CN1450785A - Distributed asymmetrical digital user line broadband optical fiber insertion system - Google Patents
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Abstract
The present invention composed of DSLAM subsystem being connected with remote end or the user end as well as being equipped with DSL part in ONU, ADSL Modem at the user end and twisted pair in between; APOW subsystem being connected with telephone exchanger of telecommunication station as well as being equipped with light line terminal, light power beam splitter and PON part in ONU; and network managing and controlling subsystem being equipped with network managing software and hardware platform to be responsible for operation, management and maintenance of the entire switch in system. APON technique and optical fibre are applied at switch in backbone layer and ADSL twisted pair switch in technique at the user switch in layer. Feeder line, wiring and service wire are used for transmission of the whole network and the topology is a tree type in branch structure.
Description
Technical Field
The invention belongs to the field of communication, and relates to a broadband network access system, in particular to a distributed asymmetric digital subscriber line broadband optical access system (hereinafter referred to as a distributed DSLAM system).
Background
With the rapid development of data and multimedia services represented by Internet services, users have increasingly demanded network bandwidth. Although the bandwidth of the existing backbone network has been greatly expanded by adopting the advanced optical fiber communication technology, the access network connecting the users and the telecommunication network still maintains the traditional narrow-band access mode, and the bottleneck problem is not solved all the time (i.e. the last one kilometer problem).
In order to meet the huge demand of users for bandwidth, many broadband access technologies are in use. Common broadband access technologies include ADSL (asymmetric digital subscriber line), APON (passive optical network based on asynchronous transfer mode), HFC (hybrid fiber coaxial network), LMDS, and the like. Among them, two access modes, ADSL and APON, are better. The greatest advantages of the ADSL access mode are as follows: it can fully utilize a large number of existing telephone twisted-pair wires, and has low cost and large user group. The APON access method has obvious advantages in bandwidth capacity, transmission quality and maintenance, and is the final direction of the development of the access network, but has the disadvantage that the cost of a unit user is high.
However, the core diameter of the telephone twisted pair adopted by the current telephone network in China is mostly 0.32mm and 0.4mm, and the quality is not good enough, so that the transmission quality of the line is extremely poor, which brings the following adverse effects to the domestic ADSL access mode: 1. the service opening rate is low. The number of telephone twisted pairs currently available in the country to support ADSL transmission is only 10%. 2. The network coverage is small, and the number of actual users is small. Theoretically, the effective transmission distance of ADSL is 3-5 km, and the actual domestic coverage radius is much less than 5 km. 3. The data transmission rate is limited. Theoretically, the uplink rate of ADSL is 640-1 Mbit/s, and the downlink rate is 1-8 Mbit/s, but in practical application, the uplink rate is mostly below 520bit/s, and limited by the quality and transmission distance of twisted-pair cables. 4. The lines are numerous, and the operation and maintenance are complex.
Therefore, the existing DSLAM system (combination of ADSL and ATM technologies) is hard to be competent for the development of future bandwidth services, and a new technology must be adopted to solve the problems existing in reality, so as to better exert the advantages of the ADSL broadband access mode.
In contrast to the ADSL case, the optical access network technology represented by APON shows great advantages in the following respects: 1. the transmission capacity is huge, the upper and lower bandwidth of the practical system can reach 155 Mbit/s-622 Mbit/s, the practical system can also continuously expand, the speed can reach more than Gbit/s, and the ever-increasing bandwidth requirement of a user can be easily met. 2. The method has the advantages of small electromagnetic interference, good transmission quality and strong confidentiality. 3. The transmission loss is small, and the transmission distance is long and can reach about 20 kilometers. 4. The failure rate is low, and the maintenance is easy. Based on this, APON is considered as the best access way for future fiber to the home. However, the most significant disadvantage is that the cost is too high, and the price per bandwidth is hard for the current user to bear.
Disclosure of Invention
In order to solve the problems of poor broadband access quality of a traditional DSLAM system telephone twisted-pair line, overhigh broadband access cost of an optical fiber and the contradiction between the broadband access cost and the transmission quality, the invention aims to provide a distributed asymmetric digital subscriber line broadband optical access system (distributed DSLAM system for short), which integrates the advantages of two access technologies of APON and ADSL and provides a broadband Internet access system with low cost and high quality for users.
In order to achieve the purpose, the invention adopts the following design scheme: a distributed asymmetric digital subscriber line broadband optical access system is composed of a DSLAM subsystem connected with a remote end or a user end, an APON subsystem connected with a telephone exchange of a telecommunication office, a network management and control subsystem; the DSLAM subsystem consists of a DSL (digital subscriber line) part in an integrated optical network unit (ONU for short), a user side ADSLModem and a twisted pair therebetween and is responsible for multiplexing and decomposing ADSL services of the system; the APON subsystem consists of an Optical Line Terminal (OLT), an optical power Splitter (Splitter) and a PON (passive optical network) part in the ONU and is responsible for ATM service transmission after the system collects; the network management and control subsystem is composed of network management software and a hardware platform which are responsible for the operation, management and maintenance of the whole access system;
the invention adopts APON technology and optical fiber transmission at the access trunk layer; in the user access layer, ADSL twisted pair access technology is adopted; the whole network adopts three parts of feeder line, wiring and lead-in wire transmission, and the topology is tree-type branch structure.
An Optical Line Terminal (OLT) in the APON subsystem is arranged in a telecommunication exchange office and is mainly responsible for the connection between the system and a service network (such as a telephone network, the Internet and the like); the optical power Splitter (Splitter) in the APON subsystem is usually placed outdoors and is responsible for distributing the signal to the various ONUs.
And the integrated Optical Network Unit (ONU) in the DSLAM subsystem is placed at a far end or a user position to realize the access of an ADSL user line.
The transmission modes of the feeder line, the wiring and the lead-in wire are as follows: the optical line terminal from the telephone exchange of the telecommunication office to the APON subsystem is feeder transmission, the optical line terminal from the APON subsystem to the integrated optical network unit of the DSLAM subsystem is wiring transmission, and the ADSL Modem equipment from the integrated optical network unit of the DSLAM subsystem to a user is twisted-pair lead-in transmission.
The network management and control subsystem is distributed in each physical component of the access network system and comprises the following parts: an Optical Line Terminal (OLT) controller, a network management database server, a client workstation and a data communication network.
Because the invention adopts the above technology, and combines APON technology and ADSL technology, the invention has a plurality of innovation points compared with the traditional DSLAM system in the general design thought and the specific implementation mode: 1. the total architecture introduces a Wavelength Division Multiplexing (WDM) technology, and a wavelength router part is used for replacing power beam splitting, so that the WDM and the APON are combined to form a Composite Passive Optical Network (CPON). The method has the characteristics of APON and WDM-PON solutions, comprehensively meets the requirements of users on language, data and image transmission, and is compatible with products of APON technology. 2. The advantages of optical fiber transmission are exerted, and the integration of the PON network and the ADSL network is realized. The ADSL network coverage area is enlarged, the access cost is effectively reduced, and the scale of the access network can be flexibly configured according to the actual network requirement. 3. A dynamic bandwidth allocation mechanism is adopted, the traditional static bandwidth allocation mode that one DSLAM device occupies one port is changed, the bandwidth utilization rate is improved, and the service quality is ensured. 4. Based on ATM technology, the fusion of broadband service and narrowband service is realized, and various service requirements are met. 5. And the user cost is greatly reduced by adopting multilayer case superposition and high-density integration of user port data. In the design aspect of the chassis, on one hand, the port density of the line card is improved, and on the other hand, the cascade connection of multiple layers of chassis is realized, so that the average access cost of users is reduced. Meanwhile, the design of front and rear panels is adopted, so that the convenience and the attractiveness of equipment use are improved. 6. The network management system based on the SNMP protocol is simple and has low cost. The SNMPv1/v2 is used as a basic network management system, the convenience of Internet management is fully utilized, and the ideas of Web, CORBA and TMN are combined, so that the realization is simple, the cost is low, and the usability is good.
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The invention will be further explained with reference to the drawings.
FIG. 1 is a network structure diagram of the distributed DSLAM system of the present invention
FIG. 2 is a block diagram of the network management and control subsystem of the present invention
FIG. 3 is a diagram of the physical components of the network management and control subsystem according to the present invention
Fig. 4 shows a conventional DSLAM access system
FIG. 5 shows a distributed DSLAM access system according to the present invention
Detailed Description
The distributed DSLAM system of the invention is based on the traditional DSLAM access system, and based on ATM (asynchronous transfer mode) technology, introduces APON access and Wavelength Division Multiplexing (WDM) technology, fully utilizes the advantages of APON in transmission quality, capacity and maintenance, realizes the fusion of ADSL and APON technology on the network, and finally builds the comprehensive service access system with multimedia and full-service characteristics.
