TN12OLP

TN12OLP overview

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.

This board can be applied on the subrack of OSN6800OSN6800 / OSN8800.

TN12OLP functions and features

The OLP board consists of the optical module, control and communication module, and power supply module.

Signal Flow

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.

Module Function

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.