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When Frame Relay was developed, the important part of the data-carrying capacity was the use of the frame to carry the traffic and not have the same overhead as an older technology (such as X.25). The frame was filled with data as necessary, but it handled the speed and throughput via the high-speed communications and lower overhead. In Figure 10-4 , the frame is shown. The frame is an HDLC-framed format, as shown in this figure. The beginning of the frame (as with most HDLC formats) starts with an opening flag. Next, a two-byte sequence defines the addressing of the frame. This is called the Data Link Connection Identifier (DLCI). By very nature of the title (DLCI), we can assume that Frame Relay works at the data link layer. The DLCI is comprised of several pieces of information, shown later, but is normally a two-byte sequence. Provisions have been made to enable the DLCI to expand to up to four bytes, but very few implementations occur using more than the two-byte address. Following the DLCI is the information field. This is a variable length field. The initial standard allowed for a variable amount of data is up to 1,610 bytes. This is sufficient for most installations, but change always occurs when things are stable. The reason for the 1,610-byte field is to handle a frame from a LAN using a full frame of Ethernet traffic.

14.14 TWO INDEPENDENT CAMS IN SERIES (AUTOMOTIVE)

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CHAPTER 28:

9, unit prices should never be summed. If anything, they can be averaged or recalculated with revenue/quantity sold. If you wish to see another example of a fan trap, disable the option Multiple SQL Statements For Each Measure and include the two measures from two different tables, such as Store Details \ Extended sales floor size and Sales revenue. These measures must contain aggregate functions such as SUM or COUNT.

perfect because of the paper flaps on the image of the present certain areas of the pattern need to be hidden but this is fine work for the moment. After you read 23 on PowerClips, you ll be able to hide the areas outside of the present s flaps. This finished pre-visualization provides you and your client with a view of the goods you ve designed, as they will appear from the customer s point of view, and perhaps this is the best perspective effect of all, as shown here.

Session Initiation Protocol (SIP) The network protocol used to set up and tear down Voice over IP (VoIP) and other communications connections. See also Voice over IP (VoIP).

All the life cycle phases also require general-purpose test equipment such as oscilloscopes, voltmeters, spectrum analyzers, logic analyzers, etc. General-purpose test equipment applies to several types of electronic equipment, including communications network equipment. This handbook covers special-purpose test equipment only; for similar treatment on general-purpose test equipment, see Electronic Instrument Handbook, Second Edition, by Clyde F. Coombs, Jr. (McGraw-Hill, 1995). 4.2 Development Phase Test and Measurement Development of communications products is complicated by three factors: 1. The fast pace of technology: Design to perform. 2. The demands of national and international standards: Design to conform. 3. The organic nature of communications networks: Design to interoperate. The fast pace of technology is a double-edged sword. While new and better technologies enable higher performance in new products, they also render last year s products obsolete. The communications product designer must stay abreast of new technologies and understand how these can be used to enhance product performance for competitive advantage. The first imperative for a communications equipment designer is to design to perform perform better than the competitive product, at a lower price. While standards continue to be a long-term stabilizing factor in communications, the short-term situation for new technologies can be rather competitive as different factions promote their ideas in standards bodies, or others attempt an end run, hoping to establish a de facto standard. Often the designer is working ahead of the final version of the standard and must decide which of perhaps several competing approaches will win the day. In the end, the design must conform to whatever standard wins in the competitive marketplace. Design to conform, yes, but conform to which standard The organic nature of communications networks means that they are constantly evolving. The new product must work in the old network while driving its evolution to become the more capable network of tomorrow. Designing to interoperate demands interoperation with all the old network equipment, as well as the new generation from other developers designing to the same standard. This section reviews how test and measurement equipment enables the three imperatives: design to perform, design to conform, and design to interoperate.