As shown in fig. 1, the distributed DSLAM system of the present invention is composed of a DSLAM subsystem, an APON subsystem, and a network management and control subsystem; wherein,
the DSLAM subsystem is composed of a DSL (digital subscriber line) part in an integrated optical network unit (ONU for short), a user side ADSL Modem and a twisted pair in between, and is responsible for the multiplexing and the decomposition of the ADSL service of the system;
the APON subsystem consists of an Optical Line Terminal (OLT), an optical power Splitter (Splitter) and a PON (passive optical network) part in the ONU and is responsible for ATM service transmission after the system collects;
the network management and control subsystem is composed of network management software and hardware platform which are responsible for the operation, management and maintenance of the whole access system.
As shown in fig. 1, an Optical Line Terminal (OLT) in the distributed DSLAM system of the present invention is disposed in a telecommunication switching office, and is mainly responsible for connecting the system to a service network (such as a telephone network, the internet, etc.); the optical power Splitter (Splitter) in the system is usually placed outdoors and is responsible for distributing the signal to the various ONUs: the integrated Optical Network Unit (ONU) in the system is placed at a remote end or a user position to realize the access of an ADSL user line.
Fig. 2 is a block diagram of the network management and control subsystem process of the present invention. Fig. 3 is a diagram of the physical components of the network management and control subsystem according to the present invention. As shown in the figure, the network management system software is distributed among various physical components of the access network system, and comprises the following parts: an Optical Line Terminal (OLT) controller, a network management database server, a client workstation and a data communication network.
An Optical Line Terminal (OLT) controller: the system is responsible for communication with an OLT node, mainly adopts an SNMP protocol and is a manager of an SNMP framework. The node controller interacts with the network management server in a DCOM (distributed component object model) mode to store the alarm message and the statistic related information in the network management database. As a background program, it may run in Windows NT or Windows95/98/2000 environments.
A network management database server: the system is mainly responsible for division of management domains, storage of management information, safety control and the like. The database access is based on open database connectivity (ODBC) standard, supports various databases based on SQL, and adopts Windows NT Server 4.0/Windows 2000 Server and SQLServer 7.0.
A client workstation: for managing access to services, a Graphical User Interface (GUI) client and a Web client are included.
Data Communication Network (DCN): implemented by 10/100Base-T ethernet, Internet or PSTN dialup networks, a backup approach may be used to improve reliability.
And the network management personnel manage the network through the client workstation. If the network manager wants to change the configuration information of the remote ONU equipment, the network manager must transfer the management command to the OLT node controller through a client workstation (namely, a common PC) in the machine room, then the OLT node controller (namely, the common PC) issues the management command to the control software running in the OLT equipment by adopting an SNMP protocol, the management command is analyzed and processed and then forwarded to the ONU by the OLT equipment, and the result is returned to the manager after the ONU is completed and is stored in the network management database. The Ethernet and the Internet are used for communication between the equipment and the host. In the management process, all information needs to be stored in a network management database server, and a user needs to be authenticated by the server first to realize management operation.
The invention adopts a brand-new network architecture idea, which is different from the feeder line and the lead-in line structure of the traditional DSLAM system. The whole network is divided into three parts of a feeder line (from a switch to an OLT, an optical fiber), a wiring line (from the OLT to an ONU, the optical fiber) and an inlet line (from the ONU to ADSL Modem equipment of a user, a twisted pair) in transmission, and the topology is in a tree-type branch structure. In the access trunk layer, APON technology is adopted, optical fiber transmission is adopted, and the transmission distance is 0-20 kilometers; in the user access layer, ADSL twisted pair line access technology is adopted, and the transmission distance is 3-5 km. When signals are transmitted from an uplink direction to a downlink direction (namely, OLT ONU), data flow from a service network is introduced through OLT equipment, and a Time Division Multiplexing (TDM) mechanism is adopted, the OLT equipment transmits the signals to each ONU (or DSLAM), and the ONU (or DSLAM) receives the service signals according to a specific identifier and then forwards the signals to corresponding ADSL users; when signals are transmitted from the downstream to the upstream (namely, the ONU OLT), services from each user are firstly collected at the ONU (or the DSLAM), then a Time Division Multiple Access (TDMA) mechanism is adopted to compete for an upstream bandwidth with other ONUs, and finally the upstream bandwidth is multiplexed at the OLT and then transmitted to a service network.
