but for ESC (Electric Supervisory Channel)
1- features : Converge supervisory signal in main signal.
2- advantages : Reduce complexity, cost-effective. (Need not OSC board)
Improve system power budget (Throw off Insertion loss of FIU)
3- disadvantages : OLA site does not support ESC.
The ESC reduces the investment of the OSC. It also deletes the insertion loss of the FIU. This lowers the cost and the power budget of optical channels.
The following restrictions on using ESC:
1- No services are added to or dropped from the OLA site. The ESC function cannot be provided by the OTU. Use the DCN network to provide management.
2- When the ESC is used, order wire cannot be provided. At present, order wire interfaces are on the OSC board.