PPCW VDSL 技術一問

ADSL VDSL 的電話線其實係唔係都係一樣?
只係VDSL 要係機房加部機 ADSL直去機房?
即係ppcw 要upgrade 30M只需要upgrade 佢d 古董就可以
咁講法正唔正確

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本帖最後由 raymondchan338 於 2010-1-22 22:49 編輯
想行VDSL, 條線一定要夠短(within 300m~500m), 所以舊調制器一定係裝你屋企附近, 之後再行光纖走.
平時D AD ...
7G 發表於 2010-1-22 16:14


VDSL2 deteriorates quickly from a theoretical maximum of 250 Mbit/s at 'source' to 100 Mbit/s at 0.5 km (1640 ft) and 50 Mbit/s at 1 km (3280 ft), but degrades at a much slower rate from there, and still outperforms VDSL. Starting from 1.6 km (1 mile) its performance is equal to ADSL2+.

ADSL-like long reach performance is one of the key advantages of VDSL2. LR-VDSL2 enabled systems are capable of supporting speeds of around 1-4 Mbit/s (downstream) over distances of 4 to 5 km (2 ½ to 3 miles), gradually increasing the bit rate up to symmetric 100 Mbit/s as loop-length shortens. This means that VDSL2-based systems, unlike VDSL1 systems, are not limited to short local loops or MTU/MDUs only, but can also be used for medium range applications.

http://en.wikipedia.org/wiki/VDSL2

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