Multiplex communications – Wide area network – Packet switching
Patent
1990-01-02
1992-07-28
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370112, 371 60, H04J 322
Patent
active
051346125
ABSTRACT:
A digital communication terminal equipment is coupled between one or a plurality of low-speed group transmission paths and one or a plurality of high-speed group transmission paths. The digital communication terminal equipment comprises a reference part and a supervised part coupled between selected low-speed group transmission paths and high-speed group transmission paths depending on states of first and second switches, and a bit comparison supervision part for detecting a bit error in a transmission signal which is transmitted between the low-speed group transmission path and the high-speed group transmission path. The reference part has a demultiplexer circuit which demultiplexes a high-speed group signal which is received from the high-speed group transmission path via the second switch into a low-speed group signal, a memory for storing the low-speed group signal from the demultiplexer circuit in response to a write clock signal which is multiplexed within the high-speed group signal, a phase locked loop circuit which includes a voltage controlled oscillator and controls a read out from the memory in response to a read clock signal which is derived by smoothing the write clock signal, and a state detector for detecting an unstable change in an input voltage of the voltage controlled oscillator and for outputting a control signal. The control signal has a level for disabling an operation of the bit comparison supervision part when the state detector detects the unstable change in the input voltage of the voltage controlled oscillator.
REFERENCES:
patent: 4993013 (1991-02-01), Shinada et al.
Fujitsu Limited
Safourek Benedict V.
Temesphen Ghebretinsae
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