【正文】 puting centers to reduce space requirements for application servers and lower costs. Blink Control Controls the display segment blink rate. BLM Ball limiting metal Bluetooth A technology that allows voice and data connections between a wide range of mobile and stationary devices through shortrange digital twoway radio. For instance, it specifies how mobile phones, Wireless Information Devices (WIDs), puters and PDAs interconnect with each other, with puters, and with office or home phones. BLVDS Bus lowvoltage differential signal BOC Bitoriented code Boost Converter A power supply that steps an input voltage up (boosts it) to a higher, regulated voltage. Bootstrap Often refers to using the output of a stepup converter to drive the main power FET switch, providing more gate drive than the input can supply alone. Also refers to using a switched capacitor to boost the voltage of a node. BPON Broadband passive optical work BPSK Binary phaseshift keying BRD Bandrate divisor BreakBeforeMake BreakBeforeMake: A switch that is configured to break (open) the first set of contacts before engaging (closing) the new contacts. This prevents the momentary connection of the old and new signal paths. Applies to mechanical systems (. that use relays or manual switches) and to solidstate analog multiplexers and switches. BRI Bitrate interface Bridge Battery A battery intended to provide power to system memory while the main battery is replaced. BridgeTied Load Used in audio applications, the load (a speaker in this case) is connected between two audio amplifier outputs (it bridges the two output terminals). This can double the voltage swing at the speaker, pared to a speaker that is connected to ground. The groundtied speaker can have a swing from zero to the amplifier39。 brightness is how it is perceived by the human eye. Broadband A transmission medium with enough bandwidth to carry multiple voice, video, or data channels simultaneously. This technique is used, for example, to provide fifty CATV channels on one coaxial cable。 or to add DSL to a voicegrade telephone line. A mon technique is frequencydivision. Each channel is modulated to a different frequency band and bined in the transmission medium. It is demodulated to its original frequency at the receiving end. Channels are separated by guardbands (empty spaces) to ensure that each channel will not interfere with its neighboring channels. Brownout A condition where the voltage supplied to the system falls below the specified operating range, but above 0V. BSC BSC (Basic Spacing between Centers) is a term that appears on IC package drawings in reference to dimensions between pins. Basic spacing is nominal and can change with conditions. For example, the distance between the rows of pins on a DIP (dual inline package) is BSC because it changes when the auto insertion machine grabs the part, and again when the part is inserted. The BSC dimension, in this case, is the dimension of the hole spacing that the part will fit into, rather than the dimensions of the part itself. BSLF Beststraightline fit BT Butterworth (filter) BTS Base Transceiver Station: The stationary ponent of a cellphone system includes transmitreceive units and one or more antennae. The bined systems (often including multiple colocated systems and ganged directional antennae) is called a cellsite, a base station, or a base transceiver station (BTS). Buck A buck or stepdown switchmode voltage regulator is one in which the output voltage is lower than its input voltage. Note: A customer asked the origin of the term and no one seems to know! A buck regulator is a stepdown regulator, as opposed to boost. We think it39。s circuit board or backplane. Memory, processor, and I/O devices may all share the bus to send data from one to another. A bus acts as a shared highway and is in lieu of the many devoted connections it would take to hook every device to every other device. Often misspelled buss. BWLS Bandwidth, Large Signal BWSS Bandwidth, Small Signal C 1. Capacitance, capacitor。 used with RAS and a rowaddress to select a bit within the DRAM CAT3 Category 3: Refers to Ether cabling that satisfies the criteria for the EIA/TIA568 standard39。s Category 5, which allows data transfers up to 100Mbps. CATV Originally Community Antenna Television, a term which now refers to any munity television system distributed by cable. CBR Constant bit rate CC/CV Charger Constant Current/Constant Voltage battery charger CCCv Constant current/constant voltage CCD Charge Coupled Device: One of the two main types of image sensors used in digital cameras. When a picture is taken, the CCD is struck by light ing through the camera39。 crossconnect module CDC Clock distribution circuit CDD Clock Distribution Device or Clock Distribution Driver CDMA Code Division Multiple Access: A digital cellular technology that uses spreadspectrum techniques. Unlike GSM and other peting systems that use TDMA, CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spectrum. Individual conversations are encoded with a pseudorandom digital sequence. CDR Clock/data recovery CE Control Chip enable control CH Chebyshev (filter) Ch. to Ch. Skew (Ps Max) Channeltochannel skew. A signal on one channel has a different phase than the same signal on another channel (delayed/skewed). This is measured in picoseconds, max. Channel Associated Signaling Channel Associated Signaling (CAS): Some munications protocols include signaling functions along with data. Channel Associated Signaling protocols include signaling in the data channel (as opposed to a dedicated signaling channel). Also called Robbed Bit Signaling. Chans. Channels Charge Injection A