羞羞网站免费在线观看_羞羞网站在线_黄片APP下载羞羞视频_羞羞视频网站免费观看 在线视频夫妻内射,在线观看成本人亚洲,日韩a

VDSL (very-high-speed digital subscriber line) technology is similar to the well-known ADSL, and facilitates the delivery of information at speeds of up to 52 Mb/s. Standard VDSL deployment uses a frequency spectrum up to 12 MHz, whereas VDSL2 allows for up to 30 MHz as an option.