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公开(公告)号：EP0145983A3
公开(公告)日：1987-09-30
申请号：EP84113918
申请日：1984-11-16
申请人： FUJITSU LIMITED
发明人： Sasaki, Susumu
CPC分类号： H04J3/12 , H04B1/74 , H04B17/0087
摘要： Radio relay equipment for fully digitalized transmission network is disclosed. In the equipment, a received auxiliary signal can be by-passed from receiver (RX) to transmitter (TX) via a by-passing means (7, 8) provided in an auxiliary unit (4) when no additional auxiliary signal is input to the equipment. When an auxiliary signal (B), for example, order wire signal from the telephone equipment, is input, a switching circuit (8) operatively disconnects the by-passing means (7, 8) and switches the line to the additional auxiliary signal. The by-passing means (7, 8) also operates according to a signal regarding failure of the built-in circuit or power supply of the equipment.
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公开(公告)号：EP0094179A3
公开(公告)日：1985-01-30
申请号：EP83302413
申请日：1983-04-28
CPC分类号： G06F11/2007 , G06F11/22 , G06F13/36 , G06F13/4022
摘要： A bus structure for use in a computer network requiring high availability and reliability of communications. Multiple bus paths (2A, 2B) are provided. When a transmission is to be made, under most circumstances the path is selected at random, with all paths being equally probable. Thus, failure of a path is detected quickly. Each host device in the network connects to the bus paths through an interface, or port (1). The task of path selection is carried out by the ports, independently of the host devices. The ports also detect path failures and automatically switch over to an alternate good path upon detection of such a failure, all without host involvement. Virtual circuit communications between hosts are transparent to path selection and switching, so the only indication to a host device of a path failure is a decrease in throughput. Most of the signal processing apparatus of each port (10, 20A, 20B) is shared by the paths, only one path being supported at any given time. Thus, the addition of a second bus path involves only minimal cost.
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公开(公告)号：EP0157412A3
公开(公告)日：1986-07-16
申请号：EP85103983
申请日：1985-04-02
申请人： NEC CORPORATION
发明人： Kunio, Kaneko
IPC分类号： H04B01/74
CPC分类号： H04B1/74
摘要： A radio communication system comprise transmitting and receiving stations, a plurality of transmission channels comprising regular and spare channels linking the stations, and a channel monitor for monitoring the status of the respective channels. When the respective transmission channels are in normal conditions, data signal is transmitted by making use of not only the regular channel but also the spare channel. On the other hand, when a failure of any one of the transmission channels is detected by the channel monitor, data signal subject to band compression is transmitted via the non-failed channel. The communication system thus configured makes it possible to effectively utilize a spare channel for effecting high quality signal transmission, while maintaining the essential function of the spare channel, thus providing an improved utilization of transmission channel.
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公开(公告)号：EP0142138A3
公开(公告)日：1986-03-05
申请号：EP84113522
申请日：1984-11-09
申请人： FUJITSU LIMITED
发明人： Ikeuchi, Satoshi , Taniguchi, Ikuo
CPC分类号： H04B1/74
摘要： @ This invention provides a line protection switching system of which reliability is improved, and the time for protection line switching is decreased. In order to increase the reliability, the service signals are sent in parallel via plurality of transmission lines (11,12 ---), using a service bit area of PCM bit frames. Unlike the prior art system, one embodiment ofthe present system switches a failed transmission line to a stand by line (1n), at a station where it detected a fault before waiting for switching of the opposite station. At the same time the switching command is sent to the opposite station. If the switching of the opposite station fails, the station commands retry of the switching. But if it fails again, the station switches the transmission line to the initial state. Since a low priority signal is transmitted through the stand by line (1n), the total system is economized.
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公开(公告)号：EP0075859A3
公开(公告)日：1984-04-25
申请号：EP82108779
申请日：1982-09-22
申请人： Hitachi, Ltd.
发明人： Arita, Setsuo , Ito, Tetsuo
摘要： The present invention relates to a signal diagnostic method for a triple information tranmission system. According to this method, using a transmission signal transmitted latest among three transmission signals of three channels, the sychronizing signal parts of the respective transmission signals are synchronized so as to align the heads of information signal parts of the transmission signals, whereupon any error in the information signal parts of the transmission signals is detected. The three transmission signals of the three channels are temporarily stored in three registers (28A, 28B, 28C). The storage time intervals of the transmission signals in the registers are determined by the transmission time differences between the respective transmission signals and the latest transmission signal. Upon lapse of the predetermined storage time intervals, the transmission signals are fetched from the respective registers (28A, 28B, 28C).
