Optical Transmission Network Technology provides Huawei SDH transmission equipment, broadband access equipment and Huawei switching equipment with a variety of trunk cables, single boards and accessories.

I. Huawei STM-4 (622M) Optical Interface Board Overview

Huawei STM-4 (622M) optical interface board supports the reception and transmission of STM-4 optical signals, completes the photoelectric conversion of STM-4 signals, extracts and inserts overhead bytes, and reports alarms generated on the line.The STM-4 optical interface boards in the SDH veneer boards are: SL4, SL4A, SLD4, SLD4A, SLQ4, SLQ4A, and each type of board has a distance difference. boards have distance difference, according to customer demand, configure the corresponding boards.
Second, the working principle and signal flow of STM-4(622M) optical boards

SL4, SL4A single board consists of photoelectric conversion module, data clock recovery unit, SDH overhead processing module, logic control module and power supply module.

SLD4, SLD4A, SLQ4, SLQ4A single board consists of photoelectric conversion module, SDH overhead processing module, logic control module and power supply module.

C. The Huawei transmission board STM-4 optical interface board models are described as follows:

Finished board unit-OptiX OSN 1500-SSR1SL4-STM-4 optical interface board

Finished board unit-OptiX OSN 3500-SSN1SL4A-STM-4 Optical Interface Board

Finished Board Unit-OptiX OSN 1500-SSR1SLD4-2xSTM-4 Optical Interface Boards

Finished Board Unit-OptiX OSN 3500-SSN1SLD4A-2xSTM-4 Optical Interface Board

SSN1SLQ4-4xSTM-4 Optical Interface Board

Finished Board Unit-OptiX OSN 3500-SSN1SLQ4A-4xSTM-4 Optical Interface Board