公开(公告)号：EP0777294B1

公开(公告)日：2003-08-13

申请号：EP96308636.8

申请日：1996-11-29

申请人： Nortel Networks Limited

发明人： Smith, Adrian David ,  Clark, Paul

IPC分类号： H01Q1/52

CPC分类号： H01Q1/526

公开(公告)号：EP0907993B1

公开(公告)日：2003-07-30

申请号：EP97928354.6

申请日：1997-06-25

申请人： Nortel Networks Limited

发明人： JOLLEY, Nigel Edward ,  DAVIS, Fiona ,  EPWORTH, Richard Edward

IPC分类号： H01S3/06 ,  H01S3/131 ,  H04B10/17 ,  H04J14/02

CPC分类号： H04B10/2912 ,  H01S3/10023 ,  H04B10/291 ,  H04B10/2941 ,  H04B2210/003

摘要： A variable gain optical amplifier, in which homogeneous gain broadening is dominant, has first and second fixed gain rare-earth doped optical waveguide amplifiers (51, 53) optically in series together with an intervening variable attenuation optical attenuator (52). This arrangement circumvents the problem of gain tilt encountered when operating such amplifiers under variable gain conditions. An alternative form of the module has variable gain waveguide amplifiers, but these are co-regulated so that the aggregate of their gain at a wavelength within the gain spectrum is maintained constant. A further alternative form of module is employed in a concatenation of such modules. In such a concatenation, the gain of individual modules is allowed to vary, but the aggregate of the gain, at a wavelength within the gain spectrum, of all the waveguide amplifiers of all the modules of the concatenation is maintained constant.

公开(公告)号：EP1327323A2

公开(公告)日：2003-07-16

申请号：EP01972303.0

申请日：2001-10-04

申请人： Nortel Networks Limited

发明人： O'CONNELL, David ,  O'MURCHU, Donal ,  SMYTH, Joseph

IPC分类号： H04L12/24 ,  H04M1/253 ,  H04L12/14

CPC分类号： H04M7/006 ,  H04L41/5003 ,  H04L41/5087 ,  H04L43/00 ,  H04L43/0829 ,  H04L43/0852 ,  H04M3/2236

摘要： A method of monitoring quality of service in communications over a packet-based network, involves transmitting test packets across the network and monitoring transmission characteristics such as packet loss and transmission delay for the test packets. A measure of network performance is then dynamically calculated from the transmission characteristics, andis displayed at the endpoint as a dynamic indication of the network performance.

摘要翻译： 通过基于分组的网络监测通信中的服务质量的方法涉及通过网络发送测试分组并监测测试分组的传输特性，例如分组丢失和传输延迟。 然后从传输特性动态计算网络性能的度量，并在端点显示作为网络性能的动态指示。

公开(公告)号：EP1318417A2

公开(公告)日：2003-06-11

申请号：EP02258392.6

申请日：2002-12-04

申请人： Nortel Networks Limited

发明人： Janssen, Adrian

IPC分类号： G02B5/28

CPC分类号： G02B5/284 ,  G02B5/281

摘要： A multi cavity comb filter for interleaving or de-interleaving WDM signals has a plurality of stacked optical cavities each having substantially the same thickness. The multiple cavity arrangement provides a comb reflection response and a comb transmission response with broad peaks, so that the filter can be used for transmitting one group of channels and reflecting another group of channels at interleaved positions. The cavities are preferably formed from silicon wafers, so that existing techniques can be employed to obtain specific cavity thicknesses with sufficient accuracy and uniformity.

摘要翻译： 用于交织或解交织WDM信号的多腔梳状滤波器具有多个层叠的光学腔，每个具有基本上相同的厚度。 多腔布置提供梳状反射响应和具有宽峰值的梳状传播响应，使得滤波器可用于传送一组通道并在交错位置反射另一组通道。 空腔优选地由硅晶片形成，使得可以采用现有技术以获得具有足够精度和均匀性的特定腔体厚度。

公开(公告)号：EP0867097B1

公开(公告)日：2003-04-23

申请号：EP96942458.9

申请日：1996-12-13

申请人： Nortel Networks Limited

发明人： SHARP, Iain ,  WELLING, James, Brian ,  CLAPP, Bradford

IPC分类号： H04Q7/24

CPC分类号： H04Q3/0029 ,  H04Q2213/13098 ,  H04Q2213/13103 ,  H04Q2213/13141 ,  H04Q2213/13345

摘要： A method of routing calls which require intelligent network (IN) services between a pair of subscribers, at least one of which subscribers is a mobile network subscriber. A mobile network (30) routes a call to an intelligent network (31) via a first path (32) to apply an IN service, and routes the call back to the mobile network via a second (33) or a third (34) path. Calls routed via the second path (33) are completed to the called party. Calls routed via the third path (34) may require further routing to the IN (31) prior to completion, such as where a different called party is involved or where a terminating IN service may be needed.

