Shulou(Shulou.com)11/24 Report--

Optical fiber is an important part of communication transmission. When the optical fiber is broken, if the output optical power of the optical amplifier board is not reduced in time, the laser leaked at the fracture will burn or even blind (the optical power is more than 10 dBm).

Don't worry, there is a function in the transmission system that is responsible for reducing the laser power to a safe level when the optical fiber is broken. This function is called APR-AOSD (Automatic Power Reduction-Auto Optical Shutdown Group).

When the optical cable fails, the APR-AOSD group function starts automatically. The output light power of the light amplifying veneer in the OTS (Optical Transmission Section) section is reduced to a safe level, so as to avoid laser damage to the human body. When the optical cable is repaired, the system returns the optical magnifier board to its normal working state.

1. APR-AOSD group key composition APR-AOSD group is composed of controller, monitor and actuator. When the optical cable fails, the monitor reports the input no light alarm to the controller, and the controller sends the order to turn off the laser to the actuator, so as to turn off the laser of the optical amplifier board finally.

2. The workflow of APR-AOSD group. Let's take a look at the workflow of APR-AOSD group in networking scenarios:

The loss of optical signal continuity is detected at the receiving port R2 of the monitor OA2 and reported to the controller.

The controller sends a command to turn off the laser to the actuator OA3, and the actuator OA3 turns off the laser.

The loss of optical signal continuity is detected at the receiving port R1 of the monitor OA4 and reported to the controller.

The controller sends a command to turn off the laser to the actuator OA1, and the actuator OA1 turns off the laser.

This whole process ensures that the optical power in the OTS section where the fault is located is at a safe level and avoids the harm caused by high power laser to the human body.

3. APR-AOSD group recovery mechanism when the optical cable is repaired, the APR-AOSD group function can restore the business to normal operation through its own automatic restart recovery mechanism. The specific process is as follows:

The system automatically increases the transmission optical power of T1 port to a reasonable level at regular intervals, which can not only ensure safety, but also ensure that the monitor can still be recognized after attenuation.

If the fiber fault is fixed, the receiving port R2 is no longer in the LOC-OTS state, so the T2 transmit port signal returns to the normal working state, that is, the system returns the OA3 to the normal working state.

When the T2 transmit port signal returns to normal, the receiving port R1 is no longer in the LOC-OTS state, so the T1 transmit port signal returns to the normal working state.

What if the fiber is not restored during the T1 signal restart? Then the LOC-OTS state at R2 cannot be released, and the T1 transmission signal is reduced to safe power again and enters the next automatic restart process.

In this way, the whole system returns to normal transmission.

This is all about the APR-AOSD group ~ lovely communicators, to ensure the smooth flow of the network, and our APR-AOSD group silently guarded our communicators!

This article comes from the official account of Wechat: ZTE document (ID:ztedoc), author: ZTE document

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