Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission
Patent
1992-02-21
1996-02-06
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of data transmission
379 34, 379 93, 379100, 379406, H04M 1100, H04M 124
Patent
active
054901995
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. Echo and delay measurements are also taken and the protocols are tracked. The measurement data is collected and analyzed to ascertain whether or not the facsimile transmission was normal. A diagnostic module uses the measurements to determine why any given transmission was abnormal.
REFERENCES:
patent: 4532554 (1985-06-01), Skala
patent: 4815136 (1989-03-01), Benvenuto
patent: 4815137 (1989-03-01), Benvenuto
patent: 4951156 (1990-08-01), Kotani et al.
patent: 4965676 (1990-10-01), Ejiri et al.
patent: 4979211 (1990-12-01), Benvenuto et al.
patent: 5041917 (1991-08-01), Koshiishi
patent: 5117453 (1992-05-01), Piasecki et al.
patent: 5193110 (1993-05-01), Jones et al.
patent: 5216519 (1993-06-01), Daggett et al.
patent: 5299257 (1994-03-01), Fuller et al.
Hewlett Packard Journal (In-Service Transmission Impairment Testing of Voice-Frequency Data Circuits), N. Carder et al. Oct. 1987, pp. 4-15.
Phamphlet entitled "Fax Call Analyser" by Rotadata Telecommunication Products, 11584 Goldcoast Drive, Blue Ash, Cincinnati, Ohio 45249.
Application Note For the FAX G3 Tester, "Procedures For The Operation Of The Tester And Communication Sequence Analysis", pp. 1-22.
"Test Results Sheet for AE-3107B FAX G3 Tester, No. 70146208," Ando Electric Co., Ltd., Tokyo, Japan, pp. 1-2.
"AS-84212-1 Instruction Manual For AE-3107B FAX G3 Tester," Ando Electric Co., Ltd., Tokyo, Japan, pp. 1-1-3-13.
Fuller Richard C.
Goeddel Thomas W.
Heick R. B.
Herzlinger Martin
Krishnamurthy Subramanian
AT&T Corp.
Chin Stephen
Indyk Eugene S.
Loomis Paul
Young Mark K.
LandOfFree
Non-intrusive network-based analysis of facsimile transmissions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Non-intrusive network-based analysis of facsimile transmissions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-intrusive network-based analysis of facsimile transmissions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2180874