Multiplex communications – Pathfinding or routing – Through a circuit switch
Reexamination Certificate
2005-11-15
2005-11-15
Pezzlo, John (Department: 2662)
Multiplex communications
Pathfinding or routing
Through a circuit switch
C370S535000
Reexamination Certificate
active
06965596
ABSTRACT:
μ-law-to-A-law translating equipment is used for plural PCM telephone lines installed between countries different in a conversion law. This translating equipment is provided with plural μ-law signal receiving circuits, a multiplexer, a μ-law-to-A-law converter, a demultiplexer, plural A-law signal output circuits and a timing pulse generator. Each μ-law signal receiving circuit outputs parallel μ-law PCM signals synchronized with a reference frame pulse and the multiplexer time-division multiplexes these signals according to a time division system. The μ-law-to-A-law converter outputs a time-division multiplexed A-law PCM signal, the demultiplexer demultiplexes this time-division multiplexed signal and outputs plural parallel A-law PCM signals. The A-law signal output circuit outputs a serial A-law PCM signal to which a frame bit is added.
REFERENCES:
patent: 4535451 (1985-08-01), Drupsteen
patent: 4595907 (1986-06-01), Huffman et al.
patent: 5060227 (1991-10-01), Finley et al.
patent: 6240179 (2001-05-01), Balatoni et al.
patent: 6553026 (2003-04-01), Aihara
patent: 6747988 (2004-06-01), Jordan et al.
patent: 50-3204 (1975-01-01), None
patent: 61-1194 (1986-01-01), None
patent: 3-50997 (1991-03-01), None
Japanese Office Action dated Mar. 23, 2004 with English translation of pertinent portions.
Mills Donald L
NEC Corporation
Pezzlo John
LandOfFree
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