What about T1/E1 Up to 18,000 feet 1.544 Mbps (T1) 16,000 feet 2.048 Mbps (E1) Regards, Sreeja S Pillai Engineer - Hardware SCM Microsystems ( India ) Pvt. Ltd. ***********************************************************************= ******* = =20 Yafei Bi = =20 <yafei_bi@xxxxxxx To: Georg.Ramsch@t= -online.de, wangyf@xxxxxxxxxxx =20 om> cc: si-list@freeli= sts.org =20 Sent by: Subject: [SI-LIST] Re: = long distance calbe data transferring =20 si-list-bounce@fr = =20 eelists.org = =20 = =20 = =20 09/09/2004 05:43 = =20 AM = =20 Please respond to = =20 yafei_bi = =20 = =20 = =20 Hi, VDSL spec at 13000ft =3D 4km. but by looking at the following: http://www.ikanos.com/solutions/pdfs/dmt_benefits_oct02.pdf page 12, the up/down stream throughput vs. distance, it seems it is achievable for your bit rate. regards, Yafei --- Georg Ramsch <Georg.Ramsch@xxxxxxxxxxx> wrote: > Hallo, Wang ! > > 1) Just a proposal: why do you not use standard DSL > chip sets available > in the market? > There is a miriad of those from Infineon, Connexant > etc. They offer a > lot of development support. > > 2) see 1) > > 3) Simulation: ETSI regulations ( DSL: ITU G.992 > G.991 and others ) > give information about 7 different telecom cable > types with > their impedance over frequency and also stray > parameters ( R',L,C'). > > 4) see 1) > > On a US web site there is also a noise calculator > for telecom cable > occupied with > POTS / ISDN / DSL technologies to estimate > noise level and therefore BER ( Lets see if I find > the link, it is > already some years ago ). > > My 2 cents > > Georg > > > wangyf@xxxxxxxxxxx wrote: > > >Hi, all > >I=A1=AFm 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 > > > > > > > > > > > > > ------------------------------------------------------------------ > 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 > > > __________________________________ Do you Yahoo!? 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Mail is new and improved - Check it out! http://promotions.yahoo.com/new_mail ------------------------------------------------------------------ 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 = ------------------------------------------------------------------ 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