Configuration of alarm information for incorrect optical fiber connections on WDM products

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On OTN devices, the OTS-layer TTI bytes can be set on FIU boards to support incorrect connection detection for an OTS section. When incorrect connections are detected, OSC boards report alarms. This function is disabled by default. You can manually enable the function and set the TTI bytes.

1. Enable the OTS_TIM alarm monitoring function.
2. Configure the TTI bytes on both ends of the OTS section. When the OTS optical fiber connection is abnormal, the OTS_TIM alarm will be reported.

Other related questions:
Configuration of the precaution information about wrong optical fiber connections on WDM products
Question: When a large number of optical cables are connected on the same span of a WDM device, if an optical cable is incorrectly connected, the OTU alarm is reported. There is a low probability that after optical fibers with the same wavelength information on the main optical path are incorrectly connected, no alarm is reported. As a result, it is difficult to locate the fault and greatly prolongs the troubleshooting duration. Answer: OTN devices support TTI configuration settings on the OTS layer to support wrong connection detection of the OTS segment. The configuration is on the FIU board, and the alarm reporting is triggered by OSC board testing. This function is disabled by default. Manually enable the function and configure the TTI bytes as follows: 1. Enable the OTS_TIM alarm monitoring function; 2. Configure the TTI bytes on both ends of the OTS. When the OTS optical fiber connection is abnormal, the OTS_TIM alarm will be reported.

Method used to determine whether optical fiber connections are correct between a router and a WDM board on the client-side of WDM equipment
Disable the ALS function for the client-side laser of the WDM board and enable the laser to forcibly emit light. If the optical port on the router receives optical signals, the optical fiber in the transmit direction is correctly connected. Stop the router from emitting light. If the WDM board reports an R_LOS alarm, the optical fiber in the receive direction is correctly connected.

Optical fiber connections of the TN12OAU board
One multiplexed optical signal received at the IN port is sent to the EDFA optical module. The EDFA optical module amplifies the optical power of the signal and locks the gain of the signal. The signal is then transmitted to the DCM board through the TDC port for dispersion compensation. Then, the signal is sent back through the RDC port. The amplified multiplexed signals are output through the OUT port. The multiplexed signal can also be input through the VI port and output through the VO port after the optical power is adjusted. Then, the IN port receives the multiplexed signal sent from the VO port.

Fiber connections on the optical ports of the WMU board
The IN1 and IN2 optical ports on the WMU board separately connect to the MON port on two OA or FIU/ITL boards configured in two different transmit directions for centralized wavelength monitoring.

Product series of the WDM product family
Huawei WDM/OTN series end-to-end intelligent optical transport platforms are applicable to the backbone core layer, metro core layer, metro convergence layer, and metro edge access layer. These series platforms support universal switching and flexible grooming for OTN, SDH, and packet services, coherent technology-based, large-capacity, and ultra-long 100G and 40G transmission, WSS-based dynamic optical-layer grooming at ROADM sites, and the ASON/GMPLS control plane. Facilitated by these platforms, carriers can enjoy more flexible transmission, quicker service provisioning, more reliable network, and easier maintenance, therefore ensuring better services and generating more profits. OTN-based new-generation WDM products have the following product series: OptiX OSN 1800: It is mainly applicable to the metro edge layer, including the metro convergence layer and metro access layer. On small-capacity networks, it is also applicable to the core layer. OptiX OSN 3800: It is mainly applicable to the metro convergence layer and metro access layer. OptiX OSN 6800: It is applicable to long-haul backbone networks, regional backbone networks, local networks, the metro convergence layer, and the metro core layer. OptiX OSN 8800: It is mainly applicable to the backbone core layer, and is also applicable to the metro core layer and metro convergence layer. OptiX OSN 9800: It is developed to satisfy the requirements for ultra large capacities and bandwidth.

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