Multiplex communications – Wide area network – Packet switching
Patent
1989-06-09
1990-11-20
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3710082, H04J 116, G06F 1100
Patent
active
049724053
ABSTRACT:
A transmission system in which a plurality of data streams are to be multiplexed and sent between receiving and transmitting equipment. At the transmit end the system comprises a plurality of worker tributary cards (51, 52) each having an input port (57) connected to an individual tributary to be sent to an associated multiplexer, and a stand-by tributary card (56) operative to replace a failed worker card. All the worker tributary cards (51-55) are interconnected by a common line (60) leading to the iput port (57) of the stand-by tributary card (56) but in normal operation being isolated from said line by a controllable unity-gain buffer 58. Each tributary to be transmitted is connected to an input port (57) of a worker tributary card and has a branch line which is connected to said common line (60) via the buffer (58) carried on another tributary card, detection of failure of a worker tributary causing the buffer (58) of the associated worker tributary card to be enabled to connect the tributary to said stand-by tributary card.
REFERENCES:
patent: 4562575 (1985-12-01), Townsend
patent: 4570261 (1986-02-01), Maher
"A 1+1 Protected Digital Muldex for 3.times.45 Mb/s to 140 Mb/s Conversion", by J. Drupsteen, Philips Telecommunication Review, vol. 40, No. 3, Sep. 1982, pp. 183-192.
"TM 45/140 Interface Multiplexer for the European and American Standard Digital Hierarchies", by F. Ferret et al., in Commutation and Transmission, No. 3, 1985, pp. 29-34, & 36-38.
Edwards Christopher O.
GEC Plessey Telecommunications Limited
Olms Douglas W.
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