电信专业英英词典C-1_电脑电信

　cache - generally, a place to temporarily store something. regarding computers and telecommunications, it is a place where data is temporarily stored during transmission.

　call - this is a connection between two or more users with the intent of exchanging information.

　call back - this is a security method with which a user calls into a system and requests to be called back by the system at a particular, predetermined number.

　caller - anyone who makes a call.

　caller id - the service that allows someone being called to see the caller's name and phone number.

　call progress - this is the status of the telephone line. it can be busy, ringing, not ringing, etc.

　call waiting - this is a service that tells you if someone is trying to call you when you are already using the line (i.e., talking with someone else).

　capacitor - this is an electronic device for storing electric charge.

　capture effect - this effect occurs when two signals are received that are the same (or nearly the same) frequency. the stronger signal will appear in the output.

　c-band - the portion of the electromagnetic spectrum allotted for satellite transmission; it is the 4 to 8 ghz frequency transmission range. specifically, the 3.7 to 4.2 ghz band is used as the downlink, and the 5.925 to 6.425 ghz band serves as the uplink.

　card - this term refers to a computer peripheral that can be connected internally (i.e., directly), without any cables, to a computer, such as a modem.

　caret - this is the character "^".

　carrier - this term refers to: (1) a company, such as a local telephone company, that provides circuits dedicated to communication, and (2) an electrical signal capable of being modulated to carry information.

　carrier detect (cd) - this is a light on most modems that signifies, when lit, that the modem is connected.

　carrier frequency - the main frequency on which data, a voice, or video signal is sent. common microwave and satellite communications transmitters operate in the band from one to fourteen ghz.

　carrier signal - the basic radio, television, or telephony center of a frequency transmission signal.