E
EAP Extensible Authentication Protocol. A mechanism for encapsulation of authentication credentials within a PPP-formatted frame. 802.1x uses a special format of EAP (EAPOL, or EAP over LAN) to send EAP authentication messages within Ethernet-type frames between an authenticator (for example, an AP) and a RADIUS server.
EAP-TLS An EAP type defined by IETF (RFC 2284) that uses client and server digital certificates to authenticate users.
EIRP Effective Isotropic Radiated Power. A term for expression of the performance of an antenna in a given direction (main lobe of the transmitter antenna) relative to the performance of a theoretical (isotropic) antenna; it is expressed in dBm. EIRP is calculated by adding the sum of the antenna gain (in dBi) plus the power (in dBm) into that antenna minus any loss (attenuation) caused by antenna cable, connectors, and so on.
electromagnetic spectrum The full range of electromagnetic (same as magnetic) frequencies, a subset of which is used in commercial RF systems.
down tilt.
EMI/RFI electromagnetic interference/radio frequency interference. Broad spectrum noise or interfering signals.
encryption Modification of a bit stream so that it appears random. Encryption is used for security purposes. The sender and receiver must both use the same encryption method.
ERP Effective Radiated Power. The product of the transmitter peak envelope power, expressed in watts, delivered to the antenna, and the relative gain of the antenna over that of a half-wave dipole antenna.
Ethernet Ethernet is a type of wired network that supports high-speed communications among devices over a specified cable.
ETSI European Telecommunications Standards Institute. The standards body responsible for regulating telecommunications. The role of ETSI is develop technical standards aimed at achieving a large unified European telecommunications market.
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