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1 我国长途网的现状我国当前的长途两级网仍沿用以前四级网固定分级的选路方式,呼叫在高平面网状网的任意一个路由上都不允许溢出。这样的规定主要基于两方面的考虑,一是对于任意一个方向的呼叫,网路都能提供固定的最终路由,避免了网路在异常情况下的不稳定;二是由于有了固
1 The status quo of China’s long-distance network China’s current long-distance two-level network still follows the previous fixed-level four-tier network routing, call any of the high plane mesh network routing are not allowed to overflow. Such provisions are mainly based on two considerations, one for any direction of the call, the network can provide a fixed final routing, to avoid network instability in abnormal circumstances; the second is due to the solid