Fig. 4 is a conventional DSLAM access system; fig. 5 is a distributed DSLAM access system according to the present invention. As can be seen from the figure, the distributed DSLAM access system of the present invention has the following advantages compared with the conventional DSLAM access system:
1. the number of interfaces of the telecommunication exchange office side equipment is reduced. Each DSLAM device of the conventional DSLAM access system needs one local side interface (ATM); and a plurality of (more than 8) DSLAM devices of the distributed DSLAM system only need one local side interface, thereby greatly reducing the cost.
2. The transmission distance and the network coverage area are greatly expanded. The transmission distance of the traditional DSLAM access system is only 3-5 kilometers; the transmission distance of the distributed DSLAM system can reach 25 kilometers at most, and the network coverage is wide.
3. Data transmission rates and quality are improved. In the traditional DSLAM access system, the downlink speed is 8Mbit/s and the downlink speed is 1Mbit/s under an ideal state, which is far from the actual situation and has poor transmission quality; the distributed DSLAM system not only can fully guarantee the ideal rate of ADSL, but also can improve the transmission rate higher than each other (for example, more than 20 Mbit/s).
By the technical scheme, APON and ADSL access technologies are combined, so that the limitation of the existing DSLAM system in the aspects of transmission distance and transmission rate is thoroughly overcome, and the network coverage area is greatly expanded; meanwhile, a low-cost and high-quality broadband Internet access mode is provided for users.
The above examples are merely illustrative of the present invention, and it is apparent that the present invention is not limited by these examples. Any modification, variation or equivalent replacement by those skilled in the art based on the spirit of the present invention is covered by the scope of the claims.
Claims (5)
1. A distributed asymmetric digital subscriber line broadband optical access system is characterized in that: the system is composed of a DSLAM subsystem connected with a far end or a user end, an APON subsystem connected with a telephone switch of a telecommunication office, and a network management and control subsystem;
the DSLAM subsystem is composed of a DSL (digital subscriber line) part in an integrated optical network unit (ONU for short), a user side ADSL Modem and a twisted pair in the DSL part and the user side ADSL Modem and is responsible for multiplexing and decomposing ADSL services of the system;
the APON subsystem consists of an Optical Line Terminal (OLT), an optical power Splitter (Splitter) and a PON (passive optical network) part in the ONU and is responsible for ATM service transmission after the system collects;
the network management and control subsystem is composed of network management software and a hardware platform which are responsible for the operation, management and maintenance of the whole access system;
the invention adopts APON technology and optical fiber transmission at the access trunk layer; in the user access layer, ADSL twisted pair access technology is adopted; the whole network adopts three parts of feeder line, wiring and lead-in wire transmission, and the topology is tree-type branch structure.
2. The distributed asymmetric digital subscriber line broadband optical access system of claim 1, wherein: an Optical Line Terminal (OLT) in the APON subsystem is arranged in a telecommunication exchange office and is mainly responsible for the connection between the system and a service network (such as a telephone network, the Internet and the like);
the optical power Splitter (Splitter) in the APON subsystem is usually placed outdoors and is responsible for distributing the signal to the various ONUs.
3. The distributed asymmetric digital subscriber line broadband optical access system according to claim 1 or 2, characterized in that: and the integrated Optical Network Unit (ONU) in the DSLAM subsystem is placed at a far end or a user position to realize the access of an ADSL user line.
4. The distributed asymmetric digital subscriber line broadband optical access system of claim 1, wherein: the transmission modes of the feeder line, the wiring and the lead-in wire are as follows: the optical line terminal from the telephone exchange of the telecommunication office to the APON subsystem is feeder transmission, the optical line terminal from the APON subsystem to the integrated optical network unit of the DSLAM subsystem is wiring transmission, and the ADSL Modem equipment from the integrated optical network unit of the DSLAM subsystem to a user is twisted-pair lead-in transmission.
5. The distributed asymmetric digital subscriber line broadband optical access system of claim 1, wherein: the network management and control subsystem is distributed in each physical component of the access network system and comprises the following parts: an Optical Line Terminal (OLT) controller, a network management database server, a client workstation and a data communication network.
