adsl2

[britanie]

Ahoj mám doma zbytečný router Belkin ADSL with High- Speed Mode Wireless G Router 125 high speed mode, 2,4 GHz. Kamarád si teď udělal připojení přes pevnou linku a říká, že mu tenhle router bude na nic. Protože potřebuje označení ADSL 2- jinak mu to pojede pol. rychlostí. Tak jak to je a co to adsl2 znamená?

[Reklama]

[X]

http://cs.wikipedia.org/wiki/Asymetric_ ... riber_Line

[britanie]

hmmm tam žádné vysvětlení o ADSL 2 nevidím

[X]

http://cs.wikipedia.org/wiki/Asymetric_Digital_Subscriber_Line

Standardy ADSL
Název standardu Běžný název Downstream rychlost Upstream rychlost
ANSI T1.413-1998 Issue 2 ADSL 8 Mbit/s 1 Mbit/s
ITU G.992.1 ADSL (G.DMT) 8 Mbit/s 1 Mbit/s
ITU G.992.1 Annex A ADSL over POTS 8 Mbit/s 1 MBit/s
ITU G.992.1 Annex B ADSL over ISDN 8 Mbit/s 1 MBit/s
ITU G.992.2 ADSL Lite (G.Lite) 1,5 Mbit/s 0,5 Mbit/s

ITU G.992.3/4 ADSL2 12 Mbit/s 1 Mbit/s
ITU G.992.3/4 Annex J ADSL2 12 Mbit/s 3,5 Mbit/s
ITU G.992.3/4 Annex L[1] RE-ADSL2 5 Mbit/s 0,8 Mbit/s

ITU G.992.5 ADSL2+ 24 Mbit/s 1 Mbit/s
ITU G.992.5 Annex L[1] RE-ADSL2+ 24 Mbit/s 1 Mbit/s
ITU G.992.5 Annex M ADSL2+ 28 Mbit/s 3,5 Mbit/s



Externí odkazy
ADSL guide
Po drátech a ještě rychleji - ADSL: http://mobil.idnes.cz/…
ADSL na konci světa: dosáhnete na 16 Mbit/s? http://www.lupa.cz/clanky/adsl-na-konci ... oli-hraje/

[editovat] Reference
↑ a b ADSL2 Annex L is also known as RE-ADSL2, where 'RE' stands for 'Reach Extended.' With this ADSL standard, the power of the lower frequencies used for transmitting data is boosted up to increase the reach of this signal up to 7 kilometers (23,000 ft). The upper frequency limit for RE-ADSL2 is reduced to 552 kHz to keep the total power roughly the same as annex A. Since RE-ADSL2 is intended for use on long loops there isn't much (any) usable bandwidth above 552 kHz anyway. Although this standard has been ratified by the ITU, not all local loop network maintainers allow this protocol to be used on their network, simply because the extra power on the lower frequencies might cause problems for existing services due to crosstalk.
Citováno z „http://cs.wikipedia.org/wiki/Asymetric_Digital_Subscriber_Line“