Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Patent
1996-04-03
2000-07-11
Vu, Huy D.
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
370539, H04J 302
Patent
active
060883715
ABSTRACT:
An up-grading method for a transmission apparatus including at least one low-speed side interface device, at least one high-speed side interface device, and a cross connection or add/drop MUX device which has at least one of a function of multiplexing a signal from the low-speed side interface device to connect the multiplexed signal to the high-speed side interface device, a function of distributing a signal from the high-speed side interface device to the low-speed side interface device, and a function of establishing physical and logical signal paths between any low-speed side and any high-speed side interface devices. When the transmission speed of the high-speed side interface device is to be increased, a high-speed transmission apparatus having thereon an interface device having a higher interface speed, a cross connection or add/drop MUX device, a clock signal distributing device and a control device is newly connected to the cross connection or add/drop MUX device of the existing transmission apparatus, the high-speed side interface device of the existing transmission apparatus is replaced by a low-speed side interface device, the cross connection or add/drop MUX device of the existing transmission apparatus is interconnected to the newly added high-speed transmission apparatus, and the existing transmission apparatus is used as an exclusive apparatus for accommodation of low-speed side interfaces.
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Inada Manabu
Itoh Noriko
Sugioka Tetsuya
Hitachi , Ltd.
Vu Huy D.
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