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the wizards. To change general properties for IPSec L2L connections, go to Configuration | Site-to-Site VPN tab | Network (Client) Access | Advanced. From here, you can edit the crypto maps, IKE Phase 1 policies, IKE parameters (like NAT-T), Phase 2 transform sets, crypto ACLs, and so on.
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costly than smaller optical components. Some of the benefits of the large transmit beam may not be of any significance for the particular application being considered. For example, for short-range links, the effect of scintillation is insignificant. Transmit Beam Divergence Transmit beam divergence measures the degree of beam spreading as it propagates away from the transmitter. Divergence is the property, measured in degrees or radian, that identifies the spreading factor of the transmit beam. The smaller the divergence, the less spread out the beam is. In any wireless communication system, such spreading of the signal is one of the greatest sources of signal loss. To illustrate the point, consider Figure 9.2 where two FSO systems are located a half mile from each other. Let s assume the transmit beam divergence is about 1 degree, a typical value for an FSO system. By the time the signal arrives at the location of the receiver, the transmit beam would have spread enough to create a beam 46 ft in radius. Unless a receiver with a diameter of 46 ft is used to collect all the light, an impractical proposition, any practically sized receiver would not be able to collect most of the signal. In fact, in the case of this example, a typical FSO system with a 6-in diameter receiver would be able to collect only about 1/10000th of the total power arriving at the receiving end. Significantly reducing divergence requires higher precision optics and a higher precision manufacturing process. For example, to recover 1/10th the transmitted signal by a 6-in receiver at a distance of 0.5 miles from a transmitter, the transmitted beam needs to have a divergence of about 0.034 degrees. Such a system requires much more precise components and manufacturing processes than a system with 1 degree of divergence. Though technically feasible, the cost of such high precision systems may not make them economically viable in all applications. Systems with a narrower beam divergence also pose a significant challenge to the task of aligning FSO links and maintaining alignment during their operation. For example, for the system with 0.035 degrees divergence, a deflection of the transmit beam by as little as 0.035 degrees can mispoint the transmit signal away from the receiver. As explained later, such mispointing is quite common, but mechanisms to maintain alignment within such small angles, though technically feasible, can be very costly. Receive Optics The receiver optics serve purposes exactly complementary to those of the transmit optics. The receiver optics collect the light signal and focus it onto the detector (or into the fiber-optic cable in the case of a passive system). They are made out of combination of one or more lenses and/or mirrors. From all perspectives, the receive optics in FSO systems serve the same purpose as antennas do in RF wireless systems they collect the signal. The receive optics are characterized by two key parameters: the receive aperture and the field of view (FoV). A simple form of receive optics is illustrated in Figure 9.3. Receive Aperture Receive aperture is the diameter of the receiver through which the received signal is collected. It is, therefore, a key factor in determining the amount of light collected by the receiver. A receiver with twice the receive aperture can collect
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Sample When you look at the following SOAP example, you can see how it is based on
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for call setup and signaling between the two terminals (this is defined in the H.225 and H.235 standards). This connection, called the signaling connection, is used to negotiate the setting up of the multimedia connections between the two terminals. The Q.931 ITU-T standard is used to implement the signaling of setting up and tearing down connections on this connection (also used by ISDN). On the signaling connection the two parties will negotiate the port numbers to use for the second TCP connection. The called party (destination terminal) will initiate a second TCP connection back to the source. Both of the port numbers for this connection are dynamically chosen above 1023 by both parties. This connection is called the call control connection, and its mechanics are defined in H.245. This connection handles the multimedia connections that will be established, including which audio and video compressor-decompressors (CODECs) will be used. Up to three UDP connections will be established from the source terminal to the destination, assuming that this is a video-conference call: Audio using RTP Video using RTP Control using RTCP
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Using the fact that the Laplace transform of eat is 1/(s a), we conclude that the inverse Laplace transform of this expression is 1 t 7 2t e e + 5e4t 3 3 EXAMPLE 13-9 Find the inverse Laplace transform of s 4 (s + 2)(s 2 + 4) SOLUTION Since there is a quadratic in the denominator, we write our partial fraction expansion as F(s) = s 4 A Bs + C = + 2 2 + 4) (s + 2)(s s+2 s +4 (13.7)
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When dealing with VLANs, switches support two types of switch ports: access-links and trunks. When setting up your switches, you will need to know what type of connection an interface should use and configure it appropriately. As you will see, the configuration process for each type of interface is different. This section discusses the two types of connections.
