-
公开(公告)号：EP0359352A3
公开(公告)日：1992-08-26
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.
-
公开(公告)号：EP0460835A2
公开(公告)日：1991-12-11
申请号：EP91304709.8
申请日：1991-05-24
申请人： GPT LIMITED
CPC分类号： H04J3/0685 , H04J3/0623
摘要： The invention concerns a method of pointer processing a digital TDM data stream at a node of a synchronous SDH transmission network so as to justify the data stream on transmission, the data stream having a specified line frequency and being composed of frames, each frame containing a reference word, and the node of the transmission network having a node frequency, the method comprising storing the incoming data stream in a buffer store at the node, using the line reference of the incoming data stream to extract a data pointer from the data stream for each frame, which data pointer indicates the location of the reference word of that frame in the buffer store, and characterised in that a timing pointer is extracted from the incoming data stream utilising the line reference and a line clock the frequency of which is a multiple of the line reference; the timing pointer so extracted is converted into a reference value by utilising the node reference and a node clock; the reference value is utilised to generate a node timing pointer; the node timing pointer is compared with a read address and data pointer; and read-out from the buffer store is justified in accordance with the results of the comparison.
摘要翻译： 本发明涉及一种在同步SDH传输网络的节点上指针处理数字TDM数据流的方法，以便在发送时证明数据流，数据流具有指定的线路频率并由帧组成，每个帧包含一个 参考字和具有节点频率的传输网络的节点，该方法包括使用输入数据流的线路引用将输入数据流存储在节点的缓冲存储器中，以从数据流中提取数据指针 每个帧，哪个数据指针指示该帧在缓冲存储器中的参考字的位置，并且其特征在于，使用线路参考从输入数据流中提取定时指针，频率为多个的线路时钟 的线参考; 所提取的定时指针通过利用节点参考和节点时钟被转换成参考值; 该参考值用于生成节点定时指针; 将节点定时指针与读地址和数据指针进行比较; 并且从缓冲存储器读出根据比较的结果是合理的。
-
公开(公告)号：EP0279503A2
公开(公告)日：1988-08-24
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.
摘要翻译： 在其中组合了二十二兆比特/秒信令流的四十兆比特每秒的TDM信令系统中，二十个主要信令流中的一个被反转并替代其它信令流之一。 通过使用相邻信道，40兆比特信号流具有至少每二十位一次的数据的保证改变。 该系统便于采用双相标记编码数据的设备中的时钟恢复和同步。
-
公开(公告)号：EP0818902A2
公开(公告)日：1998-01-14
申请号：EP97304383.9
申请日：1997-06-23
申请人： GPT LIMITED
CPC分类号： H04J14/0227 , H04J14/0241 , H04J14/0278 , H04J14/0282
摘要： A Network has a non-ring architecture and is based on a transmission medium having a broadband electromagnetic spectrum and has a plurality of transmitters, each transmitter being locked to a specific wavelength and transmitting a regular frame sequence of Data Bursts, each Data Burst containing a Preamble and Tributary Identification Number. There is also a plurality of receivers each receiver being tuneable to any of the transmitters and each receiver being tuned in a corresponding definable regular frame sequence to some or all of the transmitters in order to receive the Data Bursts intended for that receiver.
The Network typically uses either optical transmission via a Passive Optical Network (PON), or a radio transmission network.摘要翻译： 网络具有非环形架构，并且基于具有宽带电磁频谱的传输介质并且具有多个发射器，每个发射器被锁定到特定波长并且发射数据突发的常规帧序列，每个数据突发包含 前导码和支路识别号码。 还有多个接收机，每个接收机可调谐到任何发射机，并且每个接收机以相应的可定义的常规帧序列被调谐到一些或全部发射机，以便接收预定给该接收机的数据突发。 网络通常使用通过无源光网络（PON）的光传输或无线传输网络。
-
公开(公告)号：EP0644705A3
公开(公告)日：1997-02-05
申请号：EP94306011.1
申请日：1994-08-15
申请人： GPT LIMITED
IPC分类号： H04Q11/04
CPC分类号： H04Q11/0478
摘要： In a telecommunications system in which narrowband or guiding services already exist, different service rates, either fixed or variable may be required. A further service switch is connected in parallel with the existing narrowband or guiding switch, the further service switch being similarly controlled in response to the guiding signalling.
-
公开(公告)号：EP0558291A3
公开(公告)日：1995-02-15
申请号：EP93301358.3
申请日：1993-02-24
申请人： GPT LIMITED
发明人： Chopping, Geoffrey
CPC分类号： H04Q11/06 , H04J2203/0005 , H04J2203/0012 , H04Q11/0478
摘要： A reconfigurable switch memory which is applicable to time switches and space switches enables two very different time switching functions to be efficiently implemented by one type of switching unit. A reconfigurable switching device is provided which, for instance, can work in either one bit or five bit mode, the granularity of the switch being varied.
-
7.发明公开
公开(公告)号：EP0282229A3
公开(公告)日：1990-02-28
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.
-
公开(公告)号：EP0674407A3
公开(公告)日：1996-01-31
申请号：EP95301872.8
申请日：1995-03-21
申请人： GPT LIMITED
发明人： Chopping, Geoffrey
IPC分类号： H04J3/07
CPC分类号： H04J3/076
摘要： A telecommunications transmission system carries multiple tributary data streams with SDH compatible multiplexing and demultiplexing arrangements that include a tributary justification algorithm utilising both byte and bit justification means as well as a double-ended payload protocol. The byte justification means employs an offset clock with a nominal constant frequency offset from the transmission system clock so that the offset clock can be used to force a regular rate of byte justifications of constant sign. The bit justification means employs the difference between the tributary clock and the offset clock to determine the bit justifications necessary to multiplex the tributary data stream and the bitjustifications are normally of complementary sign to the forced regular byte justifications except where the frequency of the offset clock lies between the frequency of the transmission clock.
-
公开(公告)号：EP0675624A1
公开(公告)日：1995-10-04
申请号：EP95301941.1
申请日：1995-03-23
申请人： GPT LIMITED
发明人： Chopping, Geoffrey
IPC分类号： H04M3/30
CPC分类号： H04M3/303
摘要： A telecommunication network and switching system where digital circuits are supplied to customer terminals for dial-up services and where automatic testing of the access connections to the customer premises is performed whilst calls are not in progress. A loop test unit is provided at the customer's premises near to the customer digital line terminals able to detect a test sequence sent from an exchange when a call is not in progress, the test sequence being recognised by the loop test unit and a test sequence being returned to the exchange to enable the error performance of the link in both directions to be tested.
摘要翻译： 一种电信网络和交换系统，其中数字电路被提供给客户终端用于拨号服务，并且在呼叫未进行的同时执行到客户驻地的接入连接的自动测试。 在客户的房屋附近，在客户数字线路终端处提供环路测试单元，能够检测在呼叫未进行时从交换机发送的测试序列，测试序列由环路测试单元识别，测试序列为 返回到交换机，以使两个方向的链路的错误性能得以测试。
-
公开(公告)号：EP0317055B1
公开(公告)日：1994-11-17
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
-
-
-
-
-
-
-
-
-
搜索结果
30 条记录 (耗时 0.01 秒)
