ADSL connection

[Βασιλειου Σπυρος]

> 
> > Ethernet fisika. USB modem simbata me linux den yparxoun kai pola ston
> > planith akoma. Kai malon den einai ena apo afta to jetstream sou. Alla
> > se ethernet sindesh doulebei xalara.
> To Alcatel Speedtouch USB Adsl Modem mou douleuei syrma me to kernel 
> module tou 2.4.22+ kai me HDLC line discipline support.
> 
Sigoura alla to JetSpeed 500i einai mini-router kai me to neo firmware
pou fortosa exeis polles dynatothes.. (Mallon se ethernet kleino ...)

> > Na simiosw edw kati. H DSL den exei egkihmenh taxitita apo esena mexri
> > ton provider sou. Opote endexete sixna pikna na deis thn telikh taxitita
> > sou na peftei sto miso h kai parapano. Sini8os gia ayto ofilete o OTE
> > dixos na apoklionte bebeos kai problimata stous diaforous providers.
> > Aplos mhn deis kamia mera na katebazeis me mish taxitita kai amesos
> > katigoriseis to diktio tou provider pou sto telos 8a epilejeis. Skepsou
> > kai ton OTE prota 8-)
> Tha symfwnisw me ton gnome-p.christea :) H adsl apo esena mexri ton 
> provider yposthrizei mexri 8mbit downstream. O router tou provider kanei 
> traffic shaping, kai sou moirazei osa kbit sou antistoixoun. Otan 
> anaferoun contention ratio 20:1, shmenei oti mia dedomenh stigmh, mporeis 
> na vriskesai sto idio 384kbit class me allous 19 adsl subscribers. Vevaia 
> afto prosexoun na mh symvainei, pera apo periptwseis opou yparxei megalo 
> traffic load ston ISP. Se genikes grammes, otidhpote ptwseis apodoshs 
> parathreis einai synithws logw contention ratio.
> 

Otan kanete thn aithsh gia ADSL line ston OTE sas dinoun na ypograpsete kapoious
orous. Tous exete diabasei?

Leei: 1) O OTE den eggyatai statheri taxythta grammhs apo to topiko kentro eos
ton katanaloth kai h taxythta ayth eksartatai apo thn apostash metaksi katanaloth
kai kentrou kai epishs apo thn poiothta (ennooun ilikia) ton xalkinon diadromon.
Me apla logia an h apostash sou apo to kentro sou einai 1000m alla me nea kalodia
tha piaseis poli kaliteri taxythta apo kapoion me idia apostasi alla palia kalodia.
Allos paragontas einai posses fysikes syndeseis (kalodion) ginontai apo to spiti sou
eos to kentro.

Ola ta parapano dikaiologountai kai apo thn klasikh fysikh kymatikhs

2) Se allo shmeio leei oti me thn parousa ylopoihsh toy diktoy ADSL den ferei oudemia
eythini gia kathisterisi dedomenon, dyskolia metaforas kai adynamia syndesis me ton 
kathe ISP (den ksero bebaia an bgazei apekso thn OTENET - giannis pinei giannis kernaei)

Me apla logia, ayth thn stigmh yparxoyn mono 2 shmeia enoshs toy diktyou ATM-ADSL me to
backbone ths xoras oson afora ta diktya ayta. To ena ATHINA kai to allo THES/NIKH me taxythtes
mono 34Mbps ekasto. Mexri stigmhs einai energes mono 6000 syndromes ADSL se olous tous ISP
(anaferomai se dhmosieyma ths efhmeridas ISOTIMIAS stis 9-11-2003) kai apo aytes to 80% einai 
se taxythta 384/128. Ara mexri stigmhs kala kratei to traffic. Ama aneboun oi syndromes ti ginetai?

Ta parapano ta anafero dioti proton h arxikh erothsh htan gia kapoia config pou sas
zhto na mou peite opoios exei dokimasei bebaia, apo thn allh isos endiaferon na syzhthsoume
genikotera oloi mas edo mesa pos mporei na epidrasei to logismiko tou linux pano sthn 
nea anaptysomenh agora. Elpizo kapoioi na skeftontai opos skeftomai kai ego, apo thn 
allh einai oraio na anaptysoume antitheseis gia na kalyptoume ola ta endexomena.

Eyxaristo
Vasiliou Spiros


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