The CCITT, considering that many countries are interested in the joint use of tunnels and are aware of the advantages, disadvantages and specific dangers they hold; that the rules governing this type of ducting vary significantly from country to country; that the importance of the joint use of tunnels increases with increasing density of population and shrinking open spaces, i.e. in large towns.
ITU-T L.11 FRENCH-1988由国际电信联盟 IX-ITU 发布于 1988。
ITU-T L.11 FRENCH-1988 在中国标准分类中归属于: M30 通信设备综合。
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