Data Communications Circuits (Part 1) PDF

DATA COMMUNICATION Data Communications Hardware Instructor: Engr. Rose Anne L. Reano PUP Sto. Tomas Branch Data Communications Hardware Human Communications Digital Data Communications  Data Communications Hardware All endpoints must have three fu...

DATA COMMUNICATION Data Communications Hardware Instructor: Engr. Rose Anne L. Reano PUP Sto. Tomas Branch Data Communications Hardware Human Communications Digital Data Communications  Data Communications Hardware All endpoints must have three fundamental components: data terminal equipment, data communications equipment, and a serial interface.  Data Terminal Equipment Data terminal equipment (DTE) can be virtually any binary digital device that generates, transmits, receives, or interprets data messages. In essence, a DTE is where information originates or terminates.  Data Terminal Equipment Data terminal equipment includes the concept of terminals, clients, hosts, and servers.  Data Terminal Equipment Terminals are devices used to input, output, and display information, such as keyboards, printers, and monitors. A client is basically a modern-day terminal with enhanced computing capabilities.  Data Terminal Equipment Hosts are high-powered, high capacity mainframe computers that support terminals. Servers function as modern-day hosts except with lower storage capacity and less computing capability.  Data Communications Equipment Data communications equipment (DCE) is a general term used to describe equipment that interfaces data terminal equipment to a transmission channel, such as a digital T1 carrier or an analog telephone circuit.  Data Communications Equipment In essence, a DCE is a signal conversion device, as it converts signals from a DTE to a form more suitable to be transported over a transmission channel.  Data Communications Equipment There are several types of DCEs, depending on the type of transmission channel used. Common DCEs are channel service units (CSUs), digital service units (DSUs), and data modems.  Data Communications Circuit A data modem is a DCE used to interface a DTE to an analog telephone circuit commonly called a POTS.  Data Communications Circuit A two-point data communications circuit is comprised of the seven basic components: 1. DTE at endpoint A 2. DCE at endpoint A 3. DTE/DCE interface at endpoint A 4. Transmission path between endpoint A and endpoint B 5. DCE at endpoint B 6. DTE at endpoint B 7. DTE/DCE interface at endpoint B Data Communications Circuit  Data Communications Circuit The circuit is arranged in a bus topology with central control provided by a mainframe computer (host) at endpoint A.  Data Communications Circuit The host station is sometimes called the primary station.  Data Communications Circuit Endpoints B and C are called secondary stations.  Data Communications Circuit At the primary station, there is a mainframe computer, a front-end processor (DTE), and a data modem (DCE).  Data Communications Circuit At each secondary station, there is a modem (DCE), a line control unit (DTE), and a cluster of terminal devices (personal computers, printers, and so on).  Data Communications Circuit The line control unit at the secondary stations is referred to as a cluster controller, as it controls data flow between several terminal devices and the data communications channel. Question  Question Give some examples of data terminal equipment.  Question Give examples of data communications equipment.  Question List and describe the basic components that make up a data communications circuit.  End-of-Slide THANK YOU FOR LISTENING!