Multiplex communications – Wide area network – Packet switching
Patent
1992-03-13
1994-08-30
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 55, 371 82, 375 38, 34082501, H04L 122
Patent
active
053434641
ABSTRACT:
A switching system includes a protection switch that operates to switch a working transmission line to a protection transmission line or switch an optional transmission line to the protection transmission line. The protection switch consists of a first speed converting unit, a second speed converting unit and an add-drop unit that handles a lower order signal and is sandwiched therebetween. The optional transmission line for carrying a lower order signal is connected, via the add-drop unit and the second converting unit, to the protection transmission line carrying a higher order signal during an add-drop operation. Alternatively, the working transmission line carrying a higher order signal is connected, via the add-drop unit and the first and second converting units, to the protection transmission line under a through operation mode. The protection switch is preferably realized by using an add-drop multiplexer (ADM).
REFERENCES:
patent: 4984252 (1991-01-01), Morimoto
patent: 5010550 (1991-04-01), Hirata
patent: 5014261 (1991-05-01), Shinbashi et al.
patent: 5105420 (1992-04-01), Ardon et al.
patent: 5109296 (1992-04-01), Fukushima et al.
Fukushima Takeo
Iino Hatsumi
Fujitsu Limited
Safourek Benedict V.
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