, with 64-QAM, there are 6 bits per baud, resulting in higher-speed transmissions. Baudot code A data code that uses a 5-bit structure and was used on vintage teleprinters (e.g., Telex). BcN (Broadband Convergence Network) An ETRI initiative designed to provide Inter- net access at speeds of 50Mbps to 100Mbps, about 50 times faster than current conventional ser- vices, with nationwide Korean coverage. beacon frame A frame sent by a token-ring adapter indicating that it has detected a serious problem. An adapter sending such frames is said to be beaconing. BECN (backward explicit congestion notification) A bit field in a Frame Relay header that the network uses to inform the transmitter of network congestion and the need to initiate a congestion avoidance procedure. BER (bit error rate) In data communications testing, the ratio between the total number of bits transmitted in a given message and the number of bits in that message received in error. The BER is a measure of the quality of a data transmission, usually expressed as number as a power of 10 (e.g., 1 bit error in 105 bits transmitted, or 1 in 100,000). best-effort QoS QoS that is not guaranteed but is as good as possible under the circumstances. beta test The stage at which a new product is tested under actual usage conditions. Beyond 3G An enhancement to 3G that involves today's 3G technologies but supports band- widths greater than 5MHz and adds smarter and more efficient IP-based back-end infrastructure and additional one-way or two-way airlinks to provide further capabilities. Also referred to as Super 3G and Ultra 3G. BFWA (broadband fixed wireless access) A wireless broadband technology that offers high capacity. There are two categories of BFWA standards: high-frequency BFWA (which is focused on broadband services, including real-time video, streaming video, and video transfer and operates on frequencies above 25GHz) and low-frequency BFWA (which is used mainly for data communications and operates on frequencies between 2GHz and 11GHz). BGP (Border