmeldeübertragung。
公开(公告)号：EP0359352A2
公开(公告)日：1990-03-21
申请号：EP89303154.2
申请日：1989-03-30
申请人： GPT LIMITED
摘要： The telecommunications transmission security arrangement comprises first and second transmission paths, each having first and second serially connected circuit means. The first circuit means of said first path is arranged to be connectable to the second circuit means of said second path. The first circuit means of the second path is arranged to be connectable to the second circuit means of the first path, and the second circuit means of each path are arranged to monitor alarm conditions of the transmission paths and set up a transmission path by way of the first circuit means of the first path and the second circuit means of the second path when the first path is determined not suitable for transmission. A transmission path is set up by way of the first circuit means of the second path and the second circuit means of the first path when the second path is determined not suitable for transmission.
摘要翻译： 电信传输安全装置包括第一和第二传输路径，每个具有第一和第二串行连接的电路装置。 所述第一路径的第一电路装置被布置成可连接到所述第二路径的第二电路装置。 第二路径的第一电路装置被布置为可连接到第一路径的第二电路装置，并且每个路径的第二电路装置被布置成监视传输路径的报警条件并且通过以下方式建立传输路径： 当确定第一路径不适合于传输时，第一路径的第一电路装置和第二路径的第二电路装置。 当确定第二路径不适于传输时，通过第二路径的第一电路装置和第一路径的第二电路装置建立传输路径。
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公开(公告)号：EP0225756A3
公开(公告)日：1989-04-05
申请号：EP86309084.1
申请日：1986-11-20
申请人： GPT LIMITED
IPC分类号： H04L9/16
CPC分类号： H04L9/0838 , H04L9/0891 , H04L63/0428 , H04Q11/0435 , H04Q2213/13209 , H04Q2213/1333 , H04Q2213/13339
摘要： The telecommunications system includes at least two exchanges and a plurality of user equipments. Each equipment includes a store for holding a user variable data word particular to that user. Each exchange is provided with a store for holding all the user variable data words of the users connected to it, and each exchange is also provided with its own random variable data word. When a first user makes a secure call to a second user, the first user equipment encrypts the call using its particular user variable data word and sends the encrypted data to its own exchange. The exchange decrypts the call using the particular user variable data word and generates the random variable data word that will be used for the call. The exchange encrypts the random variable data word with the particular user variable data word and returns it to the first user. The exchange also sends the random variable data word to the second user's exchange which encrypts it with the user variable data word particular to the second user, and sends it to the second user.
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29.发明公开Synchronisation arrangements for a digital telecommunications exchange system 失效Fernmaneldenanalage的同义词。
公开(公告)号：EP0282229A2
公开(公告)日：1988-09-14
申请号：EP88301843.4
申请日：1988-03-02
申请人： GPT LIMITED
CPC分类号： H04J3/0688 , H04J3/0608
摘要： The synchronisation arrangement includes a waveform and synchronisation information generator to supply synchronisation information for transmission with a data stream over digital switching networks. The synchronisation information includes two different patterns, phased displaced with respect to each other. Interfaces connect peripheral devices to the networks and are adapted to detect and validate the synchronisation information. The checks made are in respect of detecting both patterns, the amount of phase displacement, and the correct sequence. If the synchronisation information is invalid, the detecting interface selects a data stream from another network exclusively for use by the corresponding peripheral device.
摘要翻译： 该同步装置包括波形和同步信息发生器，用于通过数字交换网络提供与数据流进行传输的同步信息。 同步信息包括相对于彼此相位移位的两种不同图案。 接口将外围设备连接到网络，并适用于检测和验证同步信息。 所进行的检查涉及检测两种模式，相位移量和正确序列。 如果同步信息无效，则检测接口从另一个网络中选择专用于相应的外围设备使用的数据流。
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30.发明公开Method of secured communications in a telecommunications system 失效在einemÜbertragung系统中的Verfahren zur gesichertenÜbertragung。
公开(公告)号：EP0225756A2
公开(公告)日：1987-06-16
申请号：EP86309084.1
申请日：1986-11-20
申请人： GPT LIMITED
IPC分类号： H04L9/16
CPC分类号： H04L9/0838 , H04L9/0891 , H04L63/0428 , H04Q11/0435 , H04Q2213/13209 , H04Q2213/1333 , H04Q2213/13339
摘要： The telecommunications system includes at least two exchanges and a plurality of user equipments. Each equipment includes a store for holding a user variable data word particular to that user. Each exchange is provided with a store for holding all the user variable data words of the users connected to it, and each exchange is also provided with its own random variable data word. When a first user makes a secure call to a second user, the first user equipment encrypts the call using its particular user variable data word and sends the encrypted data to its own exchange. The exchange decrypts the call using the particular user variable data word and generates the random variable data word that will be used for the call. The exchange encrypts the random variable data word with the particular user variable data word and returns it to the first user. The exchange also sends the random variable data word to the second user's exchange which encrypts it with the user variable data word particular to the second user, and sends it to the second user.
摘要翻译： 电信系统包括至少两个交换机和多个用户设备。 每个设备包括用于保存该用户特定的用户可变数据字的商店。 每个交换机都设有一个存储器，用于保存与其连接的用户的所有用户可变数据字，并且每个交换机还提供有其自己的随机可变数据字。 当第一用户对第二用户进行安全呼叫时，第一用户设备使用其特定的用户可变数据字加密呼叫，并将加密的数据发送到其自己的交换机。 交换机使用特定用户变量数据字解密呼叫，并生成将用于呼叫的随机变量数据字。 交换机使用特定用户可变数据字加密随机变量数据字并将其返回给第一用户。 交换机也将随机变量数据字发送给第二用户的交换机，用第二用户特定的用户可变数据字进行加密，并将其发送给第二用户。
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