Patent ID: 6831919
Filing Date: 2004-12-14
Classification: H04L

Abstract:
A system for extending the capacity to accommodate low-speed subscribers in an asynchronous transfer mode (ATM) switching system, comprising:a subscriber board for interfacing with a switch link via a system backboard, for receiving a cell transmitted from the switch link, and for multiplexing/demultiplexing the received cell via a UTOPIA interface after performing an ATM layer operation; a physical layer board for exchanging data with the lower-speed subscriber and for serializing the cell transmitted from the subscriber board into a clock and data bits prior to the transmission to the low-speed subscriber; a multiplexing/demultiplexing board for recovering the clock and data bits received from the physical layer board via a cable, for converting the received clock and data bits to parallel data in a word unit, and for multiplexing the read cells, and for transmitting the multiplexed cells to the physical layer board via a link processor; and a plurality of extension boards for exchanging the cell with the multiplexing/demultiplexing board via a low-speed bus, for performing physical layer operation on the cell received thereon, and for transmitting the received cell to the corresponding low-speed subscriber via the physical layer board.