Multiplex communications – Wide area network – Packet switching
Patent
1989-07-17
1991-10-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 370 681, 370 80, 3701101, 370112, 371 201, 34082536, H04J 314
Patent
active
050581040
ABSTRACT:
In a channel bank at one of TDM hierarchical levels, a TDM demultiplexer includes a plurality of high-speed interfaces connected respectively to high-speed digital transmission lines. Each interface receives detects a line fault and appends an alarm signal of a time-slot duration to time slots of digital signals. The outputs of the high-speed interfaces are multiplexed into a TDM frame sequence and the time slots of data signals in that TDM frame sequence are interchanged according to a prescribed rule. The slot-interchange frame sequence is demultiplexed into plurality of TDM signals greater in number than the number of the high-speed interfaces. Low-speed interfaces respectively receive the demultiplexed TDM signals to detect the time slot in which the alarm signal is contained and transmits a line fault signals to a respective one of low-speed transmission lines.
REFERENCES:
patent: 4347600 (1982-08-01), Abbott et al.
patent: 4567587 (1986-01-01), McDermott
patent: 4815074 (1989-03-01), Jacobsen
patent: 4858224 (1989-08-01), Nakano et al.
Yokose Yoshio
Yonehara Akifumi
Hsu Alpus H.
NEC Corporation
Olms Douglas W.
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