Glossary - E

E

E-911 Service

An emergency call service that routes 911 calls to a Public Safety Answering Point.

EAS

See Extended Area Service.

Echo Return Loss (ERL)

A frequency-weighted measure of return loss over the middle of the voice band (approximately 560 to 1965 Hz) where talker echo is most annoying.

EDI

See Electronic Data Interchange.

EGP

See Exterior Gateway Protocol.

Electronic Bonding (EB)

An electronic interface that allows a local exchange carrier's (LEC's) customer to connect their Operations Support Systems (OSS) with the LEC's OSS in support of specific customer network management system, such as Trouble Administration.

Electronic Commerce

A set of services which enable the secure exchange of electronic funds via the internet. Generally, E-Commerce is referred to in relation to websites that promote products and services for immediate sale.

Electronic Data Interchange (EDI)

Industry standard method of electronically exchanging data such as orders, invoices, etc. between two different locations or organizations.

Email (or E-Mail)

An abbreviation for electronic mail, which is a network service that allows users to send and receive messages via computer. The Internet and common message protocols makes it possible to send and receive email messages worldwide.

End Office (EO)

1. A central office to which a telephone end user is connected; the final central office before the end user's telephone.
2. The central office trunking/switching entity where telephone loops are terminated for purposes of interconnection to each other and to the network.

End Office Connection (EOC)

The interconnection between a Verizon end office and another service provider's switching entity/Point of Interface, over which traffic may flow between the end office and its remotes, and the other service provider's switching entity/Point of Interface.

End Office Switch

A local exchange carrier switching system, where telephone exchange service customer station loops are terminated for purposes of interconnection to trunks. In the case of a Remote Switching Module, the term, End Office Switch, designates the combination of the Remote Switching Module and its host.

End User

Any customer of a telecommunications service that is not a carrier, except for the following exceptions:

1. A carrier other than a telephone service provider is considered to be an "end user," when the carrier uses a telecommunications service for administrative purposes.
2. A person or entity that offers telecommunications services exclusively as a Reseller is considered to be an "end user" if all resale transmissions offered by the reseller originate on the premises of the reseller.

Enhanced Service Provider

Provider of a broad range of computer applications that use the telecommunications network. These applications include information retrieval, database services, packet switching and others.

Enterprise Network

A geographically dispersed network under the auspices of one organization.

Entrance Facility

Point of interconnection between the local exchange carrier's (LEC) Rate Demarcation Point and the external carrier's Point of Presence(POP).

Entry Switch

The first telephone service provider location at which switching occurs on the terminating path of a call originating from the customer premises to the terminating end office. Also, the last telephone service provider location at which switching occurs. Also known as First Point of Switching.

Equal Access

As defined by the Modified Final Judgment, a uniform method by which Interexchange Carriers are accessed by end-users.

Erlang Forecast

An engineering formula for forecasting capacity for required telephone service provider facilities.

Ethernet

A 100-Mbps technology based on the 10BASE-T Ethernet CSMA/CD network access method to accommodate the operation of local area networks (LANs).

Ethernet Local Area Network (ELAN)

A connection-less Switched Ethernet Service (SES) that allows connectivity among multiple customer-designated locations within a LATA. With the ELAN service type, SES helps to protect data privacy by using closed user groups (CUGs), also known as virtual LANs. CUGs or virtual LANs are used to enhance traffic separation, privacy and security between customers on the shared switch and backbone. Subscribers in a CUG can only access their own data. An ELAN domain is comprised of any number of access lines designated by the customer to be included in a closed user group (CUG) or virtual LAN. ELAN provides multipoint-to-multipoint connectivity among all of the customer's access lines within a given domain.

Ethernet Virtual Private Line Converge Packet Access (EVPL-CPA)

A point-to-point or point-to-multipoint service over a shared backbone network.

Ethernet Virtual Private Line - LEC (EVPL-LEC)

A connection-oriented Switched Ethernet Service (SES) that allows for point-to-point connectivity between customer-designated locations within a LATA. With the EVPL service type, an Ethernet Virtual Circuit (EVC) establishes a virtual LAN or CUG. An EVPL domain is comprised of any number of virtual LANs designated by the customer to be included in the EVPL domain. EVPL provides point-to-point connectivity between pairs of customer's access lines, Internet virtual circuits and shared network virtual circuits within a given domain. A customer may have more than one domain within a LATA, but connections between domains are not permitted. SES may be used to access shared networks. In such cases, subscribers in a CUG can only access their own data.

Ex Parte

Any communication addressing the merits of a particular proceeding (such as a judicial proceeding), which is made to decision-making personnel by other persons, where all parties to the proceedings are not present.

Exchange

A unit generally smaller than a LATA, established by the local exchange carrier (LEC) for the administration of communications service in a specified area (usually a city, town, or village and its environs). An exchange consists of one or more central offices together with the associated facilities used to provide communications services within that area. One or more designated exchanges comprise a given LATA.

Exchange Access

As defined in the Telecommunications Act of 1996, the offering of access to telephone exchange services or facilities for the purposes of the origination or termination of telephone toll service.

Exchange Access Signaling

The signaling system that is used by equal access end offices, to transmit originating information and address digits to the customer's premises, and verify receipt of these address digits. Features of this system include overlap out pulsing, identification of the type of call, identification of the ten-digit telephone number of the calling party, and acknowledgment with supervisory signals.

Exchange Service

All basic access line services, or any other services offered to end users which provide end users with a telephonic connection to, and a unique telephone number address on, the Public Switched Telephone Network (PSTN), and which enable such end users to place or receive calls to all other stations on the PSTN.

Expanded Interconnection Service (EIS)

A service that provides interconnecting carriers with the capability to terminate basic fiber optic transmission facilities, including optical terminating equipment and multiplexers, at Verizon's wire centers and access tandems and interconnect those facilities with the facilities of Verizon.

Extended Area Service (EAS)

Refers to a larger than normal local telephone calling area, under specialized payment plans.

Extended Superframe (ESF)

A type of DS1 framing format that uses a framing bit of twenty-four consecutive frames to provide a 2 kilobits per second framing pattern sequence, a 4 kilobits per second data link, and a 2 kilobits per second cyclic redundancy check channel.

Exterior Gateway Protocol (EGP)

The TCP/IP-based service by which gateways exchange information about which systems they can reach. Generally, an exterior gateway protocol is any internetworking protocol for passing routing information between autonomous systems.

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