CREATE TABLE Customer ( CustNo CHAR(8), VARCHAR2(20) CONSTRAINT CustFirstNameRequired NOT NULL, CustFirstName VARCHAR2(30) CONSTRAINT CustLastNameRequired NOT NULL, CustLastName CustStreet VARCHAR2(50), CustCity VARCHAR2(30), CHAR(2), CustState CustZip CHAR(10), CustBal DECIMAL(12,2) DEFAULT 0, CONSTRAINT PKCustomer PRIMARY KEY (CustNo) )
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A cam is an element of the cam-follower mechanical system that compels the movement of the follower by direct contact. The motion of the follower is the result of a program. Just as a computer is programmed, so is a cam. Thus, the system can be thought of as a mechanical information device. Accordingly, the goal of the designers is to build a program, establish the locus of the contact points between the cam and follower, produce the cam pro le coordinates system, and fabricate the cam within an acceptable accuracy. After all the parts are assembled the performance of the cam-follower system is observed. No one is sure where and how cams got their start. The Sanskrit (Indo-Iranian) term Jambha ( cog, peg, or tooth ) may indicate the geographic area in which they had their beginnings, and so may the Teutonic Kambr (toothed instrument), which refers to cam mechanisms that have their origin in the wedge (a linear cam) and have been found in Paleolithic Age relics of about 10,000 years ago. The later construction of the great pyramids of Egypt also involved the use of the wedge. However, it was the genius of Leonardo da Vinci that produced a modern design cam applied to a machine for pumping water. Cam-follower mechanisms are found in almost all mechanical devices and machines (i.e., agriculture, transportation equipment, textiles, packaging, machine tools, printing presses, automobile internal combustion engines, food processing machines, switches, ejection molds, and control systems, and more recently in micromachines such as microelectromechanical systems [MEMS]). Figure 1.1 shows an automobile cam-driven overhead valve train linkage. More recently, computer resources, known as CAD/CAM for cams, offer signi cant simpli cation in the design and fabrication of assembled cam and follower systems. CAD/CAM refers to computer-aided design and computer-aided manufacturing. Graphic workstations enable the design engineer to optimize the motion and geometry of a cam mechanism and also to incorporate the kinematic and dynamic performance requirements necessary over the entire range of operating speeds. In the manufacturing proccess, networked numerically controlled (NC) machines receive digitized geometric data from a CAD system. The downloaded le of cam coordinate data is forwarded directly to the machine tool controller, which eliminates the potential human error inherent in older techniques of manufacturing. The accuracy of the cam produced is frequently improved, and the costs are lowered.
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a given type of traffic can have monetary implications. For example, it is common to pay for a long-distance phone call (on a per-call basis). One cannot be expected to pay for a phone call if the call does not receive the necessary network resources to ensure high quality. Other services might not have such monetary implications and might be offered on a best-effort basis. Such a situation creates an incentive for certain applications (or individuals) to steal better service without paying for it. Therefore, we need authentication functions to identify users and ensure that a given user is who he or she claims to be. Furthermore, a given user may be entitled to a given level of QoS under certain circumstances but not under other circumstances. Finally, the Internet has already seen denial of service (DoS) attacks, in which certain systems (or persons) flood the network with traffic, causing congestion and service failure for everyone else. Therefore, certain rules must be established to specify which circumstances lead to which actions, and there must be methods for ensuring that those rules are applied. This can be considered as a type of policing function. Appropriately, the IETF has developed a protocol known as the Common Open Policy Service protocol (COPS), which RFC 2748 specifies. COPS is a client-server protocol, as depicted in Figure 8-2. A Policy Enforcement Point (PEP), such as a router that needs to enforce certain rules, queries a Policy Decision Point (PDP) that makes the actual policy decisions. The PEP can be considered the policeman and the PDP can be considered the judge. Given these analogies, the acronym COPS is particularly fitting.
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