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Generating QR-Code in c sharp STEP 2. Determine Your Test Readiness

If voice and data applications are to be mixed in a single network, attention must be paid to the QoS of the voice application. Data, which usually ride on TCP, respond gracefully to transient congestion. TCP ensures the reliable delivery of data; if packets are dropped, TCP retransmits them. TCP responds to congestion by backing off the rate it sends. At an aggregate level, this keeps the traffic in the network within reasonable bounds for data applications. Voice is severely impacted by network congestion. Excessive delays cannot be tolerated. A packet containing voice cannot be played if it is received late. If packets are lost, retransmission is not an option because they will very likely arrive too late. A quality voice service demands low delay and low loss. There are three elements in achieving QoS. First the network resources must be committed to the voice application. Second the traffic must be marked, so that at each point of congestion, the committed resources can be applied to the guaranteed flow. Third the amount of marked traffic must be kept at or below the amount of bandwidth committed to the flow. When network resources are committed to the voice application, it has to be done on an accounting basis, link by link. MPLS traffic engineering (TE) provides the means of achieving this. Traffic engineering uses RSVP to reserve resources for the voice flows. For example, if the shortest path (that is, the normal IP route) has too few resources, traffic engineering can use an explicit route to send the flow on a less congested path. The MPLS label information provides a means of marking the traffic. As RSVP sets up an MPLS traffic-engineering tunnel, it also assigns the labels to be used by the flow. These labels plus the EXP bits (QoS-specific bits that are carried along in the label information) provide a simple and, and in many proponents view, a scalable way of identifying the voice flows. (This is the diffserv approach discussed in 3.3 An intserv approach is also available.) The traffic-engineering tunnels can be employed like voice tie lines.4 Consider a tunnel between two voice gateways. The tunnel can be sized to the expected number of calls. As calls arrive that are destined to the remote gateway, they are routed over the tunnel by applying the appropriate MPLS
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personnel is important. Adding to the complexity of the scenario is the workforce agility element. Being able to collaborate in real time as the newer worker gains experience is essential for scaling both the experienced person and the new hire. Smart handheld devices, such as Motion Computing s C5 medical tablet, which incorporates imaging, radio-frequency identification (RFID), and 802.11 connectivity, enable physicians and medical technicians in remote locations to monitor and assist in patient point-of-care scenarios. Not only do devices like the C5 allow for barcode reading (shown in the next illustration) and patient ailment photography, but they also offer high-resolution video abilities, handwriting recognition, and voice technology. The voice technology is a tremendous staff multiplier, because it allows the care professional to discuss patient conditions and treatments to a single remote support person or to a conference room with support staff, greatly increasing patient safety, treatment outcome, and reduction in healthcare operating expenses.
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WAP v. 1.0 released FCC begins PCS auctions; PHS launched in Japan; GSM 1900 MHz spec released
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In This Part
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The underlying operating system for Microsoft Windows Small Business Server 2003 is Microsoft Windows Server 2003, the latest version of Microsoft s mission-critical enterprise operating system and an appropriate choice for a small business suite of server products. Your business might be small compared with, say, Microsoft, but that doesn t make it any less mission critical to you and your employees. In this chapter, we provide some general information about servers, clients, and networks to give you the background you ll need for later chapters.
Do not use your PowerPoints as an outline of what you want to say; use them as a series of visuals to support your main points. Again, your presentation should transcend your outline and the things you intend to say. Your presentation is not just about getting your points across for the sake of compliance; it is for your attendees, and it is supposed to ensure that your ideas are 100 percent clear to them. What will help to ensure
The security requirements of CDPD are similar to those of a wireless voice network. Data encryption over the air and the ability to prevent fraud and the cloning of CDPD devices are absolutely required. Because of CDPD s slow throughput, security solutions must also provide superior performance. Because CDPD does not use a tamper-resistant hardware module like the GSM Subscriber Identity Module (SIM) card, the CDPD authentication and encryption process resembles the Code Division Multiple Access (CDMA) architecture. CDPD devices are programmed at the time of manufacture with a unique numeric value called the Network Entity Identifier (NEI). The value is stored in the memory of the CDPD device and is used to authenticate the device on the CDPD network. However, the CDPD security architecture differs from a voice network in one significant manner. Whereas as a voice network utilizes a challenge response protocol over an unencrypted channel, CDPD establishes an encrypted channel first before progressing with authentication. How do two unknown entities establish an encrypted channel without first authenticating This authentication is based on a widely used security protocol called the Diffie-Hellman key exchange. Named for two well-known Stanford University cryptographers, Martin Hellman and Whitfield Diffie, this protocol was one of the first public uses of asymmetric cryptography. DiffieHellman is not a mechanism that encrypts data, but is a mechanism that
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