电信专业英英词典B-2（在线收听）

　　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.