H - Electricity
04
B
H04B 5/02 (2006.01) G06F 1/16 (2006.01) G06F 13/38 (2006.01) G06F 13/40 (2006.01) H01Q 1/00 (2006.01) H01Q 1/22 (2006.01) H04Q 1/14 (2006.01) H05K 1/14 (2006.01)
Patent
CA 2273312
In order to avoid mechanical assembly problems and transmission of undersired electrical currents among circuit cards or boards in a telecommunications swich or similar digital device, a conventional hard-wired midplane bus is replaced by a wireless bus. The wireless bus includes a radio frequency or light wave transceiver on each card. Antennas on respective cards can either be oriented within direct line-of-sight of each other, or can project into a waveguide which directs the transmitted signals past all the other antennas. For example, the waveguide may be a metal enclosure which surrounds all the cards. Alternatively, respective aligned apertures in the cards can define a continuous transmission path. A data rate exceeding 1 megabit per second and a transmission power on the order of 1 milliWatt are preferred, since the bus is intended for use within a single switch housing. Radio frequencies in the middle to high microwave range of light frequencies in the visible range are preferred, to provide sufficient bandwidth and to facillitate servicing.
Alcatel
Robic
LandOfFree
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