论文部分内容阅读
这几年来,高速互联网接入市场的竞争愈演愈烈,不但接入的速度越来越高,接入的价格也大幅下降了。在英国,大部分ADSL线路都是由BT(英国电信)提供的。接入速度一般是下行1024kbit/s,上行256kbit/s,如果用户的线路质量较好,而且距离交换机较近,可以实现下行速率2048kbit/s,上行速?
In recent years, the competition in the high-speed Internet access market has intensified, not only increasing the access speed but also decreasing the access prices. In the UK, most of the ADSL lines are provided by BT (British Telecom). Generally, the access speed is 1024 kbit / s downstream and 256 kbit / s upstream. If the user’s line quality is good and the distance to the switch is short, the downlink speed can reach 2048 kbit / s and the uplink speed?