Multiplex communications – Wide area network – Packet switching
Patent
1987-12-09
1989-08-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082501, H04J 314, H04L 100
Patent
active
048539279
ABSTRACT:
The transmission restoration for faulty operating paths is generally constituted by a direct transmission restoration or a centrally controlled transmission rerouting. In the substitute direct transmission rerouting, N restoration links are permanently assigned to M operating paths, so that when faults affect more than N operating paths, M-N operating paths do not have the possibility to switch to the restoration link. With the centrally controlled transmission rerouting the employment of the restoration link requires reporting this fault to the supervising station as well as transmitting the control message from the supervising station to the switching matrices. The time required thereto generally causes all connections through the faulty operating path to be broken. By means of decentralized controlled transmission rerouting in which the rerouting control devices positioned after the location of the fault in the direction of transmission take over the master function for the transmission direction involved, one restoration link is always determined, in a simple manner and independent of each other, which need not perforce be led along the same route or in the same transmission system. Hence, a restoration link in the relevant direction of transmission can be determined and switched to immediately without the monitoring devices which detect the fault in the message transmission system having to communicate with each other.
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patent: 4375681 (1983-03-01), Abbott et al.
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patent: 4680750 (1987-07-01), Davidow
patent: 4700340 (1987-10-01), Beranek
Schickner et al., "Requirement for & Design of an Automatically Switched 140 Mbit/s Digital Service Protection", British Telecommunications plc and The Plessy Company, plc, IEE Telecoms Conf., 1988, pp. 74-77.
"Plessy ASDSPN System", A leaflet from the Plessy Company dated 1986.
P. J. Sutton, "Service Protection Network", published by British Telecom plc in 1986.
Nlf Hedman et al., "Automatic Protection Switching of Transmission Links", Ericson Review, No. 1, 1979, pp. 40-48.
Barschall Anne E.
Briody Thomas A.
Haken Jack E.
Olms Douglas W.
U.S. Philips Corporation
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