CN1193227A - 电信设备 - Google Patents

电信设备 Download PDF

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CN1193227A
CN1193227A CN97122932A CN97122932A CN1193227A CN 1193227 A CN1193227 A CN 1193227A CN 97122932 A CN97122932 A CN 97122932A CN 97122932 A CN97122932 A CN 97122932A CN 1193227 A CN1193227 A CN 1193227A
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R·J·普罗克托尔
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0057—Operations, administration and maintenance [OAM]
    • H04J2203/006—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5614—User Network Interface
    • H04L2012/5615—Network termination, e.g. NT1, NT2, PBX
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H04L2012/5627—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5663—Support of N-ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5672—Multiplexing, e.g. coding, scrambling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1308—Power supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13166—Fault prevention
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13167—Redundant apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13199—Modem, modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13202—Network termination [NT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1329—Asynchronous transfer mode, ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13292—Time division multiplexing, TDM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13299—Bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13386—Line concentrator

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)

Abstract

铜线对将家中的网络终端设备3与相对本地化的多路复用器2(例如街头服务亭)连接起来,传送着例如在多路复用器混合的ATM和ISDN组成的高数据率(例如VDSL)信号。多路复用器需要配备电源,但万一电源出了故障,VDSL信号就不能在多路复用器中产生。为了在此情况下有个后退的余地,例如用继电器A、B、C形成了一个从当地交换局至网络终端设备的金属链路,从而即使较高数据率的ATM出故障也能在家中接收ISDN信号。

