#osn7500

Automatic laser shutdown is a procedure to automatically shut down the laser when there is no input light and stop emitting optical signals on OSN7500. This function reduces the working time of lasers and extend the service life of lasers. In addition, this function avoids the damage to human bodies due to laser leakage.

Prerequisites

·     You are an NM user with Operator Group rights or higher.

·     The optical interface board must be created and must work normally.

Impact on System

when a fault occurs to the fiber, or the received optical signals are lost, the laser is automatically off, interrupting the services in the transmit direction of the board where the laser is located.

The board where the laser is located periodically checks whether an LOS alarm is reported in the receive direction of the laser. If the ALS function is enabled for the laser, the board automatically starts the transmit optical module of the laser when the LOS alarm clears in the receive direction.

Tools, Equipment, and Materials

U2000

Procedure

1.     In the Workbench view, double-click Main Topology to display the main topology.

2.     Select the required NE, right-click it, and choose NE Explorer from the shortcut menu.

3.     In the NE Explorer, select a board and choose Configuration > Automatic Laser Shutdown from the Function Tree.

4.     Set Automatic Shutdown to Enabled. Set the On Period, Off Period, and Continuously On-test Period.

HUAWEI OptiX OSN 7500 Subrack Description

Structure

The OptiX OSN 7500 subrack has a two-layer structure. The subrack consists of the slot area for processing boards, slot area for interface boards, fan area and fiber routing area.

Figure 1 shows the structure of the OptiX OSN 7500 subrack.

Figure 1 Structure of the OptiX OSN 7500 subrack 

The functions of these areas are as follows:

Upper and lower slot…

HUAWEI OptiX OSN 7500 Interface Function

The OptiX OSN 7500 intelligent optical switching system (hereinafter referred to as the OptiX OSN 7500) is the next-generation intelligent optical core switching (OCS) equipment and is developed by Huawei on the basis of the current situation and development trend of the metropolitan area network (MAN).

The OptiX OSN 7500 is the optical core switching (OCS) equipment. It is a next generation…

HUAWEI OptiX OSN 7500 Specification and Network Application Fueatures

  Network Application

Huawei OptiX OSN 7500 intelligent optical switching system (hereinafter referred to as the OptiX OSN 7500) is the next-generation intelligent optical core switching (OCS) equipment and is developed by Huawei on the basis of the current situation and development trend of the metropolitan area network (MAN).

The OptiX OSN 7500 is the optical core switching (OCS) equipment. It…

The OptiX OSN equipment, like Huawei OSN3500 / OSN7500 supports in-service detection of optical power and provides he automatic laser shutdown (ALS) function.

ALS Function

The OptiX OSN equipment, like Huawei OSN3500 / OSN7500, provides the automatic laser shutdown (ALS) function for the SDH optical interfaces.

When a fiber that connects two optical interfaces is cut, an R-LOS alarm is generated at the optical interface of the local end. If the R_LOS alarm lasts for 500 ms, the laser of the transmit optical interface at the local end is automatically shut down. By default, the laser pulse is generated at a 60-second interval and lasts for 2s every time.

After the fiber connection is restored, the optical interface at the opposite end detects the laser pulse generated from the local end. The laser of the optical interface at the opposite end then continuously launches laser beams. After receiving the laser beams launched by the opposite end, the laser of the local end then also continuously launches the laser beams. As a result, the two optical interfaces can communicate with each other and the R-LOS alarm is cleared.

The automatic laser shutdown (ALS) function complies with ITU-T G.664.

Optical Power Management

The OptiX OSN equipment supports in-service detection of the optical power of SDH optical interfaces and Ethernet optical interfaces.

The OptiX OSN equipment provides the function to query the parameters of the optical module. The parameters that can be queried include the optical interface type, fiber mode (single-mode or multi-mode), transmission distance, transmission rate, and wavelength.

The optical interface board uses the pluggable optical module. Users can choose single-mode or multi-mode optical modules according to the requirement, which facilitates the maintenance.

The optical power threshold of the boards can be queried.

The OptiX OSN 3500 supports hybrid networking with the RTN equipment, therefore implementing end-to-end management.

As shown in Figure 1, hybrid networking allows more flexible reform of the existing network and optimal utilization of the network resources.

In the preceding typical networking, the OptiX OSN 1500 or OptiX RTN equipment is used at the access layer.

The OptiX OSN 3500/7500 is often used at the convergence/backbone layer.

See Figure 1. In packet domain, the equipment at the access layer, such as the OptiX OSN 1500 or the OptiX RTN equipment, accesses the FE services from the NodeB, and transmits the FE services to the GE packet ring, then to the 10GE convergence/backbone ring, and finally to the RNC. In this manner, the FE services from the base stations are transmitted to the RNC in an end-to-end manner.

See Figure 1. In TDM domain, the equipment at the access layer, such as the OptiX OSN 1500 accesses the E1 services from the BTS to the STM-1/STM-4 ring consisting of the MSTP equipment and then transmits the service to the STM-16/STM-64 ring consisting of the OptiX OSN equipment (convergence/backbone layer) and finally to the BSC. In this manner, the E1 services from the BTS are transmitted to the BSC in an end-to-end manner.

The OptiX OSN equipment can use the EoS service dividing board to directly access Ethernet services through the TDM ring at the access layer. Figure 2 shows how this function is realized.

As the packet service increases, the EoS service dividing board provides a solution for the expansion of the SDH network and improves the utilization of the equipment at the access layer.

In the preceding typical networking diagram, the OptiX OSN 1500 or the OptiX OSN 500/550 is generally used at the access layer, and the OptiX OSN 3500/7500/7500 II is generally used at the convergence/core layer.

As shown in Figure 2, only the TDM domain is available at the STM-1/STM-4 access layer. The OptiX OSN 1500 transmits the E1 and FE services that are accessed by the base station to the OptiX OSN 3500/7500/7500 II.

Before using this manual, the commissioning personnel must receive trainings on the optical network equipment. They also should be skilled in using the commissioning tools. The commissioning personnel must attain familiarity with the following items:

Knowledge on SDH (Synchronous Digital Hierarchy), PDH (Plesiochronous Digital Hierarchy, and Ethernet

Knowledge of OptiX OSN 2500

How to use the T2000 to configure services

How to use the T2000-LCT to configure services

How to use the commissioning meters (SDH, PDH, Ethernet)

More related:

Huawei OSN3500

Huawei OSN7500

Safety Precautions when Commissioning the OptiX OSN 2500

iManager U2000 Single-Server System Software Installation Guide