| 摘要 |
The present invention relates to an ATM-PON system realizing an access network of FTTC/H(fiber-to-the-curb/home), more particularly, to an optical network unit function processing apparatus in ATM-PON system linked directly to a plurality of subscriber's lines. The present invention includes an optical distribution network(ODN) matching part carrying out a function of a physical layer required for connecting an optical network unit (ONU)to an optical distribution network; an ATM processing part exchanging an ATM(asynchronous transfer mode) cell with the optical distribution matching part, the ATM processing part carrying out functions of changing a header of an interactive ATM cell, routing, QoS(quality of service) buffering according to service connecting levels, processing real-time OAM(operation administration and maintenance), and UPC(user parameter control); an AAL1 processing part exchanging an ATM cell with the ATM processing part and executing AAL(ATM adaptation layer)1 processing functions such as segmentation of subscriber lines, reassembly, disposal and generation of a pointer, disposal and generation of an ATM cell, restoration of ARTS(synchronous residual time stamp) clock, and cell delay variation(CDV); and a processor connecting part controlling operational modes of the optical distribution network matching part, the ATM processing part, and the AAL1 processing part and reading operational states thereof, the processor connecting part inserting an OAM cell interactively and extracting the OAM cell outside, the processor connecting part reading and writing an external upward/downward connecting memory for establishment and cancellation of connection.
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