DOCSIS 3.0 Cable Modem IP Verification

Abstract

Thesis discusses about functionality check of DOCSIS 3 standard Cable Modem IP. Packets transfer from CMTS model (Distribution Hub) to Cable Modem is called Downstream path transmission. Packets transfer from Cable Modem to CMTS model is called Upstream path transmission. This thesis discusses development of Test con- guration to check Upstream path modules, Downstream path modules functionality. Have covered features in the test cases are Data suppression, Concatenation of the frame, Fragmentation of the frame, Data Encryption, High Priority and Low Priority for speci c tra c, Ether type version IPv4 and IPv6 used in one test case etc. All above features are covered to check functionality of IP modules. Grey box functional veri cation approach is used to verify RTL of Cable Modem IP. Register programming for the above mentioned features are linked with RTL by software using Type-1 ST communication bus (32 bit Data width). Packets are transferred from DDR memory to RTL by software using Type-3 ST communication bus (128 bit Data width). Thesis discusses about error debugging work (1) Software check:- File generated by the soft- ware must be according to the test con guration. (2) RTL check:- Checking response of each IP module on waveform. Main purpose is to check functionality of each IP module (3) CMTS reference model check:- For successful veri cation le generated by the software and le generated by the CMTS reference model must be matched. Thesis discusses development of check script for Upstream path which compares le generated by the Upstream software and le generated by the CMTS reference model. Upstream test cases are passed for which No of packets, Destination Address, Source Address, Ether type version, Service Flow, Packet size, Each byte of the packet match correctly in both the le. Check script for Downstream path compares le generated by the CMTS reference model and le generated by the Downstream software when packets are received at DDR memory. Downstream test cases are passed if No of packets, Downstream Service ID, Each byte of the packet, Destination Address and Source Address are matched in both the les.