A device for converting utopia level 2 to utopia level 1 in asynchronous transmission mode communication.

摘要

The present invention relates to an apparatus for converting a utopia level 2 interface into a utopia level 1 interface.;This invention includes a delay 820 for delaying a predetermined clock delay of data input from a utopia Level 2 interface device; A VPI latch 830 for latching a virtual path identifier (VPI) included in an ATM cell header in word units among data inputted in a delay; Port address generating means for storing port address data corresponding to the VPI in advance and providing a port address corresponding to the VPI input from the VPI latch; A demultiplexer 850 for distributing data stored in the delay in accordance with a port address input from a port address generating means; Word FIFOs 860a to 860d for storing cell data in word units received from the demultiplexer; Word-byte converters 870a to 870d which receive the output of the word FIFO and convert it into cells in bytes; Byte FIFOs 880a to 880d for storing byte cell data input from a word-byte converter; Utopian level 1 interface controller 890; And a utopia level 2 interface controller 810.;Therefore, in the present invention, when the physical layer is Utopia level 2 and the ATM layer is Utopia level 1, or the physical layer is Utopia level 1 and the ATM layer is Utopia level 2, level 2 and level 1 devices are easily converted by converting level 2 to level 1. Can match.