| Term |
Definition |
| E&M Signaling |
Trunk signaling protocol used between PBX's and CO's. |
| E/O |
Electronic to Optical. |
| E1 |
A dedicated digital communication link provided by a European telephone company that offers 2.048 megabits per second of bandwidth, commonly used for carrying traffic to and from private business networks and Internet service providers. |
| E2PROM |
Electrically Erasable Programmable Read Only Memory. |
| E3 |
A digital transmission link with a capacity of 34.368Mbit/s. |
| EAPROM |
Electrically Alterable Programmable Read-Only Memory. |
| EAROM |
Electrically Alterable Read-Only Memory. |
| EBU |
European Broadcasting Union. |
| Echo |
A signal derived from a primary signal by reflection at one or more impedance dis-continuities and delayed relative to the primary signal. |
| Echo Cancellation |
A technique used in high speed modems and voice ciruits to isolate and filter out unwanted signal energy caused by echoes from the main transmitted signal. |
| Echo Suppresser |
A device that detects speech signals transmitted in either direction on a 4-wire circuit and introduces loss in the opposite direction of speech transmission for suppressing echoes. |
| Echo-Canceller |
A device that reduces echo on a 4-wire path by cancellation of the returned (echo) signal using digital processing techniques. |
| Echo-Signal |
Distortion occurring when a transmitted signal is echoed back (reflected) to the originating station. |
| ECL |
Emitter Coupled Logic. |
| ECO |
Electron Coupled Oscillator. |
| EDGE |
EDGE (Enhanced Data GSM Environment), a faster version of the Global System for Mobile (GSM) wireless service, is designed to deliver data at rates up to 384 Kbps and enable the delivery of multimedia and other broadband applications to mobile phone and computer users. The EDGE standard is built on the existing GSM standard, using the same time-division multiple access (TDMS) frame structure and existing cell arrangements. Ericsson notes that, when available, its base stations can be updated with software. |
| EDRAM |
Enhanced Dynamic Random Access Memory. |
| EEPROM |
Electrically Erasable Programmable Read Only Memory. |
| EEROM |
Electrically Erasable Read Only Memory. |
| EIA |
Electronics Industries Association. |
| ELAN |
Emulated LAN - The ATM segment of a virtual LAN (VLAN) based on the ATM forum LANE standard. A VLAN consists of an ELAN segment along with traditional LAN segment. |
| ELF |
Extremely Low Frequency. |
| Encoder |
In PCM, a device which performs repeated sampling, compression and A/D conversion to convert an analog signal to a serial stream of PCM samples representing the analog signal. Otherwise, a device which modifies information into a standard data form suitable for transmission. |
| Encoding Law |
The law defining the relative values of the quantum steps used in quantization and encoding. |
| End Finish |
The quality of a fiber's end surface. |
| ENOB |
Effective Number Of Bits. |
| ENR |
Enterprise Network Roundtable - An ATM forum associated group of ATM users to provide feedback on ATM-related issues and also present users with completed interoperable capabilities and functionality. |
| EPAC |
Electrically Programmable Analog Circuit. |
| EPLD |
Electrically Programmable Logic Device. |
| EPROM |
Erasable Programmable Read-Only Memory. |
| EQ |
Equalizer. |
| Equalization Pulses |
These are two groups of pulses, one that occurs before the serrated vertical sync and another group that occurs after. These pulses happen at twice the normal horizontal scan rate. They exist to ensure correct 2:1 interlacing in early televisions. |
| Equivalent Four Wire System |
A transmission system which use separate frequency derived channels to allow for full duplex operation over one pair of wires. |
| Error Burst |
An unusually high rate of errors concentrated into a short period of time. |
| Error Correction |
The mechanism used to correct detected errors in a transmission. Correction is normally achieved by retransmissions of information. |
| Error Detection |
The process whereby transmission errors are detected by using simple parity checks or more complex cyclic redundancy checks. |
| ESA |
European Space Agency. |
| ESF |
Extended Superframe Format - A T1 framing format that uses the framing bit to provide maintenance and diagnostic functions. |
| ESI |
End System Identifier - The 6-octet field within the ATM NSAP format address, which identifies an end system. Equivalent to the MAC address of the device. |
| ESMR |
Enhanced Specialised Mobile Radio. |
| ETACS |
European Total Access Communications System. |
| E-TDMA |
Extended TDMA - developed to provide fifteen times the capacity over analog systems by compressing quiet time during conversations. |
| Ethernet |
A local area network allowing several computers to transfer data on a communications cable. |
| ETS |
European Telecommunications Standard. |
| ETSI |
European Telecommunications Standards Institute. ETSI is a non-profit organization producing voluntary telecommunications standards used throughout Europe, some of which have been adopted by the EC as the technical base for Directives or Regulations. |
| Extended Addressing |
Methods used to expand an address structure beyond it's normal limits. |
| Extended LAN |
A local area network which has had it's dimensions extended by the use of bridges. |