Description

电信设备
本发明涉及电信设备。
传输率提高的数据传输系统在研制中，这给用户利用其家中的终端设备即可享用的服务面的扩大创造了条件。现有的终端设备，除模拟电话外还能处理象传真发送或计算机通信之类符合ISDN(综合业务数字网)技术规范的各种业务，但提高数据率可能还会给电视信号往用户终端的传送和交互式遥视创造条件。一般说来，家中的终端设备是借助于铜线对与本地的交换局连接的，但随着数据率的提高而增大的带宽使数据不能在距离超过例如9公里的情况下传输。
因此，有人建议设置区域站(例如，街头服务亭)在例如1公里的半径范围内给用户提供服务，并在该站将分别与当地交换局或其它网络连接的各项业务(例如通过铜线对与当地交换局连接的ISDN业务和通过光纤连接的数据率更高的业务)合并。应该指出的是，电信网在密度大的居民区是已采用街头服务亭的，但这些都是无源装置。
由于上述建议的街头服务亭可能要混合信号，因此需要给它们配备电源。但电源出故障时间题就来了。
本发明提供一种供通过链路与通信网连接以接收线路信号的网络终端设备，该设备的处理装置配置得使其在与表示第一业务的线路信号相适应的数据率工作，且使其从线路信号提取第一业务并提取在低于产生第一业务时的数据率产生但包含在线路信号中的第二业务，处理装置有选择地能在第二业务较低的数据率下工作，从该数据率较低的线路信号提取第二业务。
本发明还提供一种供通过链路与网络终端设备连接的多路复用器，该多路复用器包括：多个数据接收端口，供从通信网以表示第一业务的数据率接收数据和以表示第二业务的较低数据率接收数据；线路信号发生和传输装置，用以产生表示第一业务和第二业务的线路信号，并沿链路传送所述线路信号；多路复用器的电源装置，包括连接装置，用以将接收表示第二业务的数据的端口在电源装置出故障时直接接链路。
链路(例如铜线对)以与第一业务(例如象电视之类的高数据率业务)相适应的第一数据率传输数据，但含有在较低的数据率下产生的数据，例如装有模拟电话的ISDN，两者由多路复用器加以混合。电源出故障时，系统后退到较低数据率的业务。
目前在研制中可供终端用户的高速数据率设施使用的适当方法中有VDSL(极高速数字不对称用户线)、HDSL(高速用户线)和ADSL(对称数字用户线)。ADSL在ANSI参考文献T1.413中有介绍。一般说来，VDSL能在高达25兆位/秒的数据率在一个方向工作，以3兆位/秒的数据率在另一个方向工作。HDSL一般在各方向的数据率高达2兆位/秒，ADSL在一个方向的数据率高达6兆位/秒，在另一个方向的数据率为100千兆/秒，很低。与此相比，基本速率ISDN一般是在144千位/秒下产生的。
与第二业务有关的较低数据率可以用我们待审批的专利申请P/60938/GPTS3中所述的设备和方法在多路复用器中与第一业务有关的较高数据率合并。
现在参看附图以举例的方式说明按本发明的装有多路复用器和供通过链路连接的网络终端设备的电信设备。附图中：
图1是链路中传输的各种信号所占据的频谱区的示意图；
图2示出了多路复用器与网络终端设备在正常操作情况下的连接；
图3示出了本发明第一实施例的电信设备；
图4示出了图3的电信设备在电源出故障时的等效电路图；
图5示出了本发明第二实施例的电信设备。
所有附图中，同样的编号表示同样的部件。
参看图1。模拟电话所占据的带宽以AT表示，ISDN的带宽以ISDN表示。从图中可以看到，VDSL与ISDN的带宽部分重叠。所使用的传输频率越高，沿铜线对的损耗就越大，因此总希望VDSL的带宽与ISDN的重叠，因为若VDSL的带宽是与ISDN的带宽分开的频率，则会沿铜线对引起严重的传播问题。
参看图2。简单的铜线对1将街头服务亭中的多路复用器2与住家的网络终端设备3连接。街头服务亭内的多路复用器2又与当地的交换局连接或者先通过光纤接线4或其它象防辐射药物之类的高数据率接口再通过铜线对5与集线器连接。
光纤4传送采用各节点之间的通信链路的ATM(异步传输模式)，例如根据ITU-T建议I.150以一般短得足以供对延迟敏感的器件用，但长得足以供数据使用，一般为53位组，叫做单元的小信息包传输信息的电子计算机。一般来说，ATM数据可以在155兆位/秒或更高的数据率计时。铜线对5传送一般在144千位/秒计时的ISDN(例如D信道)。因此，两链路4和5可以较长，例如达9公里之长而无需使用转发器。
在多路复用器2处，进来的ATM数据与ISDN数据经过多路复用后沿铜线对链路1以VDSL的格式传输到住家。要进行这个多路复用，需要给多路复用器配备电源。
在家用网络终端设备处有两个输出端，即链路6和链路7，链路6将ATM传送入住家，可以接电视机顶箱，且可载送电视频道，甚至可以进行交互式遥视，链路7则由四条或多条接诸如传真机、计算机接线之类的标准ISDN业务或当然接电话机的铜线组成。电话机起码可装入网络终端设备3同样的总外壳中。由于这时以S格式传送ISDN信号的线路有四条或多条，因而铜线上的信号比通过交换局与多路复用器及网络终端设备3之间的U信号在性质上更简单。S格式在ITU参考文献I-430中有介绍，U格式在ETSI参考文献ETS300012中有介绍。
多路复用器必须接上电源才能进行合并操作。
参看图3。多路复用器现场发生电源故障时必然出问题。虽然为解决这种情况通常是配备备用电池，但实践经验证明，这类电池有时候会从街头服务亭中被卸走。
本发明在多路复用器和网络终端设备中配备了继电器A、B、C，从而可以使通信网络即使多路复用器得不到供电时也会后退到ISDN操作状态。
此外，网络终端设备3中还配备了芯片9，这是以U格式接收ISDN的芯片，与已设在多路复用器中的芯片10完全一样，又与设在交换局的ISDN“U”芯片8完全一样。
在正常操作、多路复用器现场配备有电源的情况下，ISDN在多路复用器中与ATM结合，由发信机(VDSL)13在链路1上发送，网终终端设备3中无需ISDN“U”芯片。在正常情况下，继电器A、B、C都保持在断开的位置，网络终端设备3在线路6上传送ATM，且借助于ISDN终端适配器(TA)11在链路7上传送ISDN“S”。ISDN终端适配器11本身又从收信机(VDSL)12接收其信号。由于VDSL将某些数据从住家送回多路复用器，因而收信机12也发信，VDSL发信机13也收信。ISDN终端适配器装有ISDN“S”芯片以便给住家的电话和传真机等产生ISDN“S”信号。
电源中断时，继电开关A、B、C闭合，这时多路复用器2实际上为中间链路14所旁路，于是交换局中的ISDN“U”芯片与ISDN“U”芯片9直接连接。这时，从功能上来讲交换局与住家之间的链路如图4所示。这就是说，即使街头服务亭处电源出故障，在家中也可享用ISDN提供的一系列标准服务项目。
多路复用器处的继电器A和B可借助于街头服务亭的电源保持断开位置，从而使停电时使金属线路直接接通。就住家而论，网络终端设备3可以(例如通过特定频率载波信号的消失)检测出VDSL链路的故障以便使继电器C转入闭合状态。
图5示出了另一修改方案，其中取消了图3的ISDN“U”芯片9，此功能元件则由VDSL收信机12模拟，其规定功能是将ATM传送给线路6，将ISDN传送给ISDN终端适配器11。VDSL发信机收信机12和13装有完善的模/数转换器而且能极快速地处理信号，而ISDN“U”芯片则只需要处理ISDN的四级2BIQ信号。通过由VDSL收信机12模拟USDN芯片9，网络终端设备节省了一个元件。
上述后退法也适用于HDSL和ADSL后退到ISDN，还适用于VDSL后退到HDSL或ADSL(这可沿铜线对传信达6公里之遥)或HDSL退回到ADSL，或更广泛地说适用于任何较高数据率业务退回到较低数据率业务。

