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Clearly, changes will always occur as we demand faster and more reliable communications capabilities It was only a matter of time until some users demanded higher speed communications than was offered by the current DSL technologies As a result, VDSL was introduced to achieve the higher speeds If, in fact, speeds of up to 50 Mbps are demanded, then the distance limitations of the local cable plant will be a factor In order to achieve the speeds, you can expect that a fiber feed will be used to deliver VDSL This technique will most likely carry ATM traffic (cells) as its primary payload The pilot program of US West communications in Gilbert, Arizona plans to deliver fiber to the door, Fiber to the Home (FTTH), to provide voice, data, video, and multimedia communications to the consumer Although this pilot is still in planning, a lot of excitement has been generated over the possibilities Another such pilot was announced in 1998 by S print communications with their Integrated On-demand Networking (ION) capability to satisfy the same communications services from the consumer s door ION will use a combination of VDSL and ATM cells to provide integrated communications on demand Sprint recognized after the announcement of ION that local loop, and particularly the fiber local loop, was a requirement to deliver the service Unfortunately, many of the incumbent telephone companies do not have fiber to the door This will cause delay until such time that the fiber can be deployed Table 16-2 summarizes the speeds and characteristics of the DSL technologies discussed These are the typical installation and operational characteristics; others will certainly exist in variations of installation and implementation Table 16-2: Summary of DSL speeds and operations using current methods Service ADSL Explanation Asymmetric DSL Rate Adaptive DSL Download 15 8192 Mbps 64 Kbps 8192 Mbps Upload 16 640 Kbps Mode of Operation Different up and down speeds, one pair wire Different up and down Many common operations on 768 Kbps One pair wire Now ratified as DSL-lite.

I/O Lines Processor speed, MHz Execution time EEPRPOM Kbytes Multitasking Package, inches Language*

Instead of double-clicking on a bar, the user can also double-click on a member in the legend, which has the same effect as double-clicking on a bar Likewise, the user can double-click on a value along the X axis to drill down on the dimension on the Axis Fields Double-clicking on any of the members shown on the X axis will expand to the subcategory level Sometimes having the PivotTable and PivotChart on the same page is too restrictive due to a lack of screen real estate Fortunately, it s possible to move the PivotChart to another spreadsheet while leaving it linked to the same PivotTable Simply right-clicking on a blank area of the chart shows an option on the menu labeled Move Chart Selecting this item opens a Move Chart dialog box and allows the user to move the PivotChart elsewhere on the same worksheet or to a new worksheet Moving to a new spreadsheet works well and the PivotChart and PivotTable remain linked; a change in one will be reflected in the other

Table 16-2: Summary of DSL speeds and operations using current methods Service Explanation Download Upload Mode of Operation (Glite) No splitters One pair wire HDSL High-data rate DSL 1544 Mbps in North America 2048 Mbps in rest of world 144 Kbps (64+64+16) as BRI 1544 Mbps 2048 Mbps 1544 Mbps 2048 Mbps Symmetrical services Two pairs of wire Symmetrical operation One pair of wire ISDN BRI

31 20

1544 Mbps 2 Uses only 1 pair, 048 Mbps but typically provisioned at 768 Kbps One pair wire 15 60 Mbps Fiber needed and ATM probably used

25 40

Summary

Why all the hype Well the local providers are extremely excited if they can install higher-speed communications and preserve their local cable plant No one wants to abandon the local copper loop, but getting more data reliably across the local loop is imperative Therefore, the ability to breathe new life into the cable plant is an extension of the facilities in place The consumer is looking for higher speed access (primarily to access the Internet) for whatever the application Yet, at the same time, consumers are looking for a bargain They do not want to spend a lot of money on their communications services The providers are trying to bump up their revenues without major new investments They would like to launch as many new service offerings on their existing cable plant and increase the costs to the end user This is a business decision, not a means of trying to rake the consumer over the coals Yet, there has to be a happy medium of providing services and generating revenues with limits on expenses To do this, the xDSL family offers the opportunity to meet the demands while holding down investment costs The key ingredient for success is to minimize costs and satisfy the consumer Make no mistake, if the local provider does not offer the high-speed services, someone else will

12-1