Very cost effective way to provide optical line protection, intra-board & client 1+1 protection by OLP(optical line protection) and DCP(2-channel optical path protection) board.
Worry about costly network protection mechanism. You get same flavour using OLP(optical line protection) and DCP(2-channel optical path protection board)- very cost effective way to provide
1. Optical line protection- to ensure the normal receiving of signals when the line fiber fails.
i) OTS trail protection
ii) OMS trail protection
2. Intra-board 1+1 protection-to protect the services of the OTU that has no dual-fed and selective receiving function.
3. Client 1+1 protection- making use of a working OTU and a protection OTU to protect the client-side services.
Protection mechanism: Dual-fed and selective receiving
At the transmit end
Optical interface receives one channel of optical signals. After passing through the splitter, the signals are output to the working and the protection fibers (channels) – means the protected signal is dually fed to the working and protection paths.
At the receive end
The optical power detecting module detects the detection signals that are extracted from the working and protection signals, and reports the detection results to the control and communication module. The control and communication module compares the optical power of the two channels of optical signals, and controls the operation of the optical switch based on the optical power .The working or protection signal is selected if it has the higher power level.
Very Important parameters Can Be Set or Queried by NMS
The Input Power Loss Threshold (dBm)
parameter queries the threshold value of the input optical power, which can trigger a board to generate an optical power loss (MUT_LOS) alarm. When the actual input optical power is lower than this threshold value, the board reports the MUT_LOS alarm.
Variance Threshold Between Primary and Secondary Input Optical Power (dB)
Specifies the difference threshold for the input working and protection signal power levels.
When the difference between the input working and protection signal powers reaches a specific value close to this threshold, a signal fail (SF) condition has occurred. When the difference exceeds this threshold, a POWER_DIFF_OVER alarm is reported and protection switching is performed to select the signal with higher power, ensuring desired service performance.
For 100G or beyond 100G services, you are advised to set Variance Threshold Between Primary and Secondary Input Optical Power (dB) to 3 dB to avoid switching timeout.
Hence, OLP/DCP works by real-time monitoring the power status in working path, it can automatically switch from working path to backup path when the power value of working fiber lower than a user defined threshold . By this way, olp will provide you a more reliable, flexible and high secure optical transmission network ,
it is widely used for protecting backbone and important business line- even you can provide optical ASON protection through using those boards for critical services.
