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TN12OLP is a type of optical protection unit, the OLP board provides optical line protection, intra-board 1+1 protection, and client-side 1+1 protection.
TN12OLP functions and features
|Basic function||Provides optical line protection to ensure the normal receiving of signals when the line fiber fails. Provides intra-board 1+1 protection to protect the services of the OTU that has no dual-fed and selective receiving function. Provides client-side 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, the protected signal is dually fed to the working and protection paths. At the receiving end, the working or protection signal is selected if it has a higher power level.)|
The OLP board consists of the optical module, control and communication module, and power supply module.
1. Transmit direction
The TI optical interface receives one channel of optical signals. After passing through the splitter, the signals are output to the working and protection fibers (channels) through the TO1 and TO2 optical interfaces.
2. Receive direction
The signals in the working and the protection fibers (channels) are input through the RI1 and RI2 optical interfaces and then transmitted to the optical switch. The optical switch selects one from the two channels of signals based on the optical power of the signals. In this way, the selection of signals from the working and the protection channels is achieved. The selected optical signals are output through the RO optical interface.
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. In this way, the selection of signals from the working and the protection channels is achieved.
1. Optical module
The optical module consists of a signal dual-fed part and a signal selection part.
Signal dual-feeding part
Divides the one channel of optical signals into two channels of the same power, and outputs them to the working and protection channels.
Signal selective receiving part: receives the optical signals from the working and protection channels. The optical power detection module detects and reports the optical power of two optical signals, and then the control and communication module controls and implements the selective receiving of optical signals from the working and protection channels.
2. Control and communication module
Controls operations on the board.
Controls operations on each module of the board according to CPU instructions.
Collects information about alarms, performance events, working states and voltage detection from each functional module on the board.
Communicates with the system control and communication board.
3. Power supply module
Converts the DC power supplied by the backplane into the power required by each module on the board.
|Optical Interface Parameter|
|TI-TO1 TI-TO2||Insertion loss at the transmit end(dB)||<=4||<=4||<=4|
|RI1-RO RI2-RO||Insertion loss at the receive end(dB)||<=1.5||<=1.5||<=1.5|
|Range of the input optical power(dBm)||-35 to 7||-30 to 23||-32 to 23|
|Operating wavelength range(nm)||1270 to 1350, 1528 to 1567||1270 to 1350, 1528 to 1567||1528 to 1567|
|Switching threshold of optical power difference(dB)||5||5||5|
|Range of the alarm threshold for the optical power difference(dB)||3 to 8||3 to 8||3 to 8|
|Dimensions(mm)||76.2(W) x 220(D) x 264.6(H)|