公开(公告)号：EP1065858A3

公开(公告)日：2003-04-02

申请号：EP00301913.0

申请日：2000-03-08

申请人： Nortel Networks Limited

发明人： Mauger, Roy

IPC分类号： H04L29/06 ,  H04Q11/04 ,  H04L12/56 ,  H04L12/46

CPC分类号： H04Q11/04 ,  H04L45/00 ,  H04L45/02 ,  H04L45/50 ,  H04L69/16 ,  H04L69/168 ,  H04Q2213/13034 ,  H04Q2213/13196 ,  H04Q2213/13204 ,  H04Q2213/13339 ,  H04Q2213/13348 ,  H04Q2213/13372 ,  H04Q2213/13389

摘要： A network arrangement for delivering IP services to subscribers comprises a core network (10), a plurality of label switched media gateways (22,22a) coupled to the network (10) and each providing an interface for one or more subscriber terminals (25,25a,25b). Call servers (11,11a) associated with the network (10) are used to establish connections between pairs of gateways (22,22a), these connections being routed across the core network (10) via tunnels established therein. The tunnels are exclusively reserved for traffic between the label switched media gateways (22,22a) so as to provide security of that traffic from third party access and to provide a guaranteed quality of service. Because traffic is accepted into a tunnel only if bandwidth is available in that tunnel, firm and meaningful quality of service guarantees can be given to users.

公开(公告)号：EP1247387A1

公开(公告)日：2002-10-09

申请号：EP00983415.1

申请日：2000-12-19

申请人： Nortel Networks Limited

发明人： O'DOHERTY, Michael

IPC分类号： H04L29/08 ,  H04L29/06

CPC分类号： H04Q3/72 ,  G06F2209/549 ,  H04L29/06 ,  H04L29/06027 ,  H04L65/1006 ,  H04M3/42042 ,  H04M3/42059 ,  H04M3/42178 ,  H04M3/436 ,  H04M7/006 ,  H04M2203/2033 ,  H04M2242/22 ,  H04Q2213/13003 ,  H04Q2213/1305 ,  H04Q2213/13091 ,  H04Q2213/13093 ,  H04Q2213/13095 ,  H04Q2213/13106 ,  H04Q2213/13173 ,  H04Q2213/13175 ,  H04Q2213/13176 ,  H04Q2213/13196 ,  H04Q2213/13204 ,  H04Q2213/13389

摘要： Modifications to SIP are made which significantly extend the functionality of SIP for example by allowing a service for automatically setting up multi-media conferences to be easily provided. SIP messages are associated with computer software code such as Java byte code, Java applets or mobile autonomous software agents. An example of a mobile autonomous agent is a Java mobile agent. This computer software code may be contained in the body of a SIP message or an address indicating where the computer software code is located is stored in the SIP message. SIP clients are arranged such that on receipt of a SIP message that has been associated with computer software code, that code is executed by a processor associated with the SIP client. For example, in the case that Java applets are contained in a SIP message these are executed by a Java Virtual Machine associated with the SIP client. If a Java mobile agent is contained in the SIP message this executes on a Java Mobile Agent Virtual Machine associated with the SIP client. In one example, such computer software code must always be executed by the processor associated with the SIP client before that SIP client carries out any other actions related to the SIP message. Preferably an indicator is put into the header of a SIP message to indicate that it has been associated with computer software code, and SIP clients are arranged to detect the presence of such indicators. An application programming interface is created in order that the computer software code may control the SIP client and/or any processor associated with that SIP client. In one example, computer software code is associated with SIP messages in order that a service for automatically setting up multi-media conferences is provided.

公开(公告)号：EP0948214A3

公开(公告)日：2000-03-15

申请号：EP99200584.3

申请日：1999-03-02

申请人： NDS LIMITED

发明人： Murray, Kevin Alistair ,  Davies, Colin ,  Stubbings, Clive Anthony ,  Huggett, Anthony Richard ,  Warburton, Richard John ,  Funnel, John Stuart

