PDH optical multiplexer is a kind of point-to-point optical transmission equipment developed by our company on the core of large-scale integrated circuit chips. It is applicable to remote transmission of switches, and small/medium-capacity applications transmitted over fibers, including mobile communication base stations, wireless local communication base stations and paging stations. The equipment features perfect overall performance, stable and reliable operation, low power consumption, high integration, small size and easy installation and maintenance. It is intended for carries and such fields as post and telecommunications, electrical power, railway, water resources, oilfields, and banks.