Claims (4)

1.一种网络终端设备，供通过链路接通信网以接收线路信号用，其特征在于，其处理装置配置得使其在与表示第一业务的线路信号相适应的数据率工作，且使其从线路信号提取第一业务并提取在低于产生第一业务时的数据率产生但包含在线路信号中的第二业务，处理装置有选择地能在第二业务较低的数据下工作，从该数据率较低的线路信号提取第二业务。
2.如权利要求1所述的网络终端设备，其特征在于，配置得使其与第一业务相适应的数据率工作的处理装置能模拟能在第二业务较低数据率工作的处理装置。
3.一种多路复用器，供通过链路接网络终端设备，其特征在于，它包括：多个数据接收端口，供从通信网以表示第一业务的数据率接收数据和以表示第二业务的较低数据率接收数据；线路信号发生装置，用以产生表示第一业务和第二业务的线路信号并沿链路传送所述线路信号；多路复用器的电源装置，包括连接装置，用以将接收表示第二业务的数据的端口在电源装置出故障时直接接链路。
4.如权利要求3所述的多路复用器，其特征在于，装有至少一个继电器，该继电器配置得使其在电源装置出故障时将端口与链路连接起来。
CN97122932A 1996-11-21 1997-11-21 电信设备 Pending CN1193227A (zh)

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GBGB9624180.7A GB9624180D0 (en) 1996-11-21 1996-11-21 Telecommunication equipment

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DE69738802D1 (de) 2008-08-14
UA46024C2 (uk) 2002-05-15
EP0844802A3 (en) 2001-09-12
GB9717417D0 (en) 1997-10-22
GB2319701A (en) 1998-05-27
EP0844802A2 (en) 1998-05-27
GB9624180D0 (en) 1997-01-08
EP0844802B1 (en) 2008-07-02
US6185225B1 (en) 2001-02-06

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