RE: lug-bg: dvuzichna linia
- Subject: RE: lug-bg: dvuzichna linia
- From: bkrosnov@xxxxxxxx (Boyan Krosnov)
- Date: Wed, 10 Jan 2001 10:34:04 +0200
w interes na istinata ako si seriozen hardware-ist i imash podhodqshtite
chasti i kachestweni kabeli NA KYSI RAZSTOQNIQ po 3 jici (edna za zemq)
moje da uspeesh...
w 10BaseT signalite se predawat diferencialno (ili
balansirano,simetrichno sprqmo zemq).
t.e. za wsqka posoka imash 2 provodnika kato po ediniq se predawa
signala a po drugiq signala invertiran sprqmo zemqta.
W EDIN MOMENT ako na ediniq prowodnik ima naprejenie A na drugiq ima
naprejenie -A.
ideqta mi e wzimash samo polojitelniq provodnik i gi prekarwash prez
ednata jica. ot drugata strana stoi edin operacionen usilwatel kojto ti
regenerira otricatelniq sprqmo zemq. po syshtiq nachin w obratnata
posoka.
za da raboti towa trqbwa dosta neshta da se syobrazqt, izchislqt.....
chestotnata lenta na operacionniq usilwatel trqbwa da e dostatychno
golqma
trqbwa da se proweri dali linkpulses(ili beacon-ite) sa na syshtiq
diferencialen princip.
trqbwa da se syobrazqt vhodniq i izhodniq impedans na usilwatelite.
da se preceni ne moje li za treta jica da se polzwa zazemqwaneto na
sgradata.
da se wnimawa sys razstoqniqta m/u dwete tochki, kabeliraneto tam,
shtoto ne predawame signala diferencialno i shte ima STRASHNI zatihwaniq
i shumowe.
ne che e lesno da se naprawi ama wse pak e nqkakwa wyzmojnost ako
tolkowa ne iskash da puskash kabel :)
regards,
--
Boyan Krosnov (http://www.nat.bg/~bkrosnov)
Network Administrator
Lirex BG Ltd.
> -----Original Message-----
> From: Dancho Mitev [mailto:dancho_mitev@xxxxxxxxxxx]
> Sent: Wednesday, January 10, 2001 8:09 AM
> To: lug-bg@xxxxxxxxxxxxxxxxxx
> Subject: Re: lug-bg: dvuzichna linia
>
>
>
>
>
> >From: Rosen <roska@xxxxxxxxxxxx>
> >Reply-To: lug-bg@xxxxxxxxxxxxxxxxxx
> >To: lug-bg@xxxxxxxxxxxxxxxxxx
> >Subject: lug-bg: dvuzichna linia
> >Date: Tue, 09 Jan 2001 20:14:20 +0200
> >
> >Nyakoi moze li da mi kaze dali po obiknovena
> >2-provodnikova telefonna liniq mezdu dve
> >sasedni pomestenia (10m) moga da naprawq
> >Ethernet vrazka m/u 2 PC-ta? Ne mi se iska
> >da slagam modemi ot dvete strani - tryabva
> >da gi kupuvam, a i vrazkata ste bade bavna.
> >Ot druga strana, v ednoto pomestenie ima izgradena
> >10Mb Ethernet mreza s UTP kabeli, i kupuvaneto na
>
> Ne movesh da pusnesh Ethernet po dwuprowodna liniq.
> Eto ti edin link kojto shte ti pomogne po wyprosa s okabelqwaneto.
> http://www.techfest.com/networking/lan/ethernet.htm
>
>
> ______________________________________________________________
> ___________
> Get Your Private, Free E-mail from MSN Hotmail at
http://www.hotmail.com.
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==================================================================
A mail-list of Linux Users Group - Bulgaria (bulgarian linuxers)
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http://www.linux-bulgaria.org/ Hosted by Internet Group Ltd. - Stara Zagora
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