Multiplex communications – Wide area network – Packet switching
Patent
1991-10-30
1993-12-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701001, 3701055, 34082501, 371 82, 371 112, H04J 314, G06F 1116
Patent
active
052710017
ABSTRACT:
A plurality of working synchronous terminal stations and one standby synchronous terminal station are housed separately and have different synchronous pulse sources. Each working synchronous terminal station receives and multiplexes STM-N signals using its own particular synchronous pulse source and output a resultant transmission signal on its transmission path. The standby synchronous terminal station receives STM-N signals from a failing working synchronous terminal station and reformats the signals into new frames suitable for the standby synchronous terminal station. The standby synchronous terminal station further locates in the signals pointer information indicating the position in a frame where a data portion begins, and modifies the pointer information according to the new frames. The reformatted signals with modified pointer information are multiplexed within the standby synchronous terminal station and transmitted on a standby transmission path.
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patent: 4601028 (1986-07-01), Huffnan et al.
patent: 4700348 (1987-10-01), Ise et al.
patent: 4964112 (1990-10-01), Appelmann
patent: 5014261 (1991-05-01), Shinbashi et al.
patent: 5051979 (1991-09-01), Chaudhuri et al.
patent: 5146453 (1992-09-01), Hagler et al.
Hsu Alpus H.
NEC Corporation
Olms Douglas W.
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