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41. 发明申请

WO1995026600A3 MULTIPURPOSE SYNCHRONOUS SWITCH ARCHITECTURE 审中-公开
公开(公告)号：WO1995026600A3
公开(公告)日：1995-10-05
申请号：PCT/GB1995000661
申请日：1995-03-23
申请人： GPT LIMITED , CHOPPING, Geoffrey
发明人： GPT LIMITED
IPC分类号： H04L12/56

42. 发明申请

WO1995013674A1 DISCRETE MULTIPLE TONE TRANSMISSION ON HIGH-SPEED DIGITAL SUBSCRIBER LINES 审中-公开
标题翻译：高速数字用户线上的多重音频传输
公开(公告)号：WO1995013674A1
公开(公告)日：1995-05-18
申请号：PCT/GB1994002492
申请日：1994-11-11
申请人： GPT LIMITED
发明人： GPT LIMITED , CHALMERS, David, Christopher , CLAYTON, Frederick, Michael
IPC分类号： H04L05/14
CPC分类号： H04L27/2602 , H04L5/023 , H04L5/143
摘要： A communications system employs a high-speed digital link with discrete multiple tone (DMT) wherein the outward paths from a central transmitter/receiver to further transmitter/receivers receiving signals therefrom using one set of carrier frequency channels and the return signal paths using a different set of carrier frequency channels. In one form the central transmitter/receiver is an exchange and the further transmitter/receivers are subscribers connected to the exchange.
摘要翻译：通信系统采用具有离散多音（DMT）的高速数字链路，其中从中央发射机/接收机到其他发射机/接收机的向外路径使用一组载波频率信道和使用不同的载波频率信道的返回信号路径从其接收信号载波频道集。在一种形式中，中央发射机/接收机是交换机，而另外的发射机/接收机是与交换机连接的用户。

43. 发明申请

WO1994016511A1 TELECOMMUNICATIONS NETWORK 审中-公开
标题翻译：电信网络
公开(公告)号：WO1994016511A1
公开(公告)日：1994-07-21
申请号：PCT/GB1994000029
申请日：1994-01-07
申请人： GPT LIMITED , ARNOLD, John, Spencer
发明人： GPT LIMITED
IPC分类号： H04L12/56
CPC分类号： H04L12/66
摘要： In a telecommunications switching network which has a plurality of sub-networks, each sub-network having a plurality of User Network Ports, the Destination and Source addresses in a cell-header carried by a cell switched by the network are each divided into a Port Address part and a Sub-Network Address part, the Source Sub-Network part being implicit whilst the cell remains in the Source Sub-Network and similarly the Destination Sub-Network part is implicit when the cell arrives in the Destination Sub-Network, the Source and the Destination Sub-Networks being linked via a Cross-connect switching device wherein the address formats are changed.
摘要翻译：在具有多个子网络的电信交换网络中，每个子网络具有多个用户网络端口，由网络交换的小区携带的小区头中的目的地址和源地址分别分别为端口地址部分和子网络地址部分，当子单元保留在源子网络中时，源子网络部分是隐含的，并且类似地，当小区到达目的地子网络时，目的地子网络部分是隐含的，源和目的地子网通过交叉连接交换设备链接，其中地址格式被改变。

44. 发明申请

WO1993019559A1 ATM RADIO NETWORK 审中-公开
标题翻译： ATM无线网络
公开(公告)号：WO1993019559A1
公开(公告)日：1993-09-30
申请号：PCT/GB1993000562
申请日：1993-03-18
申请人： ROKE MANOR RESEARCH LIMITED , GPT LIMITED , HULBERT, Anthony, Peter , McTIFFIN, Michael, John , PHILIP, Alexander, Schroder
发明人： ROKE MANOR RESEARCH LIMITED , GPT LIMITED
IPC分类号： H04Q07/04
CPC分类号： H04Q11/0478 , H04L2012/5607 , H04L2012/5651 , H04L2012/5661 , H04L2012/5672
摘要： The invention relates to the interface between the normal fixed telecommunications infrastructure and the network which interconnects base stations. A conversion is made between standard ATM cells in the telecommunications infrastructure and half ATM cells in the network which interconnects base stations. However, the half ATM cells in the base station interconnect network would be filled out with some additional signalling and routing information in order to resemble and behave like ordinary full ATM cells. In this way the hardware used in the base station interconnect network could be of the same type as that used in the fixed telecommunications network.
摘要翻译：本发明涉及正常固定电信基础设施与互连基站的网络之间的接口。在电信基础设施中的标准ATM信元与互连基站的网络中的一半ATM信元进行转换。然而，基站互连网络中的一半ATM信元将被填充一些额外的信令和路由信息，以便像普通的完全ATM信元一样和行为。以这种方式，在基站互连网络中使用的硬件可以与固定电信网络中使用的硬件类型相同。

45. 发明申请

WO1993003557A1 TELECOMMUNICATIONS SWITCHING DEVICE 审中-公开
标题翻译：电信交换设备
公开(公告)号：WO1993003557A1
公开(公告)日：1993-02-18
申请号：PCT/GB1992001439
申请日：1992-08-03
申请人： GPT LIMITED , JEFFREY, Mark, Timothy , PROCTOR, Richard, John , DUTHIE, Peter, John
发明人： GPT LIMITED
IPC分类号： H04J14/00
CPC分类号： H04L12/5601 , H04L49/106 , H04L49/255 , H04L2012/5605 , H04L2012/5627 , H04Q11/0005 , H04Q11/0066 , H04Q2011/0041
摘要： A telecommunications switching device comprises a plurality of ports and a plurality of switching units and connecting means for connecting each of the ports to each of the switching units in turn, wherein the connecting means includes photonic channel separation means and photonic space switching means.

