Multiplex communications – Wide area network – Packet switching
Patent
1979-05-21
1981-12-01
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
370 50, 370 74, H04J 400, H04J 105
Patent
active
043040004
ABSTRACT:
To supervise the operation of an arithmetic unit of a digital transmultiplexer intended to convert a TDM-signal into a FDM-signal and vice versa, a pilot signal is utilized as the test signal which pilot signal is also used to control the level of the received FDM-signals and is processed in the transmultiplexer. The pilot signal selection filter used for controlling the level is used, also in time-division multiplex, for selecting a component having a frequency equal to the pilot signal frequency and occurring in each of the two input and output signals of the arithmetic unit.
REFERENCES:
patent: 4009350 (1977-02-01), Cabet
patent: 4074073 (1978-02-01), Eldsmo
patent: 4101738 (1978-07-01), Bellanger
Bonnerot Georges
Coudreuse Michel
Senn Patrice
Briody Thomas A.
Stewart David L.
Streeter William J.
Telecommunications Radioelectriques et Telephoniques T.R.T.
Wright Laurence A.
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