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At that point, scanning line or triad visibility is interfering with the viewer s ability to see all of the detail in the picture (sort of not being able to see the forest for the trees) The finer the triad or scanning structure, the closer to the screen this point can be (in picture heights) Therefore, high-definition screens allow either closer viewing for the same size screen or larger screens for the same physical viewing distance (not in picture heights) Recent research indicates that subjective quality is not strictly a function of viewing angle Viewers appreciate large screens even if they are so far from them that they cannot perceive all of their resolution When the effects of scanning lines and triads are reduced, other artifacts (such as a temporal alias of panning called strobing) may become more obvious From far enough away, it is impossible to tell high-definition resolution from NTSC resolution Visible Scanning Lines Normally considered a defect that affects perception of fine vertical detail Scanning line visibility can also have an apparent sharpness increasing effect, however See also Sharpness and Viewing Distance Visible Subcarrier The most basic form of cross-luminance Visual Acuity The amount of detail perceptible by the human visual system It depends on many factors, including brightness, color, orientation, and contrast Optimum viewing distance depends on visual acuity Walled Garden A term that appeared in the mid- to late90s to define interactive content offerings contained or walled-off from direct access to Internet users Walled garden users may link to the Internet from walled gardens, but not vice versa America Online is an example of a very successful walled garden Certain interactive TV middleware software solutions enable cable and satellite providers to create their own walled gardens or portals Inside an ITV walled garden an interface allows the viewer to have access to news, sports information, email on TV, and other applications.

Figure 912 shows an ADSL modem installed at a customer's site The local loop connects to a splitter which separates voice and data communications The ADSL

Note that the splitter needs to be installed at the customer's premises, normally by a technician from the telephone company The voice line can use the existing telephone wiring in the house, but the data line needs to be installed by a professional All this makes the ADSL line expensive We will see that there is an alternative technology, Universal ADSL (or ADSL Lite)

At the telephone company site, the situation is different Instead of an ADSL modem, a device called a digital subscriber line access multiplexer (DSLAM) is installed that functions similarly In addition, it packetizes the data to be sent to the Internet (ISP server) Figure 913 shows the configuration

Figure 16-18

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The installation of splitters at the border of the premises and the new wiring for the data line can be expensive and impractical enough to dissuade most subscribers A new version of ADSL technology called ADSL Lite (or Universal ADSL or splitterless ADSL) is available for these subscribers This technology allows an ASDL Lite modem to be plugged directly into a telephone jack and connected to the computer The splitting is done at the telephone company ADSL Lite uses 256 DMT carriers with 8-bit modulation

The data link layer transforms the physical layer, a raw transmission facility, to a reliable link It makes the physical layer appear error-free to the upper layer (network layer) Figure 26 shows the relationship of the data link layer to the network and physicallayers

Other responsibilities of the data link layer include the following: [I Framing The data link layer divides the stream of bits received from the network layer into manageable data units called frames Physical addressing If frames are to be distributed to different systems on the network, the data link layer adds a header to the frame to define the sender and/or receiver of the frame If the frame is intended for a system outside the sender's network, the receiver address is the address of the device that connects the network to the next one D Flow control If the rate at which the data are absorbed by the receiver is less than the rate at which data are produced in the sender, the data link layer imposes a flow control mechanism to avoid overwhelming the receiver o Error control The data link layer adds reliability to the physical layer by adding mechanisms to detect and retransmit damaged or lost frames It also uses a mechanism to recognize duplicate frames Error control is normally achieved through a trailer added to the end of the frame D Access control When two or more devices are connected to the same link, data link layer protocols are necessary to determine which device has control over the link at any given time Figure 27 illustrates hop-to-hop (node-to-node) delivery by the data link layer

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