In power line SS communication system, since available frequency range is limited from 10 kHz to 450 kHz by the law, we can't transmit any components of lower and higher frequency regions. In this paper, we propose a method for improving bit error rate by using the PN sequence coded by the new channel code, FM-V5 code, instead of PE code to have correlation property in the coded PN sequence. Correlation property in the coded PN sequence makes us effectively use Viterbi decoding technique on the receiving side. To enhance correlation property more, we also examine to apply additionally partial response (PR) system, so called PRML system, on the receiving side. The results of computer simulation show the improvement of about 4.5 dB on SNR at bit error rate 10-5 by using FM-V5 code without PR system compared with PE code. In the case of FM-V5 code with PR(1, -1) system, we get the further improvement of about 11 dB on SNR at the same bit error rate 10-5 compared with PE code. As a result, our method can attain SNR improvement about 20 dB compared with conventional simple PN sequence, that is the conventional Direct Sequence/Spread Spectrum (DS/SS), method.

Private networks are becoming globalized and more complicated through LAN-WAN interconnection. While WANs are managed by CMIP, LANs are managed by SNMP. To achieve end-to-end management, the integration of CMIP-based and SNMP-based management is important. We have developed an MI (Management Integration) platform for CMIP-based and SNMP-based management. It provides OSI SMF (Systems Management Function)-based unified basic management services to upper level applications regardless of the differences between CMIP-based and SNMP-based management. It achieves this with two modules: a management information transfer integration module that mainly covers protocol and data format differences between them, and a basic management module that covers functional differences. The translation of management information in the former module can be changed flexibly because the translation is based on an external script file. The latter module has additional SMF-like functions for the management of SNMP agents in addition to SMF manager role functions, etc. Prototype evaluation has demonstrated the feasibility of the MI platform.