The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2001
Filed:
Dec. 11, 1998
NEC Corporation, Tokyo, JP;
Abstract
In an ATM cell transmission system having an ATM layer device (,), a data path interface (,) and a plurality of normal PHY (Physical) layer devices (,-,to,-M) according to Utopia Level 2 specification, the ATM layer device (,) comprises: a cell buffer (,); FIFO memories (,-,to,-M) each corresponding to each of the normal PHY layer devices (,-,to,-M); an output controller (,′) for controlling the cell buffer (,) to output an ATM cell to be transmitted through one of the normal PHY layer devices (,-,to,-M) into corresponding one of the FIFO memories (,-,to,-M) on condition that the ATM cell is stored in the cell buffer (,) and the corresponding one of the FIFO memories (,-,to,-M) is not full; and a cell transmission controller (,) for performing polling of the normal PHY layer devices (,-,to,-M), designating a selected PHY layer device among the normal PHY layer devices (,-,to,-M) which have returned the HIGH level of the cell transmission allowance signal (TxClav) to the polling and whereof corresponding FIFO memories (,-,to,-M) are not empty, selecting one of the FIFO memories (,-,to,-M) corresponding to the selected PHY layer device as a next sender of cell data to be transmitted through the data path interface (,), and designating the selected PHY layer device at an end of the current transmission cycle as a next receiver of the cell data.