The present paper describes telecommunication plants for tunnels, which can support multiple services in a wide frequency range of VHF and UHF bands.The illustrated systems have a structure employing such techniques as “grading” and signal optical transport, in order to reduce the number of line amplifiers per unit of tunnel length and the amplifier powers.
Multiservice Communications Plants for Long Tunnels
Sae Technical Papers
Vehicle Navigation & Instrument Systems ; 1991
1991-10-01
Conference paper
English
Multiservice communications plants for long tunnels
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