本技术报告（TR）介绍了用于评估基于IP的电信网络接入可用性的概念。计算基于网络中IP路由器的访问可用性。TR提供了根据客户、端口和带宽对可用性计算进行加权的替代方法。本技术报告是关于基于IP的网络可靠性指标的一系列技术报告中的第一份。下一份报告将包括主干网，从而允许进行完整的网络可用性评估。

This Technical Report (TR) introduces the concepts for use in assessing the availability of access to IP-based telecommunications network. The calculation is based on the access availability of IP routers in the network. The TR presents alternate methods for weighting the availability calculation in terms of customers, ports, and bandwidth. This Technical Report is intended as the first in a series of Technical Reports, on the reliability metrics for IP-based networks. The next report will include Backbone networks thereby permitting a complete network availability assessment.