This patent application is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The collection and exchange of diagnostic and test information between transceivers in a telecommunications environment is an important part of a telecommunications, such as an ADSL, deployment. In cases where the transceiver connection is not performing as expected, for example, where the data rate is low, where there are many bit errors, or the like, it is necessary to collect diagnostic and test information from the remote transceiver. This is performed by dispatching a technician to the remote site, e.g., a truck roll, which is time consuming and expensive.
"In DSL technology, communications over a local subscriber loop between a central office and a subscriber premises is accomplished by modulating the data to be transmitted onto a multiplicity of discrete frequency carriers which are summed together and then transmitted over the subscriber loop. Individually, the carriers form discrete, non-overlapping communication subchannels of limited bandwidth. Collectively, the carriers form what is effectively a broadband communications channel. At the receiver end, the carriers are demodulated and the data recovered.
"DSL systems experience disturbances from other data services on adjacent phone lines, such as, for example, ADSL, HDSL, ISDN, T1, or the like. These disturbances may commence after the subject ADSL service is already initiated and, since DSL for internet access is envisioned as an always-on service, the effect of these disturbances must be ameliorated by the subject ADSL transceiver."
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventor's summary information for this patent application: "Identifying, measuring and characterizing the condition of a transmission line is a key element of an ADSL deployment. In cases when the transceiver connection is not performing as expected, for example, the data rate is low, there are many bit errors, a data link is not possible, or the like, it is important to be able to identify the loop length and the existence, location and length of any bridged taps without having to send a technician to the remote modem site to run diagnostic tests.
"This invention describes a system and method for estimating the loop length, the number of bridged taps and length of the bridged taps on a transmission line from readily available modem data. The loop length, the number of bridge taps and the length of the bridged taps can be estimated by comparing a measured frequency domain channel impulse response of the transmission line to a model of a transmission line that is composed of multiple sections and multiple bridge taps. The diagnostic and test information describing the condition of the line can then be exchanged, for example, by two transceivers during a diagnostic link mode, such as that described in U.S. patent application Ser. No. 09/755,173 filed
"These and other features and advantages of this invention are described in or are apparent from the following detailed description of the embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
"The embodiments of the invention will be described in detail, with reference to the following figures wherein:
"FIG. 1 illustrates an exemplary multiple section loop with multiple bridged taps;
"FIG. 2 illustrates a graph of the measured received reverb signal and the theoretical model for downstream data;
"FIG. 3 illustrates a graph of the measured received reverb signal and the theoretical model for upstream data;
"FIG. 4 is a functional block diagram illustrating an exemplary loop length and bridged tap length estimation system according to this invention;
"FIG. 5 is a flowchart outlining an exemplary general method for determining loop length and bridged tap lengths according to this invention;
"FIG. 6 is a flowchart outlining an exemplary method for estimating the loop length and bridged tap length in the upstream direction according to this invention; and
"FIG. 7 is a flowchart outlining an exemplary method for estimating the loop length and bridged tap length in the downstream direction according to this invention."
URL and more information on this patent application, see: Belge, Murat. Systems and Methods for Loop Length and Bridged Tap Length Determination of a Transmission Line. Filed
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