Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
1999-07-30
2003-10-07
Nguyen, Chau (Department: 2663)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S466000, C375S222000
Reexamination Certificate
active
06631120
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates in general to data communication, and more particularly to determining a communication protocol of a communication device operating on digital subscriber lines.
BACKGROUND OF THE INVENTION
Traditional telephone networks are designed to provide voice transmissions, and performs this function well. In general, however, the existing telephone networks are not adept at high speed data transmission. Digital Subscriber Line technology (DSL) uses existing twisted pair telephone lines to transport high bandwidth data, such as multimedia, video on demand, and Internet access, to data service subscribers. DSL technology uses a DSL transceiver unit (e.g. modems, splitters, and other communication equipment) at the central office of the data services provider and at the subscriber premises to utilize a greater range of frequencies of the telephone line than traditional telephone services, resulting in high speed data transmission.
To receive data services, therefore, a subscriber must install the proper communication equipment at the subscriber premises to support transmitting and receiving data using DSL technology over the existing telephone lines. Under certain circumstances, even a subscriber having the proper communication equipment may be unable to receive data services using particular DSL technologies. Since the communication equipment required at the subscriber premises may be expensive and the quality of data services received is uncertain, a potential data services subscriber may request from the data services provider an estimate of the data rate capacity of the telephone line servicing the potential subscriber before installing the communication equipment.
The data rate capacity of an existing telephone line generally defines the maximum throughput of the telephone line and typically depends on a number of factors. For example, the data rate capacity of a particular telephone line depends on the length of the telephone line, the gauge of wiring used in the telephone line, and the number and type of noise or interference producing elements present near the telephone line. A typical telephone line may be arranged in one or more binder group segments. In general, a binder group segment comprises a collection of telephone lines that share a common sheath. Each of the factors which affects the data rate capacity of a particular telephone line may vary among the different binder group segments of that telephone line. In addition, the provisioning of data services to a subscriber premises over a telephone line in a particular binder group may contribute to the noise and distortion upon other telephone lines within the same binder group, thereby degrading the services already provided to other subscriber premises.
Due to the number of factors affecting the data rate capacity of a particular telephone line, data services providers often cannot provide an accurate estimate of the data rate capacity to a potential subscriber. In some cases, a data services provider may perform a “truck roll”—the dispatch of a service technician to install communication equipment or to configure the telephone line at the customer premises—to determine the data rate capacity of a particular telephone line. A truck roll, however, is time consuming and cost prohibitive for the data services provider and the subscriber.
SUMMARY OF THE INVENTION
In accordance with the present invention, a system for determining a communication protocol of a communication device operating on digital subscriber lines is provided which substantially eliminates or reduces disadvantages and problems associated with previous communication systems.
In accordance with one embodiment of the present invention, a system for determining a communication protocol of a communication device operating on a twisted pair subscriber line includes a communication server that couples to a number of subscribers using a number of subscriber lines. The communication server comprises a first communication device that communicates with a second communication device using a particular subscriber line. A processor coupled to the communication server determines that the first communication device is inoperable to communicate with the second communication device using a first communication protocol. In response, the processor initiates the operation of the first communication device using a second communication protocol.
Another embodiment of the present invention is a method for determining a communication protocol of a communication device operating on a twisted pair subscriber line. The method includes identifying a first communication device of a communication server coupled to a second communication device using a particular subscriber line. The method continues by determining that the first communication device is inoperable to communicate with the second communication device using a first communication protocol. The method concludes by initiating the operation of the first communication device using a second communication protocol.
Technical advantages of the present invention include a system for determining the data rate capacity of a twisted pair subscriber line that includes a communication server, a memory, and a processor. The memory stores attenuation information, noise information, or any other subscriber line information for a plurality of subscriber lines. The processor determines the data rate capacity of a selected subscriber line using the attenuation information and the noise information. In this respect, a data services provider in the system may pre-provision data rates for the subscriber line of a subscriber prior to activating data services for the communication equipment at the subscriber premises.
An important advantage of the system is that the communication server includes one or more communication devices that support determining subscriber line information while providing data services to subscribers during operation. The processor collects the subscriber line information from the communication server for storage in the memory. In this respect, the processor may collect subscriber line information from a number of communication servers in the system.
Another advantage of the system is that the memory can store attenuation information for a particular subscriber line based upon the constituent binder group segments of the subscriber line. The processor may then determine the attenuation information of a selected subscriber line according to the attenuation characteristics contributed by each of its constituent binder group segments. In this respect, the system may more accurately determine the data rate capacity of a selected subscriber line.
Another advantage of the present invention is a system for determining the transmit power of a communication device operating on a subscriber line of the system. The system includes a communication server having a communication device that operates on the subscriber line, a memory, and a processor. The memory stores noise information and cross-channel-coupling information for a plurality of subscriber lines in the system. The processor determines the transmit power of the communication device based upon the noise information and the cross-channel-coupling information. By determining the optimal transmit power of a communication device, the system may provide data services to a subscriber that does not degrade the data services provided to other subscribers.
A further advantage provided by the present invention is that the system may select a communication protocol for the communication device that is best adapted to provided the determined transmit power spectrum. In some instances when the communication device is inoperable to communicate data using a first communication protocol, such as an xDSL communication protocol, the system may operate the communication device using an alternative communication protocol, such as a V-series communication protocol. In this respect, a subscriber of the system is less likely to suffer a loss of
Cisco Technology Inc.
George Keith M.
Nguyen Chau
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