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| PRELIMINARY TALKING ABOUT STRUCTURAL CHARACTERISTIC OF COMMUNICATION SYSTEM FOR SHIMEN-CHANGSHA RAILWAY |
| NE Tong- jin |
| Fourth Survey and Design Institute of MOR |
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Abstract Combined with the communication engineering works for the Shimen-Changsha Railway，the paper introduces the structural mode of SDH-155 synchronous transmission system used in the Shi-Chang Railway and its design characteristics. The circular circuit transmission network constructed according a ring mode has been adopted， and a dispatching real~loop exchange-function installation has been established in order to guarantee the continuity of the dispatching telecommunication.
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Received: 20 January 2000
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2000, Vol. 17 
