Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1997-09-25
2001-06-12
Nguyen, Chau (Department: 2663)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S474000
Reexamination Certificate
active
06246685
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cell assembling device and, more particularly, to the arbitration of the order of cell transmission to be effected when, e.g., a plurality of channels of speeches or data are sent in the form of ATM (Asynchronous Transfer Mode) cells.
2. Description of the Background Art
ATM communication apparatuses and ATM switches have recently been proposed in various forms. An ATM communication apparatus, for example, is constructed to receive a speech signal and transform it to cells having a fixed length, or to transform communication data input from a terminal unit to cells. The ATM communication apparatus may be constructed to receive a plurality of parallel speech signals or data alone and multiplex them into ATM cells. It has been customary with the apparatus of the type receiving parallel speech signals or data to fix the order of ATM cell transmission, to send assembled ATM cells in a preselected order.
When a plurality of channels of speech signals or data are sent in the form of channel-by-channel ATM cells, it is necessary to set up an optimal transmission order in conformity to the transmission rates of the individual speech signals (e.g., 64 kbps (kilobits per second), 32 kbps or 16 kbps) or the data. Further, every time the bit rate or the data rate is changed, the optimal transmission order must be changed.
Moreover, when the configuration is noticeably different from one channel to another channel, it is likely that the required capacity of an ATM cell assemblage buffer increases or that the buffer overflows and causes data to be discarded, depending on the transmission order.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a cell assembling device capable of forming, when a plurality of channels of signals are input in parallel, cells efficiently with a simple construction even if the signals each has a particular channel configuration, frequency band or rate.
A cell assembling device of the present invention includes a n input circuit for receiving a plurality of channels of input signals in parallel and decomposing each input signal into unit data necessary for forming a cell. A storage temporarily stores the unit data decomposed channel by channel and outputs one unit data designated by a read command. A cell forming circuit adds cell header information to the unit data output from the storage to thereby form a cell. An arbitrating circuit monitors a condition in which the unit data are stored in the storage channel by channel, and generates the read command matching with the condition and feeds it to the storage.
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patent: 5160923 (1992-11-01), Sugawara et al.
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Shimizu Kyouta
Tazoi Yasuhiro
Toya Kenichi
Frank Robert J.
Nguyen Chau
OKI Electric Industry Co., Ltd.
Sartori Michael A.
Trinh D.
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