Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
1997-12-31
2002-03-19
Yao, Kwang B. (Department: 2664)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S403000, C370S543000
Reexamination Certificate
active
06359881
ABSTRACT:
FIELD OF THE INVENTION
This invention discloses an architecture for supporting increased bandwidth to customer premises equipment allowing for increased services including videophone, analog and digital voice traffic, facsimile, voice mail, Internet traffic, and automated home services relating to meter reading, security, and energy management.
BACKGROUND
As deregulation of the telephone industry continues and as companies prepare to enter the local telephone access market, there is a need to offer new and innovative services that distinguish common carriers from their competitors. This cannot be accomplished without introducing new local access network architectures that will be able to support these new and innovative services.
Conventionally, customer premises telephone and/or data connections contain splitters for separating analog voice calls from other data services such as Ethernet transported over digital subscriber line (DSL) modems. Voice band data and voice signals are sent through a communications switch in a central or local office to an interexchange carrier or Internet service provider. DSL data is sent through a digital subscriber loop asynchronous mode (DSLAM) switch which may include a router. The DSLAM switch connects many lines and routes the digital data to a telephone company's digital broadband switch.
A major problem with this configuration is that as the interexchange carriers attempt to penetrate the local telephone company's territory, they must lease trunk lines from the local telephone company switch to the interexchange company's network for digital traffic. Furthermore, the Internet service provider must lease a modem from the local phone company in the DSLAM switch and route its data through the local phone company's digital broadband switch. Thus, the local phone company leases and/or provides a significant amount of equipment, driving up the cost of entry for any other company trying to provide local telephone services and making it difficult for the interexchange companies to differentiate their services. Furthermore, since DSL modem technology is not standardized, in order to ensure compatibility, the DSL modem provided by the local telephone company must also be provided to the end user in the customer premises equipment (CPE). Additionally, since the network is not completely controlled by the interexchange companies, it is difficult for the interexchange companies to provide data at committed delivery rates. Any performance improvements implemented by the interexchange companies may not be realized by their customers, because the capabilities of the local telephone company equipment may or may not meet their performance needs. Thus, it is difficult for the interexchange companies to convince potential customers to switch to their equipment or to use their services. These factors ensure the continued market presence of the local telephone company.
As part of this system, there is a need for improved architectures, services and equipment utilized to distinguish the interexchange companies' products and services. The existing copper twisted pair infrastructure limits the number of users on the twisted pair and the bandwidth transmitted. A method for expanding the number of simultaneous users and the bandwidth without replacing the existing twisted pair infrastructure is desired. In increasing the bandwidth and the number of simultaneous services transmitted over a single twisted pair will allow service providers an opportunity to expand and enhance services into consumers' homes and business operations while minimizing the incremental costs associated with initiating enhanced, new services.
In the process of providing enhanced, new services, it is desired for the service provider to offer fault tolerant, transparent interfaces for the user. Because of the need to keep costs minimized flexibility for using existing hardware and software systems is important. Therefore, it is also desired that the fault tolerant services offered be flexible to interface across multiple lines of hardware and various versions of software.
SUMMARY OF THE INVENTION
In order to provide an improved network it is desirable for the interexchange companies to have access to at least one of the twisted-pair lines or alternate wireless facility connecting each of the individual users to the local telephone network before the lines are routed through the conventional local telephone network equipment. It is preferable to have access to these lines prior to the splitter and modem technology offered by the local service providers. By having access to the twisted-pair wires entering the customer's premises, interexchange companies can differentiate their services by providing higher bandwidth, improving the capabilities of the customer premises equipment, and lowering overall system costs to the customer by providing competitive service alternatives.
The new architecture may utilize a video phone and/or other devices to provide new services to an end user; an intelligent services director (ISD) disposed near the customer's premises for multiplexing and coordinating many digital services onto a single twisted-pair line; a facilities management platform (FMP) disposed in the local telephone network's central office or DLC vault for routing data to an appropriate interexchange company network; and a network server platform (NSP) coupled to the FMP for providing new and innovative services to the customer and for distinguishing services provided by the interexchange companies from those services provided by the local telephone network.
The overall architecture of the system includes a hybrid optical fiber/twisted pair infrastructure functionally coupling the customer premises equipment to the facilities management platform by twisted pair operating xDSL technology. The utilization of xDSL technology increases the bandwidth to the customer premises equipment and allows for the offering of simultaneous services along the same twisted pair.
The facilities management platform is functionally coupled to a communication network and is supported by a network server platform. Typically, the facilities management platform is located at the local office, while the network server platform is located in a separate location due to space limitations, regulator considerations and/or costs at the local office. The architecture provides variable bandwidth channels, depending on the service requested by the subscriber, and may be dynamically adapted for providing requested services in both directions of transmission. Voice and data are intelligently multiplexed in order to maximize the available bandwidth of the twisted pair.
The facilities management platform supports both fiber and wire connections into the local telephone company's communication network, cable television network, Internet service provider's network or into a wireless communication's network.
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Gerszberg Irwin
Miller II Robert Raymond
Romain Dennis Matthew
Russell Jesse Eugene
Treventi Philip Andrew
AT&T Corp.
Yao Kwang B.
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