IPC分类号： H04N7/62 ,  H04N7/50 ,  H04N7/30

CPC分类号： H04N19/61 ,  H04N19/00 ,  H04N19/70

摘要： The present invention relates to the detection of a predetermined sequence in a digital bit-stream, and more particularly a method and apparatus for the fast and efficient detection of a start code sequence. As with many packet based bit-streams, packets are identified through the use of a start code. The start code is a unique sequence which occurs only to indicate the start of a packet, and can never occur in the data portion of a bit-stream. Identifying the start of packets is crucial in the processing of packetised bit-streams. In the field of digital broadcasting, a common format of digital video compression is that of the Moving Picture Expert Group (MPEG). MPEG uses a packetised bit-stream and packets are preceded by a start code to enable individual packets to be identified. In any real-time processing of MPEG bit-streams, it is vital to be able to identify the MPEG start codes as quickly and efficiently as possible. Performing this in hardware is a relatively straightforward operation. Detecting start codes using software is also straightforward in a non real-time situation. However, where an end-to-end real-time software solution is required to process MPEG data it may not be possible or desirable to use a hardware-based solution. The present invention overcomes the problems of the prior art and provides a method and apparatus for the fast and efficient detection of the MPEG start code sequence.

公开(公告)号：EP0980186A2

公开(公告)日：2000-02-16

申请号：EP99202518.9

申请日：1999-08-02

申请人： NDS LIMITED

发明人： Davies, Colin, Dr. ,  Huggett, Anthony R. ,  Stubbings, Clive A., Dr. ,  Funnell, John S. ,  Murray, Kevin A. ,  Warburton, Richard J.

IPC分类号： H04N7/58 ,  H04N7/24

CPC分类号： H04N21/2365 ,  H04N21/23611 ,  H04N21/2401

摘要： The present invention relates to digital data transmission and more precisely a method and apparatus for managing a decoder buffer.
In data transmission applications, such as digital video broadcasting, large amounts of data are encoded and transmitted to decoders having a decoder buffer. Management of the decoder buffer is very important as transmittal of too little data can result in the decoder buffer underflowing (becoming empty), or if too much data is transmitted the decoder buffer could overflow. Both decoder buffer overflow and underflow result in loss of data and the decoding process is adversely affected.
The present invention provides a method and apparatus for managing a decoder buffer such that decoder buffer overflow and underflow are minimised.

摘要翻译： 本发明涉及数字数据传输，更准确地说，涉及一种用于管理解码器缓冲器的方法和装置。 在诸如数字视频广播的数据传输应用中，大量数据被编码并传送到具有解码器缓冲器的解码器。 解码器缓冲器的管理非常重要，因为传输太少的数据可能导致解码器缓冲器下溢（变空），或者如果发送的数据太多，则解码器缓冲器可能溢出。 解码器缓冲区溢出和下溢均导致数据丢失，解码过程受到不利影响。 本发明提供一种用于管理解码器缓冲器的方法和装置，使得解码器缓冲器溢出和下溢最小化。

公开(公告)号：EP0973290A2

公开(公告)日：2000-01-19

申请号：EP99202208.7

申请日：1999-07-06

申请人： NDS Limited

发明人： Budge, Michael

IPC分类号： H04J3/24 ,  H04N7/52

CPC分类号： H04N21/4347 ,  H04B7/18513 ,  H04J3/247 ,  H04N21/235 ,  H04N21/23614 ,  H04N21/2365 ,  H04N21/23655 ,  H04N21/4348 ,  H04N21/435

摘要： The invention relates to multiplexing data packets in a data service channel with data in one or more digital video signal channels to form a multiplexed output signal. The data in the data service channel may include control data, conditional access data, electronic program guides, paged data services, service information, broadcast internet information, and business information such as financial share information.
The data packets each comprise a time stamp indicating a requested delivery time and the data packets are sorted into a queue in time stamp order. The urgency of the data service channel is calculated as a function of the queue length and requested delivery times. The share of the bit rate of the multiplexed output signal allocated to the data service channel is varied according to its urgency. An error value is calculated for each data packet to represent the error between the expected delivery time and the requested delivery time to the head of the queue and the urgency of the data channel is derived as an average of the error values. The average may be a weighted average.

摘要翻译： 本发明涉及将数据业务信道中的数据分组与一个或多个数字视频信号信道中的数据进行复用以形成复用的输出信号。 数据服务信道中的数据可以包括控制数据，条件访问数据，电子节目指南，分页数据服务，服务信息，广播互联网信息以及诸如财务共享信息的商业信息。 数据分组各自包括指示所请求的传递时间的时间戳，并且数据分组按时间戳顺序排列成队列。 根据队列长度和请求的交货时间计算数据服务通道的紧急性。 分配给数据业务信道的复用输出信号的比特率的份额根据其紧急度而变化。 为每个数据包计算出一个错误值，以表示预期传送时间与向队列头部发出的请求传送时间之间的误差，数据通道的紧急度被导出为误差值的平均值。 平均值可以是加权平均值。