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As the table indicates, the outcome of an XOR is true only if exactly one of the operands is true; it is false otherwise. Bitwise operations most often find application in device drivers, such as modem programs, disk file routines, and printer routines, because the bitwise operations can be used to mask off certain bits, such as parity. (The parity bit is used to confirm that the rest of the bits in the byte are unchanged. It is usually the high-order bit in each byte.) The bitwise AND is most commonly used to turn bits off. That is, any bit that is 0 in either operand causes the corresponding bit in the outcome to be set to 0. For example, the following function reads a character from the modem port using the function read_modem( ) and resets the parity bit to 0: Testing in the Life Cycle of a Network 78 Network Test and Measurement
Amplifier Design
then a corresponding sum in the other direction also will be wrong. The intersection of the incorrect row and incorrect column pinpoints the guilty number and, in fact, by knowing what the sums are supposed to be, the original number can be restored. The error correction scheme used by DVD and BD is a bit more complicated than this but operates on the same general principle. It is always possible that so much of the data is corrupted that error correction fails. In this case, the player must try reading the section of the disc again. In the very worst cases, such as, an extremely damaged disc, the player will be unable to read the data correctly after multiple attempts. At this point, a movie player will continue on to the next section of the disc, causing a brief glitch in playback. A DVD-ROM or a BD-ROM drive, on the other hand, cannot do this. Computers will not tolerate missing or incorrect data, so the -ROM drive must signal the computer that an error has occurred so that the computer can request that the drive either try again or give up. 1: After a call to Seek( ), the next read or write operation will occur at the new file position. The new position is returned. If an error occurs while seeking, an IOException is thrown. If the underlying stream does not support position requests, a NotSupportedException is thrown. Other exceptions are possible. Here is an example that demonstrates random access I/O. It writes the uppercase alphabet to a file and then reads it back in nonsequential order. Hydroxyl group Found at the active site of enzymes Aids in glycoprotein formation
Figure 11-3 As single-chain phospholipid is added to an aqueous solution, the concentration of free phospholipid increases, until the critical micelle concentration is reached. above the cMc, micelle formation is highly cooperative, and additional lipid added to the solution increases the micelle concentration. some residual energy is also created. The residual energy is absorbed in an optical fiber as vibrational energy that results in gain or amplification of the signal to be amplified. The key to Raman amplification capability is the launching of pump light into a fiber at amplifier sites opposite the signal direction. This action results in Raman amplification functioning as a low-noise preamplifier that maintains signal integrity. In addition, because the signal power is weaker at the output end of a fiber, no additional nonlinear fiber phenomena are introduced. Another advantage associated with Raman amplification is the fact that an existing optical fiber can be used as a medium when properly pumped. This means that amplification is not dependent on doping of the fiber and permits the use of a wider range of existing fiber. SIGNAL SWITCHING Another evolving optical area that warrants attention concerns signal switching. Today the switching of an optical signal is primarily an all-or-nothing affair. That is, if Joe Backhoe digs where he shouldn t and breaks a SONET ring, within a few milliseconds the break will be detected and the full optical flow will commence in an opposite direction to provide a restored communications capability. To be truly effective requires a higher level of optical switching. For example, assume that a DWDM fiber is routed from Boston to Washington, DC through New Y ork and Philadelphia. Instead of using opticalto-electrical converters at each city to feed an electronic switch, a far simpler mechanism and obviously less expensive one would be to drop wavelengths at the intermediate locations. While some equipment permits communications carriers to drop a wavelength, most carriers would like the ability to both drop and add wavelengths at intermediate locations. The key to obtaining this capability is a true optical switch, which would direct signals from any input port to any output port as illustrated in Figure 6.3. Optical cross-connections currently occur using digital electronics, requiring the incoming optical signals to be converted into electrical pulses. One emerging type of optical switch being developed consists of arrays of miniature mirrors that move back and forth to redirect light. This type of system is referred to as a microelectromechanical system (MEMS). A relatively recent MEMS development includes the etching of planar arrays of tiny components to form silicon substrates. Through the etching process mirror elements become suspended on tiny posts Fast convergence Loop-free topology Variable Length Subnet Masking (VLSM) and route summarization Multicast and incremental updates Multiple routed protocols 0 0 1 0
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