ITU-T L.11-1988
Joint Use of Tunnels by Pipelines and Telecommunication Cables@ and the Standardization of Underground Duct Plans

Standard No.

ITU-T L.11-1988

Release Date

1988

Published By

ITU-T - International Telecommunication Union/ITU Telcommunication Sector

Latest

ITU-T L.11-1988

Scope

General considerations Duct tunnels and trenches are constructions containing one or generally more ducts belonging to different networks. Tunnels which can be inspected (inspectable tunnels) include one or more gangways for initial assembly work and for subsequent control@ maintenance and repair operations. A tunnel without standing room@ but designed for crawling should have a clear internal height of at least 0.8 m. Duct gangways may not be entered. The above principles apply to inspectable tunnels@ and apply by analogy to tunnels with crawling room only. Tunnels may contain ducts belonging to the following types of networks: - collective antennas; - telecommunications; - electricity; - gas; - water; - district heating; - ducted transport (e.g. pneumatic tubes); - drainage water.

ITU-T L.11-1988 history

• 1988 ITU-T L.11-1988 Joint Use of Tunnels by Pipelines and Telecommunication Cables@ and the Standardization of Underground Duct Plans