In order to have as simple as possible equipment in international exchanges anc. to avoid Lmble seizures, System No. 4 has been designed in 1949-1954 for one-way operation of international circuits in semi-automatic and automatic working.
ITU-T Q.108-1989由国际电信联盟 IX-ITU 发布于 1989-01-01。
ITU-T Q.108-1989 在中国标准分类中归属于: M11 通信网技术体制。
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