Symphony Communication Public Company Limited is a Thailand-based data communication service provider. It is a domestic network provider of high-speed telecommunication circuits operating under the name of Symphony. The Company uses fiber optics and network equipment to support the network infrastructures for corporations and institutes in Bangkok and its vicinities. The Company's services include ready ethernet, which utilizes a series of fiber optics to cover data transmission across buildings; metro ethernet, which is a horizontal network service to other buildings, and time division multiplexing (TDM), which is a leased-line service that combines data streams to transmit a fixed sequence of time slots over a single transmission channel. In addition, the Company provides synchronous digital hierarchy (SDH) services, ethernet over synchronous digital hierarchy (EoSDH) services and dark fiber services.