应该说,端到端的全光网络是宽带发展的最终方向.然而,我们也必须看到,FTTH(光纤到户)需要重新布线入户,要完全取代目前广泛应用的 ADSL仍然有待时日.为了最大限度地利用现有的ADSL接入,同时又能满足应用丰富后不断增长的带宽需要,ADSL2+等接入手段也受到运营商的重视. 据了解,固网宽带运营商近几年已经逐步停止普通ADSL建设,开始推行ADSL2+,在1公里的距离内上行速率可达20M左右,为目前的10至20倍.
互联网发源于美国,经过漫长的实验,到1995年才在商务运用方面有了突破性...
Hades' Land
Hades is the lord of the dead and ruler of the nether world, which is referred to as the domain of Hades or, by transference, as Hades alone.
2007-9-15
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