Hi, all I’m dealing with a project of transferring digital data via 7 km copper twisted cable, the data rate is 510-kbit/s or higher, and BER needed is 1E-5 or lower. This must be a challenging task as the 0s and 1s are smeared after they traveled through such a long way. My questions are: 1. What kind of code is best suited for the transfer. 2. I need equalization, but are there any proper equalizer for this? 3. How can I develop model for 7km copper twisted cable? Is there any simulation tool for it? 4. One approach is using ADC to sampling the signal, and then use DSP to enhance it. Is it a good method? I want to have your helps, and thanks in advance. Yanfang Wang Fast Electronics Laboratory University of Science & Technology of China E-mail: wangyf@xxxxxxxxxxx Phone: +86-551-3603114 FAX: +86-551-3603114 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu