H20-20No.7号信令系统介绍

An introduction of No.7 signal system in H 20-20

随着通信技术的发展和通信业务的不断增加 ,中国 1号信令系统在很多方面已不能满足用户的要求 ,特别是在采用数字中继进行组网时 ,H 2 0 - 2 0中国 7号信令系统 。

There are a lot of applications of H 20-20 series digital programs control switch in electric power system. With the development of communication technology and continue increasing of communication operation,China NO.1 signal system can't satisfied with user's request, particularly when we build communication networks adopting digital relay,H 20-20 series digital programs control switch will be applied abroadly.