电信专业英英词典B-2_电脑电信

　bit - this is a contraction of the term binary digit, and it is a number in base 2, which means that it can only be a 0 or a 1.

　bit error rate - the rate of message bits that are in error (an error rate of 106 means that there will be on average one error for every million bits).

　bit rate - this is the speed of a digital transmission and is measured in bits per second.

　bitstream - this is data transmitted in a continuous stream (i.e., there are no breaks between characters).

　blind dial - this is when a modem is instructed to dial a number without waiting for a dial tone (when connecting to a line with no dial tone).

　block - a group of bits transmitted as a single unit.

　block down converter - a device that is analogous in function to an electrical transformer and is used to drop the 3.7 to 4.2 khz signal down to uhf or lower frequencies (i.e, 1 ghz and lower).

　board - this is a system on which you can view or leave messages.

　bps - this stands for bits per second is a transmission rate.

　braces - these are the characters "{" and "}".

　break - this is merely an interruption of some sort.

　broadband - data transmission of greater than 56 kbps (kilo-bytes per second) that can carry multiple signals at once. the larger the bandwidth of a carrier, the greater the amount of information it can carry.

　broadbeam - a single large circular beam, which covers a large geographic area (opposite of the narrow beam produced by more powerful antennas).

　broadcast - the sending of one transmission to multiple users in a defined group, area, or region. see multicast and unicast.

　browse - to read through a list of messages or surf the internet (with a browser, such as netscape or ie).

　buffer - this is the place in memory where the transmitted information is temporarily stored before transmission or after reception.

　bulletin board system - this is an electronic message system, usually ran on a microcomputer.

　busy - when a phone line or service is used being used by someone.

　busy signal - the sound that signifies that a phone line or service is in use (i.e., busy).

　byte - 8 bits.