TAILIEUCHUNG - Practical TCP/IP and Ethernet Networking- P59

Practical TCP/IP and Ethernet Networking- P59: The transmitter encodes the information into a suitable form to be transmitted over the communications channel. The communications channel moves this signal as electromagnetic energy from the source to one or more destination receivers. The channel may convert this energy from one form to another, such as electrical to optical signals, whilst maintaining the integrity of the information so the recipient can understand the message sent by the transmitter | 212. Practical TCP IP and Ethernet networking ASCII American Standard Code for Information Interchange. A universal standard for encoding alphanumeric characters into 7 or 8 binary bits. ASIC Application Specific Integrated Circuit Abstract Syntax Notation One. An abstract syntax used to define the structure of the protocol data units associated with a particular protocol entity. Asynchronous Communications where characters can be transmitted at an arbitrary unsynchronized point in time and where the time intervals between transmitted characters may be of varying lengths. Communication is controlled by start and stop bits at the beginning and end of each character. Attenuation The decrease in the magnitude of strength or power of a signal. In cables generally expressed in dB per unit length. Attenuator A passive network that decreases the amplitude of a signal without introducing any undesirable characteristics to the signals such as distortion . AUI cable Attachment Unit Interface Cable. Sometimes called the drop cable to attach terminals to the transceiver unit. AWG American Wire Gauge. B Balanced circuit A circuit so arranged that the impressed voltages on each conductor of the pair are equal in magnitude but opposite in polarity with respect to ground. Bandwidth The range of frequencies available expressed as the difference between the highest and lowest frequencies is expressed in hertz or cycles per second . Also used as an indication of capacity of the communications link. Base address A memory address that serves as the reference point. All other points are located by offsetting in relation to the base address. Baseband Baseband operation is the direct transmission of data over a transmission medium without the prior modulation on a high frequency carrier band. Baud Unit of signaling speed derived from the number of events per second normally bits per second . However if each event has more than one bit associated with it the baud rate and bits per .

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