电信专业英英词典E-3（在线收听）

　　补充：

　　E-1 - The European equivalent of a T-1.

　　E911 Taxes/Surcharges - This tax is set and imposed by local governments to help pay for the cost of an emergency response communications system that identifies both the caller and the location of the call.

　　EAS - Extended Area Service. Customers usually pay a larger flat rate to increase their local calling area if an area gets EAS. It can decrease a customer's monthly bill if the customer makes a certain number of calls to the expanded area.

　　E-mail - Electronic mail - A system that allows the sending and receiving of messages through a computer.

　　E-mail Address - A computer mailing address to which electronic mail is sent.

　　Encryption - A way of making transmitted data, such as e-mails, unreadable to everyone except the receiver. If the data is intercepted by anyone as it travels over a network, it cannot be read. Only those persons that have the right type of decoding software can unscramble the message. Encryption is used to protect e-commerce and financial transactions such as those on TDS ePay.

　　Ethernet - A network link that can transmit approximately 10,000,000 bits per second.

　　Exchange - A geographic area established by a telephone company for specifying the local telephone service area.

　　E&M Leads Signaling

　　E&M Leads Signaling is an interface, used for connections between switches and transmission systems and between transmission systems themselves. Signaling information is transferred across the interface via 2-state voltage conditions on two leads, each with a ground return, separate from the leads used for message information. The message and signaling information are combined and separated by means appropriate to the transmission facility.

　　E-mail electronic mail

　　electronic mail

　　ECSA

　　Exchange Carriers Standards Assoc

　　EKTS

　　electronic key telephone system

　　Electrical Signal

　　An electrical signal is a signal consisting of an electrical current (i.e., a flow of electrons) that varies with time or space in accordance with specified parameters.

　　Electronic Mail

　　Electronic mail is a generic term for non-interactive communication of text, data, image or voice messages between a sender and designated recipients using telecommunications.

　　Electronic Switched Network (ESN) Service

　　ESN service is a private network service that provides user organizations with a uniform numbering plan and numerous call-routing features. The electronic tandem switching functions are furnished by either PBX or Centrex switching equipment.