FreeLists / si-list / [SI-LIST] Re: long distance calbe data transferring

[Georg.Ramsch@xxxxxxxxxxx (Georg Ramsch)]

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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