可用性测量必须尽可能地靠近客户的终端系统，如果在网络服务供应商的出现点上跟踪可用性，电路最后一英里的失效可能检测不出来。

可用性测量必须尽可能地靠近客户的终端系统，如果在网络服务供应商的出现点上跟踪可用性，电路最后一英里的失效可能检测不出来。的英文翻译

基本释义

• Availability must be measured as close as possible to the customer's end system.If availability is tracked in the network service provider's point of presence,failures in the last mile of the circuit will go undetected.