[SI-LIST] Re: long distance calbe data transferring
- From: Yafei Bi <yafei_bi@xxxxxxxxx>
- To: Georg.Ramsch@xxxxxxxxxxx, wangyf@xxxxxxxxxxx
- Date: Wed, 8 Sep 2004 17:13:46 -0700 (PDT)
Hi,
VDSL spec at 13000ft = 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¡¯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
> >
>
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