电信专业英英词典C-1（在线收听）

　　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.