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Ｖ５接口是ＩＴＵ－Ｔ新近提出的一种用于ＡＮ（接入网）和ＬＥ（本地交换机）之间的标准化数字接口。在Ｖ５接口上能够支持多种协议的接入。本文着重讨论了Ｖ５接口上ＰＳＴＮ协议的实现过程。
The V5 interface is a newly proposed standardized digital interface between the AN (Access Network) and the LE (Local Switch) proposed by ITU-T. V5 interface can support multiple protocol access. This article focuses on the implementation of the PSTN protocol on the V5 interface.