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Digital Interfaces in Measurement Systems
Published in Robert B. Northrop, Introduction to Instrumentation and Measurements, 2018
In describing the venerable RS-232C interface, we encounter some new acronyms. RS-232C serial communications are sent by data terminal equipment (DTE) and data communications equipment (DCE). DTE include such things as computer terminals, teleprinters, computers, and digital instruments. DCE are devices (modems) that encode the serial digital signals into low-bandwidth (sinusoidal) formats compatible with transmission on voice band telephone lines. The rate that modems transmit data is given in baud, which stands for bit rate audio. (Modern modems used for serial telephone line communications between PCs and instruments typically run between 2,400 baud and 56,000 baud, depending on the limiting bandwidth of the transmission system. FAX modems typically run at 24,400 baud.) Just as the GPIB has a unique, standard connector, the RS-232C interface uses a standard male or female 25-pin, DB25P (male) or DB25S (female) connector, shown in Figure 9.28.
Computing System Elements
Published in Stephen Horan, Introduction to PCM Telemetering Systems, 2017
The TIA-232 standard defines two actors in the data interface: the Data Terminal Equipment (DTE) and the Data Communications Equipment (DCE). Generally, the DTE is the host device such as a computer and the DCE is the peripheral device. The standard defines a number of control circuits to provide the handshakes between the actors. However, for most interactions between a host computer and a peripheral, a simple five-wire set of lines suffices. To save space in the system, designers generally opt to use DE-9 connectors rather than DB-25 connectors. In either case, the DTE typically has the male connector and the peripheral device has the female connector, but this is not required in the standard. Table 4.1 provides the pin assignments for the five-wire interface. In the table, we show two variants of the signal connection: the null modem for full-duplex communications and the straight through for half-duplex communications. The designer needs to know which type of cable is required for the peripheral. Generally, manufacturers use the same types of plugs for both cable types although the cables cannot be mixed (this author always labels them with a permanent marker upon taking them from the packaging before putting them into use).
Have phone, will travel: Inmarsat services
Published in Jonathan Higgins, Satellite Newsgathering, 2012
Interface conversion between the S0 bus and the serial communications interface on the subscriber data terminal equipment (DTE) is carried out using an ISDN terminal adapter (TA). The TA is typically packaged in a similar fashion to modems, i.e. either as a stand-alone unit or as a built-in PC card. A stand-alone TA is supplied configured with a serial communications interface such as RS.232, V.35 or X.21; the interface is normally specified by the subscriber according to the application. Nowadays most equipment capable of being used with ISDN can be supplied with an integral ISDN basic rate interface (BRI). The DTE can be any type of data equipment such as a video-conferencing or videophone system, bridge/router or audio codec. The TA is also known as the data communications equipment (DCE).
A Survey on Packet Switching Networks
Published in IETE Journal of Research, 2022
The devices are divided into two main categories when connected to a Frame Relay WAN: Data terminal equipment (DTE) and Data circuit-terminating equipment (DCE). DTEs are often located on the premises of a customer and are considered termination equipment for a specific network. In reality, the consumer may own them. Personal computers, bridges, routers, and terminals are examples of DTE devices. DCEs are internetworking devices that are owned by the carrier. DCE are responsible for transferring data over the WAN, and another purpose of DCE is to help provide switching and network clocking services [11] figure 11.