Conditions for SFIU boards to report MUT_LOS alarms

51

Question:
When no service is deployed on new TN11SFIU boards at a site, some of the new SFIU boards report the MUT_LOS alarm whereas the others do not.
Analysis:
The SFIU boards do not detect optical power and do not report the MUT_LOS alarm alone. OA boards are required to produce the MUT_LOS alarms, and the conditions to produce the MUT_LOS alarms are as follows.
Answer:
The conditions are: 1. There are logical fiber connections. 2. The OA board in the receive direction reports an MUT_LOS alarm. 3. The OA board in the transmit direction does not report any MUT_LOS alarms. 4. The OSC_LOS alarms are ignored.

Other related questions:
Whether the FIU board reports the MUT_LOS alarm
Yes, it does.

Conditions for the MCA board of the BWS 1600G to determine a wavelength loss and report the CHAN_LOS alarm
Question: What is the condition for the MCA board to report the CHAN_LOS alarm when wavelength monitoring configurations are correct? CHAN_LOS Answer: The MCA board determines a wavelength loss when it detects the following wavelength conditions: 1. The optical power is lower than -40 dBm. 2. The optical power is greater than 5 dBm. 3. A wavelength exceeds the standard wavelength by ±0.14 nm. 4. The signal-to-noise ratio is smaller than 7.5 dB. 5. If the difference between the maximum and minimum optical power is greater than 10 dB, the MCA board determines that the wavelength with the minimum optical power is lost.

Differences of the MUT_LOS and R_LOS alarms on OA boards of WDM devices
Question: On Huawei WDM devices, why some OA boards report the R_LOS alarm whereas some OA boards report the MUT_LOS alarm when they do not receive any light or the receive optical power is excessively low? Analysis: None Answer: When the OA boards (such as WPA, WBA, and WLA) on 320G devices do not receive any optical signals, the R_LOS alarm is reported. When the OA boards (such as OPU, OBU, and OAU) on 1600G, 800G, and 400G devices do not receive any optical signals, the MUT_LOS alarm is reported. Suggestion and conclusion: The R_LOS alarm is used to indicate the loss of input optical signals on a single wavelength of a board such as OTU. The MUT_LOS alarm is used to indicate the loss of multiplexed optical signals on a board such as M40, D40, OAU, OBU, or OPU. It is inaccurate that the R_LOS alarm is reported when OA boards do not receive any optical signals. Therefore, the R_LOS alarm is canceled for new OA boards. When developing new 1600G, 800G, and 400G WDM systems, Huawei adjusts the alarm that is reported when OA boards do not receive any optical signals. To be specific, the OA boards report the MUT_LOS alarm when receiving no optical signals.

Functions of the SFIU board
The SFIU board is an optical multiplexing and demultiplexing unit. It multiplexes and demultiplexes signals transmitted over the main optical channel and OSC, avoiding commissioning and compensation for IEEE 1588v2 signals.

Fiber connections for the SFIU boards
The fiber connections for SFIU boards vary depending on their positions on the NEs and networks.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top