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Even though active/active is supported on the PIXs using the serial cable, this part of the chapter will only discuss the use of LBF. Some of the steps are the same as or similar to the steps performed when configuring active/standby.

nucleating protein will have on the freezing temperature of water. Record your hypothesis on page 98.

source and destination. This resulted in the development of the layered line structure shown in Figure 6.4. Note that this structure enables the subdivision of the transmission path into distinct entities, thus facilitating SONET operation, administration, maintenance, and provisioning, a set of conditions referred to by the acronym OAM&P. Through this subdivision it becomes easier to refer to a portion of a path instead of a complete path, which facilitates such operations as performance measurements, testing, and troubleshooting on a segment basis. This, in turn, can expedite the isolation of problems to a specific area. In examining Figure 6.4, note that the lowest layer of SONET is a section. A section in the SONET context represents a transmission path between two repeaters or other locations where the optical signal is transmitted and received. At the next-higher layer the line represents a , unit of SONET transmission capacity in terms of a Synchronous Transport Signal (STS), whose operating rates we will examine shortly. At the top of the line hierarchy is the path, which represents the end-to-end transmission of an STS payload by SONET. As we will note when we examine the composition of the STS frame format, a mechanism was created within frames to enable various OAM&P functions to be performed, such as providing a voice channel to be used by technicians.

Some possible application areas for functional testing include manufacturing final checkout, incoming inspection of mobiles for service providers, or repair verification in service shops. Examples of these functional tests include placing a phone call to

3. 4.

13. Tune the snap circuit. Since the diode s output is a comb of frequencies, a spectrum analyzer is utilized to tune the SRD for maximum power output at the desired harmonic. Insert the proper frequency and power ( 17 to 23 dBm) at the SRD circuit s input. Adjust CM (input match), R1 (diode bias), and CR (line filter) until the desired output frequency is at maximum power, while confirming that all subharmonics and harmonics are properly attenuated. This is one of the easier frequency multipliers to design for operation up to 600 MHz output, as presented by Wenzel. L1 and C1 form the input matching network, while blocking harmonics from entering the input of the multiplier, as well as increasing the input voltage to the diode (caused by this high-Q matching circuit transforming the impedance and the voltage). D1 and D2 are the nonlinear harmonic-generating devices. L4 is the DC ground for the diodes, with the DC being created by rectification of the AC of the input by D1. L2, C2, L3, and C3 shunt the undesired frequencies to ground, while passing only the frequency of interest and matching the output (as with most multipliers, the diode switching times will be degraded unless these

Each time through the loop, kbhit( ) is called. If a key has been pressed, then a true value is returned, which causes !kbhit( ) to be false, so the loop stops. However, if no key has been pressed, kbhit( ) returns false, and !kbhit( ) is true, allowing the loop to continue.

As you saw in the previous chapter, you can access a structure directly, or through a pointer to the structure. In like fashion, you can access an object either directly (as has been the case in all preceding examples), or by using a pointer to the object. To access an element of an object when using the actual object itself, use the dot operator. To access a specific element of an object when using a pointer to the object, you must use the arrow operator. (The use of the dot and arrow operators for objects parallels their use for structures and unions.) To declare an object pointer, you use the same declaration syntax that you would use for any other pointer type. The next program creates a simple class called P_example, defines an object of that class, called ob, and defines a pointer to an object of type P_example, called p. It then illustrates how to access ob directly, and how to use a pointer to access it indirectly.