46. 发明申请

WO1993000778A1 SPEECH SIGNAL TRANSMISSION 审中-公开
标题翻译：语音信号传输
公开(公告)号：WO1993000778A1
公开(公告)日：1993-01-07
申请号：PCT/GB1992001131
申请日：1992-06-22
申请人： GPT LIMITED , MUNK, Herbert, Georg
发明人： GPT LIMITED
IPC分类号： H04Q07/04
CPC分类号： H04W88/181
摘要： In the transmission of speech in mobile telephone services where mobile handsets co-operate with a base station via a radio link, the base station being connected to a mobile switching centre in turn connected to a public network, communication between the handsets and base stations is achieved using a standard selected to minimize bandwidth utilisation. Sample standards are GSM and DECT. It has currently been proposed that in utilising either of these standards a number of encoded speech channels will be multiplexed at the A interface between the base station and the MSC. The multiplex signal would then be converted to a 64 kb/s format at the interface between the MSC and the pulbic network to which the MSC is connected. This proposal has a number of disadvantages. To alleviate these disadvantages it is proposed that conversion to the 64 kb/s format should be avoided if the recipient node can reconstitute the speech directly from its encoded format and that to such recipient nodes the encoded speech is sent in packetised form.
摘要翻译：在手机通过无线电链路与基站合作的移动电话服务中的语音传输中，基站连接到移动交换中心，依次连接到公共网络，手机和基站之间的通信是使用所选择的标准实现最小化带宽利用率。样品标准是GSM和DECT。目前已经提出，在利用这些标准中的任何一个时，将在基站和MSC之间的A接口处复用许多编码语音信道。然后，复用信号将在MSC与MSC所连接的脉冲网络之间的接口处转换为64kb / s格式。这个建议有很多缺点。为了减轻这些缺点，提出如果接收方节点可以直接从其编码格式重构语音，并且向接收节点发送编码语音，则应该避免转换为64kb / s格式。

47. 发明申请

WO1992012446A1 OPTICAL FIBRE INTERFACE 审中-公开
标题翻译：光纤接口
公开(公告)号：WO1992012446A1
公开(公告)日：1992-07-23
申请号：PCT/GB1992000059
申请日：1992-01-10
申请人： GPT LIMITED , ALLEN, James, Joseph , NOURSHARGH, Noorallah
发明人： GPT LIMITED
IPC分类号： G02B06/30
CPC分类号： G02B6/30
摘要： In accordance with the present invention the material similarity of all-silica waveguides or other devices and optical fibres is utilised to establish an epoxy-free fusion interfacing between optical fibres and integrated-optic devices by using laser welding techniques. This is uniquely applicable to all-silica integrated devices since they have virtually identical material properties to those of optical fibres. The method comprises the steps of machining a locating groove in a silica block, fixing a prepared length of the optical fibre in the locating groove, bringing the block and the device into juxtaposition and aligning the block and the device to provide maximum transmission of a signal from the fibre to the device and laser welding the block and the device together.

48. 发明申请

WO1992002095A1 A DATA COMMUNICATION SYSTEM USING ENCRYPTED DATA PACKETS 审中-公开
标题翻译：使用加密数据包的数据通信系统
公开(公告)号：WO1992002095A1
公开(公告)日：1992-02-06
申请号：PCT/GB1991001207
申请日：1991-07-18
申请人： GPT LIMITED , WHITE, Andrew
发明人： GPT LIMITED
IPC分类号： H04L29/06
CPC分类号： H04L63/04 , H04L29/06 , H04N21/23476
摘要： Data is encrypted for transmission over a non-secure communications network by providing the data (D) with a header (H) and a trailer (T) portion containing full information as to the sender and recipient of the data so as to form a data packet (a), encoding the packet (HE, DE, TE; (b)), and providing the encoded packet (HE, DE, TE) with a further header (H') and trailer (T') portion to form a further packet (c). The further header and trailer portion only contain information identifying the entry and exit nodes at which the further packet enters and leaves the non-secure network. On arrival at the exit node the further packet can be decoded to reconstruct the original packet (b) which is then conveyed to its destination via a local secure network. Padding non-secure network with dummy messages makes it impossible to identify the presence of genuine traffic between particular nodes of the non-secure network. Thus secure data may be sent via commercial non-secure packet switching networks without indicating its presence.

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