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公开(公告)号：EP0178109A3
公开(公告)日：1987-05-20
申请号：EP85306986
申请日：1985-10-03
申请人： STC PLC
发明人： Oswald, Thomas
CPC分类号： H04B10/032 , H04B1/74
摘要： In an optical transmission system, particularly a submerged system, a line finding system is provided which, in the event of a fault somewhere along the system, enables the remaining operative lines or paths to take over the traffic and thus "steer around" the fault. The laser sources of the submerged repeaters and switched by electrical selection at their input using failed clock or a supervisory signal to achieve the switching.
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7.发明公开
公开(公告)号：EP0150907A3
公开(公告)日：1986-05-14
申请号：EP85300068
申请日：1985-01-04
发明人： Bell, John Leslie
CPC分类号： H04L12/437
摘要： A method of operating a communication station having two sets of paired input and output terminals which are normally coupled to respective paired sets of terminals in two other stations to form a network includes the steps of: monitoring the input terminal of one set of terminals in the station to detect an idle signal, a delimiter signal, or silence thereon; transmitting the idle signal on the output terminal of the one set if silence is detected by the monitoring step; sending the delimiter signal on the output terminal of the one set if the idle signal is detected by the monitoring step; and coupling internally in the station the input terminal of the one set to an output terminal of the station in a predetermined fashion to permit signals on the input terminal of the one set to pass through the station if the delimiter signal is detected on the input terminal by the monitoring step.
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公开(公告)号：EP0085940A3
公开(公告)日：1986-03-26
申请号：EP83100978
申请日：1983-02-02
申请人： NEC CORPORATION
IPC分类号： H04B17/00 , H04B07/155 , H04B01/74
CPC分类号： H04B7/15542 , H04B1/74 , H04B17/0087
摘要： A service channel signal transmission system in which a service channel signal is constantly fed to at least two radio channels in parallel. Each intermediate repeater station has a service channel demodulator which is constantly connected to either one of the radio channels. A combining and switching circuit automatically switches over the service channel demodulator to the other radio channel in response to an alarm output which indicates an abnormality in a received signal at a receiver associated with the one radio channel. The service channel is completely switched from one to the other without resorting to line switchover control signals from terminal stations.
摘要翻译： 一种服务信道信号传输系统，其中服务信道信号被不断地馈送到并行的至少两个无线电信道。 每个中间中继站具有不断连接到无线电信道之一的服务信道解调器。 组合和切换电路响应于指示在与一个无线电信道相关联的接收机处的接收信号中的异常的报警输出，自动地将服务信道解调切换到另一无线电信道。 服务通道完全从一个切换到另一个，而不需要来自终端站的线路切换控制信号。
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9.发明公开
公开(公告)号：EP0119841A3
公开(公告)日：1985-11-21
申请号：EP84301774
申请日：1984-03-15
申请人： FUJITSU LIMITED
IPC分类号： H04B01/74 , H04B07/185
摘要： In a radundant switchover system for a TDMA satellite communication system for relaying messages from earth station to earth station via a communication satellite, each earth station comprises an initially active TDMA terminal unit (1) and an initially stand-by TDMA terminal unit (2). Determination of loss of transmit burst synchronization in the initially stand-by terminal unit is carried out more than one round trip time period later than the determination of loss of transmit burst synchronization in the initially active terminal unit. Switching of the initially active and stand-by terminal units to the stand-by mode and the active mode, respectively, is effected when loss of transmit burst synchronization is determined in the initially active terminal unit.
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公开(公告)号：EP0140712A3
公开(公告)日：1985-06-05
申请号：EP84307497
申请日：1984-10-31
CPC分类号： H04L12/437
摘要： A data transmission system comprising a plurality of reconfiguring devices (1-6) and a method of reconfiguring such devices is described. Each device (1-6) has a plurality of input and output data links (9-12), the devices being connected in a ring (18) whereby for each reconfiguring device data is received on one data input link (9) and transferred to one data output link (11) such that data may be passed between all the reconfiguring devices along the ring. Each device includes fault recovery means for detecting the pre-I sence of a fault in the ring, the fault recovery means (7) in different devices cooperating to attempt to cause data to be transmitted around a sub-ring when a fault is detected, the sub-ring being constituted at least partially by one or more of the previously unused data links (10, 12) to enable a number of the devices (1-6) to continue to communicate; and merging means (7) for detecting that a new reconfiguring device is connected to at least one pair of previously unused data input and output links and for reconfiguring the ring to include the new device.
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