Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent
1995-12-22
1998-03-24
Chin, Wellington
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of trunk or long line
379350, 370241, 370522, 375228, H04K 100
Patent
active
057321248
ABSTRACT:
An apparatus and method are provided for determining the activity status of a PCM channel in a telecommunications system. The method (600-680) and apparatus (400) utilize a codec (220) within the PCM channel which converts an analog signal to a digital signal and converts a digital signal to an analog signal. Within the apparatus (400), a memory register (402) is coupleable to the codec (220) to repeatedly obtain and store a digital byte of a plurality of digital bytes from the PCM channel. A processor (404) coupled to or containing the memory register (402) repeatedly, for a predetermined period of time, determine whether an ordered arrangement of bits of a digital byte has a predetermined bit pattern and accumulate a count of digital bytes having the predetermined bit pattern. The processor (404) then determines whether the accumulated count is greater than a predetermined value and provides a notification indicating the status of the PCM channel.
REFERENCES:
patent: 4477900 (1984-10-01), Gruenberg
patent: 4805171 (1989-02-01), Ewell
patent: 4928306 (1990-05-01), Biswas et al.
patent: 5007050 (1991-04-01), Kasparian et al.
patent: 5598401 (1997-01-01), Blackwell et al.
Harris Joseph L.
Nelson David Paul
Chin Wellington
Corrielus Jean B.
Gamburd Nancy R.
Motorola Inc.
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