Martin S Herzlinger

US Patent:

52992578, Mar 29, 1994

Filed:

Feb 21, 1992

Appl. No.:

7/839975

Inventors:

Richard C. Fuller - Fair Haven NJ
Thomas W. Goeddel - Fair Haven NJ
R. B. Heick - Red Bank NJ
Martin Herzlinger - Freehold NJ
Subramanian Krishnamurthy - Middletown NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04M 1100
H04M 124

US Classification:

379100

Abstract:

Non-intrusive monitoring and analysis of real-time facsimile transmissions is accomplished. Analog impairment measurements are made on the high speed page signal in those transmissions and protocol analysis is made on the low speed control messages in those transmissions. These measurements and analysis are a powerful tool for trouble shooting service problems afflicting facsimile transmissions. Actual customer traffic can be monitored to detect circuit impairments and to evaluate service being provided. Customer complaints can be handled by providing them with a special phone number which may be called to provide the ability to have the facsimile transmission experiencing a problem specially directed through the facsimile analyzer and forwarded to the intended destination while it is being non-intrusively monitored by service personnel who then can quickly provide the customer with a diagnosis of the problem.

US Patent:

54901995, Feb 6, 1996

Filed:

Feb 21, 1992

Appl. No.:

7/839972

Inventors:

Richard C. Fuller - Fair Haven NJ
Thomas W. Goeddel - Fair Haven NJ
R. B. Heick - Red Bank NJ
Martin Herzlinger - Freehold NJ
Subramanian Krishnamurthy - Middletown NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

H04M 1100
H04M 124

US Classification:

379 1

Abstract:

Non-intrusive monitoring and analysis of real-time facsimile transmissions is accomplished. Analog impairment measurements are made on the high speed page signal in those transmissions and protocol analysis is made on the low speed control messages in those transmissions. These measurements and analysis are a powerful tool for trouble shooting service problems afflicting facsimile transmissions. Real customer traffic can be monitored to detect circuit impairments and to evaluate service being provided. A selected incoming trunk of a central office switch is accessed and a monitoring function with respect to that trunk is established. A signal classification operation is performed, which identifies the presence of a facsimile transmission and what kind of facsimile transmission it is. When the classification operation has determined the presence and nature of a facsimile transmission, a series of non-intrusive impairment measurements is made using the page information sent in the course of the facsimile transmission. Analog transmission impairments are identified along with signal to noise performance.