Multiplex communications – Diagnostic testing
Reexamination Certificate
1999-11-09
2001-09-18
Jung, Min (Department: 2739)
Multiplex communications
Diagnostic testing
C379S027010
Reexamination Certificate
active
06292468
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method for qualifying a local loop for digital subscriber line (DSL) service.
BACKGROUND ART
xDSL is a generic term for digital subscriber line equipment and services, including packet-based architectures, such as ADSL, HDSL, SDSL, VDSL, and RADSL. That is, x is the generic. xDSL technologies provide extremely high bandwidth over embedded twisted pair, copper cable plant. xDSL technologies offer great potential for bandwidth-intensive applications, such as Internet access, remote LAN access, video conferencing, and video-on-demand.
ADSL or asymmetric digital subscriber line services generally use existing unshielded twisted pair (UTP) copper wires from the telephone company's central office to the subscriber's premise, utilize electronic equipment in the form of ADSL modems at both the central office and the subscriber's premise, send high-speed digital signals up and down those copper wires, and send more information one way than the other. The ADSL flavor of xDSL services is capable of providing a downstream bandwidth of about 1.5 Mbps-6.144 Mbps, and an upstream bandwidth of about 32 Kbps-640 Kbps with loop distances ranging from about 3.7 km-5.5 km. HDSL or high bit rate digital subscriber line services provide a symmetric, high-performance connection over a shorter loop, and typically require two or three copper twisted pairs. HDSL is capable of providing both upstream and downstream bandwidth of about 1.5 Mbps, over loop distances of up to about 3.7 km. SDSL or single line digital subscriber line services provide a symmetric connection that matches HDSL performance using a single twisted pair, but operating over a shorter loop of up to about 3.0 km. VDSL or very high bit rate digital subscriber line services are typically implemented in asymmetric form, as a very high speed variation on the ADSL theme over a very short loop. Specifically, target downstream performance is typically about 52 Mbps over UTP local loops of 300 m, 26 Mbps at 1,000 m, and 13 Mbps at 1,500 m. Upstream data rates in asymmetric implementations tend to range from about 1.6 Mbps to about 2.3 Mbps. Additionally, there is RADSL or rate adaptive digital subscriber line services. RADSL provides a dynamic connection that adapts to the length and quality of the line.
In the xDSL family of services, many xDSL themes, including ADSL, HDSL, SDSL, VDSL, and RADSL, utilize a packet-based approach that does away with the line-grabbing practice of circuit switched networks, such as ISDN (although ISDN service is a form of digital subscriber line). This packet-based approach is very advantageous in a variety of situations, such as high-speed data services, including high definition television or HDTV transmissions.
Of course, xDSL services, also commonly referred to as simply DSL or digital subscriber line services, are much more dependent on line conditions than traditional telephone services. Traditional telephone services typically use a bandwidth including frequencies up to about 3 kilohertz, while the DSL services utilize a bandwidth including frequencies up into the hundreds of kilohertz. While some local loops are in great condition for implementing DSL services, that is, the local loops have short to moderate lengths with minimal bridged taps and splices, many local loops are not as clean. For example, local loop length vary widely, for example, from as short as a few hundred meters to as long as several kilometers.
Further, sometimes the wire gauge for a local loop is not continuous over the length of the loop. That is, a portion of the local loop may be one wire gauge, while an adjacent portion of the local loop has a different wire gauge, with the two portions being spliced together. Still further, many existing local loops have one or more bridged taps. A bridged tap is a length of wire pair that is connected to a loop at one end and is unterminated at the other end. Sometimes, an existing local loop will have several bridged taps so that the telephone company may connect a customer to any one of the taps (while leaving the other taps unterminated). Tapped lines may allow the telephone company to better utilize its copper cable plant distribution. For example, a particular service area may include 25 residences. Because not all residences require multiple phone lines, there may be a total of about 30 or 35 local loops, with some of the loops having multiple bridged taps. As such, it may be possible for any one of the residences to order multiple line service, so long as only a few of the residences do so.
Because DSL services have a strong dependence on line conditions, not all existing loops are qualified for DSL service. Previously, a customer would call his/her service provider and inquire as to whether or not the customer's loop supported DSL service. The customer service representative would perform a database look-up on the customer's line and evaluate their ability to receive service. The customer service representative could also test the circuit using voice band measurement techniques. However, the database records are not always reliable, and results of voice band testing are not always an accurate indicator of DSL qualification because DSL service uses much higher frequencies than voice service. Further, when database look-up and/or voice band measurements are used to determine DSL qualification, sometimes, after the customer has purchased DSL equipment, it is discovered that the line quality is not as good as anticipated in that either DSL support is unavailable, or the customer is left with less than desirable bandwidth capabilities.
For the foregoing reasons, there is need for an improved way for the customer to determine whether or not a local loop is qualified for DSL service.
DISCLOSURE OF INVENTION
It is, therefore, an object of the present invention to provide a method for qualifying a local loop for digital subscriber service that utilizes a test device at the customer end of the loop to measure test signals originating at the provider end of the loop.
In carrying out the above object, a method for qualifying a local loop for digital subscriber line service is provided. The loop has a provider end and a customer end. The method comprises connecting a test device to the customer end of the loop. The device includes processing logic. The method further comprises sending a loop qualification test signal to the device, and measuring the test signal as received at the device with the processing logic. The test signal originates at the provider end of the loop. Further, an output for the loop qualification test is generated based on the measurement.
In one implementation, the method further comprises requesting the sending of the test signal. The test signal is requested by calling a voice response unit (VRU). A test signal generator is connected to the provider end of the loop in response to the request.
In some embodiments, sending the test signal further comprises sending a plurality of tones to the device. In some embodiments, sending the test signal further comprises sending at least one tone using quadrature amplitude modulation (QAM). Further, in some QAM embodiments, sending the at least one tone further comprises sending a first tone using M-ary quadrature amplitude modulation wherein M has a first value, and sending a second tone using M-ary quadrature amplitude modulation wherein M has a second value that is different than the first value.
In some embodiments, measuring the test signal further comprises measuring a signal to noise ratio of the test signal. In some embodiments, measuring the test signal further comprises measuring a power level of the test signal. Further, some embodiments generate the output as a value on a gradient scale, for example, using at least one light emitting diode (LED). Advantageously, some of the test devices made in accordance with the present invention are powered by the loop current. Alternatively, a test device may be battery powered. Still further, some embodiments o
Brooks & Kushman P.C.
Jung Min
Qwest Communications International Inc.
LandOfFree
Method for qualifying a loop for DSL service does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for qualifying a loop for DSL service, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for qualifying a loop for DSL service will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2494886