Practical TCP/IP and Ethernet Networking- P60: 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 | AppendixA Glossary 277 E EBCDIC Extended Binary Coded Decimal Interchange Code. An eight-bit character code used primarily in IBM equipment. The code allows for 256 different bit patterns. EDAC Error Detection And Correction. EEPROM Electrically Erasable Programmable Read Only Memory. Non-volatile memory in which individual locations can be erased and re-programmed. EIA Electronic Industries Association. A standards organization in the USA specializing in the electrical and functional characteristics of interface equipment. EIA-232-C Interface between DTE and DCE employing serial binary data exchange. Typical maximum specifications are 15 m at 19200 baud. EIA-422 Interface between DTE and DCE employing the electrical characteristics of balanced voltage interface circuits. EIA-423 Interface between DTE and DCE employing the electrical characteristics of unbalanced voltage digital interface circuits. EIA-449 General-purpose 37-pin and 9-pin interface for DCE and DTE employing serial binary interchange. EIA-485 The recommended standard of the EIA that specifies the electrical characteristics of drivers and receivers for use in balanced digital multi-point systems. EISA Enhanced Industry Standard Architecture. EMI RFI Electromagnetic Interference Radio Frequency Interference. Background noise that could modify or destroy data transmission. EMS Expanded Memory Specification. Emulation The imitation of a computer system performed by a combination of hardware and software that allows programs to run between incompatible systems. Enabling The activation of a function of a device by a defined signal. Encoder A circuit which changes a given signal into a coded combination for purposes of optimum transmission of the signal. 278 Practical TCP IP and Ethernet networking EPROM Erasable Programmable Read Only Memory. Non-volatile semiconductor memory that is erasable in an ultra violet light and reprogrammable. Equalizer The device which compensates for the unequal gain .
