See Transmission (mechanics) for a car's transmission system In telecommunications, a transmission system is a system that transmits a signal from one place to another. The signal can be an electrical, optical or radio signal. The goal of a transmission system is to transmit data accurately and efficiently from point A to point B over a distance, using a variety of technologies such as copper cable and fiber optic cables, satellite links, and wireless communication technologies. The International Telecommunication Union (ITU) and the European Telecommunications Standards Institute (ETSI) define a transmission system as the interface and medium through which peer physical layer entities transfer bits. It encompasses all the components and technologies involved in transmitting digital data from one location to another, including modems, cables, and other networking equipment. The ITU and ETSI definition of a transmission system is as following:The interface and transmission medium through which peer physical layer entities transfer bits.Some transmission systems contain multipliers, which amplify a signal prior to re-transmission, or regenerators, which attempt to reconstruct and re-shape the coded message before re-transmission. One of the most widely used transmission system technologies in the Internet and the Public switched telephone network (PSTN) is synchronous optical networking (SONET). Also, transmission system is the medium through which data is transmitted from one point to another. Examples of common transmission systems people use everyday are: the internet, mobile networks, cordless cables, etc. Digital transmission system The ITU defines a digital transmission system as a system that uses digital signals to transmit information. In a digital transmission system, the data is first converted into a digital format and then transmitted over a communication channel. The digital format provides a number of benefits over analog transmission systems, including improved signal quality, reduced noise and interference, and increased data accuracy. ITU defines digital transmission system (DTS) as following:A specific means of providing a digital section.The ITU sets global standards for digital transmission systems, including the encoding and decoding methods used, the data rates and transmission speeds, and the types of communication channels used. These standards ensure that digital transmission systems are compatible and interoperable with each other, regardless of the type of data being transmitted or the geographical location of the sender and receiver. Basic components of a DTS Point-to-point links are communication systems between two endpoints, usually a sender (transmitter) and a receiver. System performance analysis: Link power budget is a