Original Network Status:
There are there sites A, B and C in a Ring Topo structure and dual fiber between each other. And the transmission distance between each other is about 40KM.
Customer Networking Requirement:
The customer would like to transmit 2 different Bidi services from the local site A to site B and Site C, and need ring backup protection in service transmission.
Solution Explanation:
CH1 and CH2 are service of OC3; CH3 and CH4 are service of OC12; and the wavelengths of each channel CH1/CH2/CH3/CH4 are 1510nm/1550nm/1530nm/1570nm. 1510nm and 1550 nm are the same direction; and 1530nm and 1570 nm are the opposite direction. When there is some problem with 1510nm or 1550nm, or problem of the fiber broken, the protection backup system will switch to the other direction to continue to transmit signals.
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