The same problem also affects fixed-line telecoms networks, as broadband infrastructure is upgraded from copper wires to optical fibres and new equipment is installed to handle larger volumes of data.
随着宽带网络基础设施从铜线升级到光缆，和处理为处理大批量数据使用新设备，同样的问题也困扰着有线电信网络。
The Jubilee line, one of the more recent additions on the network, has been upgraded to suit its role as the main tube route to Stratford.
银禧线是地铁网络中最新增加的线路之一，经过改善已成为通往斯特拉特福德的主要地铁线。
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