+ The main transmission line, directly connected by optical fiber, optical cable network using existing optical cables and lines are currently in the deployment plan of the electric power industry.+ Redundant transmission line, connecting through the channels of the existing SDH-network services of the electrical industry. Additional optical device fitted the top end at the knot to make sure set 1 SDH network ring circuit (a minimum of 2 direction connection for 1 point substation button not the users).
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