Interactive measurement system and method for telecommunication networks

• US 5,875,230 A
• Filed: 12/20/1996
• Issued: 02/23/1999
• Est. Priority Date: 12/20/1996
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Ramsden, David Beaumont, Habib, Abubaker I., Ganley, John Thomas, Mollica, Allen J.
• Primary Examiner(s): Kuntz, Curtis A.
• Assistant Examiner(s): Barnie, Rexford N.
• Application Number:
  US08/771,729
• Time in Patent Office: 795 Days
• Field of Search: 379/24, 379/1, 379/3, 379/5, 379/9, 379/12, 379/22, 379/23, 379/27, 379/29, 379/19, 379/21, 379/406, 379/410, 379/26, 379/6, 379/10, 370/242, 370/247, 370/249, 324/600, 324/614, 324/654
• US Class Current: 379/1.02
• CPC Class Codes: H04M 3/30 for subscriber's lines , for the local loop

Abstract

A measurement system and method for a telecommunication systems diagnoses problems within a communication line. The measurements are performed both non-intrusively and intrusively in an interactive manner, and evaluate the transmission quality of the communication line through to the subscriber'"'"'s telephone set.

Claims

1. A method for diagnosing problems in a communication line between a technician and a subscriber having a voice transceiver, within a communication system, comprising the steps of:

(a) initiating a call on the communication line between the technician and the subscriber;

(b) measuring, quantitatively, parameters of transmissions on the communication line through to the subscriber'"'"'s voice transceiver while the call is in progress, the measured parameters include at least one of;

(i) a signal level of the subscriber'"'"'s voice;

(ii) a noise level in the communication line during silence between the subscriber'"'"'s voice;

(iii) a first echo level in the communication line by using the technician'"'"'s voice as a test signal;

(iv) a loop noise level in the communication line while the subscriber mutes background noise at subscriber'"'"'s premise;

(v) a second echo level in the communication line while the subscriber mutes background noise at subscriber'"'"'s premise; and

(vi) a loop loss level in the communication line based on dual tone multi-frequency (DTMF) digits selected by the subscriber; and

(c) evaluating the measured parameters to diagnose problems in the communication line.

2. An apparatus for diagnosing problems in a communication line between a technician and a subscriber having a voice transceiver, within a communication system, comprising:

a signal processor connected within the communication line between the technician and the subscriber, said signal processor quantitatively measures parameters of transmissions on the communication line through to the subscriber'"'"'s voice transceiver while a call between the technician and the subscriber is in progress, said signal processor evaluates the measured parameters to diagnose problems in the communication line; and

a private branch exchange (PBX) connected to said signal processor, said PBX routes a call from the technician to said signal processor.

3. The apparatus of claim 2, further comprising:

a control processor connected to said signal processor, the technician controls said signal processor through said control processor.

4. The apparatus of claim 2, further comprising:

an interface board connecting said signal processor and said private branch exchange.

5. The apparatus of claim 4, further comprising:

a data bus connecting said interface board and said signal processor.

6. The apparatus of claim 5, wherein control processor is connected to said data bus.

7. A method for diagnosing problems in a communication line between a technician and a subscriber having a voice transceiver, within a communication system, comprising the steps of:

(a) initiating a call on the communication line between the technician and the subscriber;

(b) measuring, quantitatively, parameters of transmissions on the communication line through to the subscriber'"'"'s voice transceiver while the call is in progress; and

(c) evaluating the quantitatively measured parameters to diagnose problems in the communication line.

8. The method of claim 7, wherein:

the parameters of transmission measured quantitatively in said measuring step (b) includes an average trunk noise level and an average audible ring level of the call before the subscriber goes off-hook;

said evaluating step (c) including identifying, when the average trunk noise level and the average audible ring level do not satisfy a first predetermined criteria, the problems as being located in trunk circuits within the communication line leading up to an end-office switch.

9. The method of claim 8, wherein:

the parameters of transmission measured quantitatively in said measuring step (b) includes an average speech level and an average background noise level of the call;

said evaluating step (c) including identifying, when;

(i) when the average trunk noise level and the average audible ring level satisfy the first predetermined criteria, and

(ii) the average speech level and the average background noise level do not satisfy a second predetermined criteria,

the problems as being located in subscriber loop or the voice transceiver within the communication line.

10. The method of claim 9, wherein:

the parameters of transmission measured quantitatively in said measuring step (b) includes an loop noise level of the call while the subscriber mutes background noise;

said evaluating step (c) including identifying, when;

(i) when the average trunk noise level and the average audible ring level satisfy the first predetermined criteria,

(ii) the average speech level and the average background noise level satisfy the second predetermined criteria, and

(iii) the loop noise level does not satisfy a third predetermined criteria,

the problems as being located in subscriber loop within the communication line.

11. The method of claim 10, wherein:

the parameters of transmission measured quantitatively in said measuring step (b) includes an echo level and a delay level of the call while the subscriber mutes background noise;

said evaluating step (c) including identifying when;

(i) when the average trunk noise level and the average audible ring level satisfy the first predetermined criteria,

(ii) the average speech level and the average background noise level satisfy the second predetermined criteria,

(iii) the loop noise level satisfies the third predetermined criteria, and

(iv) the echo level and the delay level does not satisfy a fourth predetermined criteria;

the problems as being located in the return loss characteristics of the subscriber'"'"'s connection within the communication line.

12. The method of claim 11, wherein:

the parameters of transmission measured quantitatively in said measuring step (b) includes an echo level and a delay level of the call while the subscriber mutes background noise;

said evaluating step (c) including identifying, when;

(i) when the average trunk noise level and the average audible ring level satisfy the first predetermined criteria,

(ii) the average speech level and the average background noise level satisfy the second predetermined criteria,

(iii) the loop noise level satisfies the third predetermined criteria,

(iv) the echo level and the delay level satisfy the fourth predetermined criteria; and

(v) the average touch-tone level fails does not satisfy a fifth predetermined criteria;

the problems as being located in the subscriber loop or the voice transceiver within the communication line.

13. The method of claim 7, wherein said measuring step (b) measures a signal level of an audible ring of the communication line before the subscriber answers.

14. The method of claim 7, wherein said measuring step (b) measures a trunk noise level in the communication line between audible rings before call answer by the subscriber.

15. The method of claim 7, wherein said measuring step (b) measures a signal level of transmissions of voice.

16. The method of claim 7, wherein said measuring step (b) measures a noise level in the communication line during silence between transmissions of voice.

17. The method of claim 7, wherein said measuring step (b) measures an echo level in the communication line by using voice of the technician as a test signal.

18. The method of claim 7, wherein said measuring step (b) measures a loop noise level in the communication line while the subscriber mutes background noise.

19. The method of claim 7, wherein said measuring step (b) measures an echo level in the communication line while the subscriber mutes background noise.

20. The method of claim 18, wherein the subscriber, at the direction of the technician, mutes background noise by covering a mouthpiece of the voice transceiver.

21. The method of claim 20, wherein the subscriber, at the direction of the technician, mutes background noise by covering a mouthpiece of the voice transceiver.

22. The method of claim 18, wherein the subscriber, at the direction of the technician, mutes background noise by selecting a mute feature of the voice transceiver.

23. The method of claim 20, wherein the subscriber, at the direction of the technician, mutes background noise by selecting a mute feature of the voice transceiver.

24. The method of claim 7, wherein said measuring step (b) measures loop loss in the communication line based on dual tone multi-frequency (DTMF) digits selected by the subscriber.