[SI-LIST] Re: long distance calbe data transferring
- From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 8 Sep 2004 11:36:29 -0700
Not knowing much about those DSL chips, but having experience
with not being able to get DSL service at home because of the
distance limitations of about 18000 feet 3.4 miles (about 5.5 km)
I wonder whether Wang will be able to use these chips for a 7 km
design...
Arpad Muranyi
Intel Corporation
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Georg Ramsch
Sent: Wednesday, September 08, 2004 11:10 AM
To: wangyf@xxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: long distance calbe data transferring
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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