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| CN02116549A CN1450785A (en) | 2002-04-05 | 2002-04-05 | Distributed asymmetrical digital user line broadband optical fiber insertion system |
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| CN02116549A CN1450785A (en) | 2002-04-05 | 2002-04-05 | Distributed asymmetrical digital user line broadband optical fiber insertion system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007115436A1 (en) * | 2006-04-12 | 2007-10-18 | Yfc-Boneagle Electric Co., Ltd. | Group wiring system allowing locating of wire pairs and method for locating wire pairs in group wiring system |
| CN100385871C (en) * | 2005-09-20 | 2008-04-30 | 华为技术有限公司 | A Broadband Access System |
| CN100417082C (en) * | 2005-06-30 | 2008-09-03 | 华为技术有限公司 | Method for Terminal Management of Ethernet-Based Passive Optical Network |
| CN100448213C (en) * | 2007-01-17 | 2008-12-31 | 陈勇 | HFC network wideband access system based on MoCA technology |
| WO2009030161A1 (en) * | 2007-08-31 | 2009-03-12 | Huawei Technologies Co., Ltd. | Backward compatible pon coexistence |
| CN1859585B (en) * | 2005-12-30 | 2010-04-14 | 华为技术有限公司 | Broadband user access processing method and device, and user interface board |
| US7860029B2 (en) | 2004-02-26 | 2010-12-28 | Nec Corporation | Subscriber line accommodation device and packet filtering method |
| CN1929433B (en) * | 2005-09-09 | 2011-04-13 | 华为技术有限公司 | Method and system for interconnection of broad band stationary wireless access-in network and digital user wire network |
| CN101312449B (en) * | 2007-05-25 | 2011-06-08 | 魏建才 | Synthetic access equipment |
| CN1929430B (en) * | 2005-09-09 | 2011-07-20 | 华为技术有限公司 | Method, device and system for interconnection of broad band stationary wireless switch-in network and digital user wire network |
| CN101610437B (en) * | 2009-07-15 | 2012-11-07 | 浪潮电子信息产业股份有限公司 | Full-service access method based on optical fibers and coaxial cable |
| CN104394031A (en) * | 2014-11-13 | 2015-03-04 | 华为软件技术有限公司 | Method and device for forecasting access rate of broadband network |
| CN105122834A (en) * | 2013-03-05 | 2015-12-02 | 英国电讯有限公司 | Communications network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7860029B2 (en) | 2004-02-26 | 2010-12-28 | Nec Corporation | Subscriber line accommodation device and packet filtering method |
| CN100417082C (en) * | 2005-06-30 | 2008-09-03 | 华为技术有限公司 | Method for Terminal Management of Ethernet-Based Passive Optical Network |
| CN1929430B (en) * | 2005-09-09 | 2011-07-20 | 华为技术有限公司 | Method, device and system for interconnection of broad band stationary wireless switch-in network and digital user wire network |
| CN1929433B (en) * | 2005-09-09 | 2011-04-13 | 华为技术有限公司 | Method and system for interconnection of broad band stationary wireless access-in network and digital user wire network |
| CN100385871C (en) * | 2005-09-20 | 2008-04-30 | 华为技术有限公司 | A Broadband Access System |
| CN1859585B (en) * | 2005-12-30 | 2010-04-14 | 华为技术有限公司 | Broadband user access processing method and device, and user interface board |
| WO2007115436A1 (en) * | 2006-04-12 | 2007-10-18 | Yfc-Boneagle Electric Co., Ltd. | Group wiring system allowing locating of wire pairs and method for locating wire pairs in group wiring system |
| CN100448213C (en) * | 2007-01-17 | 2008-12-31 | 陈勇 | HFC network wideband access system based on MoCA technology |
| CN101312449B (en) * | 2007-05-25 | 2011-06-08 | 魏建才 | Synthetic access equipment |
| WO2009030161A1 (en) * | 2007-08-31 | 2009-03-12 | Huawei Technologies Co., Ltd. | Backward compatible pon coexistence |
| US8855490B2 (en) | 2007-08-31 | 2014-10-07 | Futurewei Technologies, Inc. | Backward compatible PON coexistence |
| CN101610437B (en) * | 2009-07-15 | 2012-11-07 | 浪潮电子信息产业股份有限公司 | Full-service access method based on optical fibers and coaxial cable |
| CN105122834A (en) * | 2013-03-05 | 2015-12-02 | 英国电讯有限公司 | Communications network |
| CN105122834B (en) * | 2013-03-05 | 2018-11-30 | 英国电讯有限公司 | The method of communication network and operation communication network |
| US11018771B2 (en) | 2013-03-05 | 2021-05-25 | British Telecommunications Public Limited Company | Communications network |
| CN104394031A (en) * | 2014-11-13 | 2015-03-04 | 华为软件技术有限公司 | Method and device for forecasting access rate of broadband network |
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