Claims
- 1. A system for testing a line of a communication network for a digital subscriber line service, comprising:a test waveform generator, for connection to a transmit-side of the line; a waveform sampler, for connection to a receive-side of the line, for sampling a test waveform received through the line from the generator; and a processor, coupled to the waveform sampler and responsive to the sample of the received test waveform, for determining a set of eigenvalues characterizing a transfer function of the transmission line and for comparing the eigenvalues to threshold values corresponding to an acceptable transfer function of the transmission line.
- 2. A system as in claim 1, wherein the test waveform generator comprises a generator for generating a waveform corresponding to the digital subscriber line service selected from waveforms corresponding to a plurality of digital subscriber line services available on the communication network.
- 3. A system as in claim 1, wherein the processor comprises a programmable central processing unit.
- 4. Apparatus comprising in combination:a communication network for providing telephone service and digital subscriber line data service over a plurality of subscriber line circuits; and line test means, selectively coupled to one of the subscriber line circuits, for measuring signals transmitted over the one subscriber line circuit, determining a set of eigenvalues in response to the signal measurement and comparing the set eigenvalues to threshold values characterizing an acceptable line transfer function for the digital subscriber line data service.
- 5. Apparatus as in claim 4, wherein the digital subscriber line data service comprises an asynchronous digital subscriber line (ADSL) service.
- 6. Apparatus as in claim 4, wherein the line test means comprises a test waveform generator for transmission of a test waveform over the one subscriber line circuit, and a waveform sampler for digitizing signals from the one subscriber line circuit and capturing digital samples for a waveform received from the one subscriber line circuit.
- 7. Apparatus as in claim 6, wherein the line test means further comprises a computer system in communication with the waveform sampler for processing digital samples corresponding to the captured digital samples to determine the eigenvalues.
- 8. Apparatus as in claim 4, wherein the communication network comprises a local exchange carrier telephone network.
- 9. Apparatus as in claim 8, wherein the subscriber line circuits comprise twisted pair telephone line circuits.
Parent Case Info
This application is a continuation of application Ser. No. 09/234,464 filed Jan. 21, 1999.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5181198 |
Lechleider |
Jan 1993 |
A |
5870432 |
Kerckhove |
Feb 1999 |
A |
6215855 |
Schneider |
Apr 2001 |
B1 |
Non-Patent Literature Citations (1)
Entry |
Farhang-Boroujeny et al, An eigen-approach to the design of near-optimum time domain equalizer for DMT transceivers, Copyrighted 1999, IEEE, pp. 937-941. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/234464 |
Jan 1999 |
US |
Child |
09/660395 |
|
US |