（单词翻译:单击）
Bit - This is a contraction1 of the term Binary2 digIT3, 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 modem4 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 analogous5 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.
Braces6 - 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 geographic7 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.
Browse8 - To read through a list of messages or surf the internet (with a browser9, such as Netscape or IE).
Buffer10 - 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 microcomputer11.
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.
