Embedded Systems November 2000 Vol13_12

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Page 65 of 189

= i i = As the bandwidth to the home increases, Internet appliances will begin to proliferate. This in turn will drive the adoption of home networks. ~Gateway-based access model - - · - ,., · " .:.; Internet Modem, ISDN, Cable Modem, ADSL, WLL, etc. Fatter pipes Electronic imaging tends to consume tremendous amounts of da ta and bandwidth . Curre nt connections to the home consist mainly of modems running at 33.6Kbps or 56Kbps. These connection speeds are unac- ceptable to end users dealing with still images, let alone video. Fatter pipes into the home are essential to prolif- erate any type of imaging services or to sell any type of imaging appliances tha t in tend to make use of the Internet infrastructure. The current model calls for the Home Network (HPNA, HRFWG, 1394, 10/100BaseT, Powerline, etc.) home user to contract with an Internet service provider (JSP) for a flat-rate monthly fee. The ISP typically p rovides a d ial-up line that the con- sumer uses with a standard (V.90 or V.34) modem that provides a maxi- mum 56Kbps download speed and 33Kbps upload speed. Typical cost is approximately $20 per month. Many new technologies have been devel- oped in an effort to increase the amount of bandwidth available to the home consumer. As the bandwidth to the home ~051 reference model .. ... -·· ... ... .. - ... .... .. .. ........ ........... ......... ........... ........... ·. ·. · .. ......... ............. ........... .......... .......... ... ... ... ... ... ... ... .. .. .... .... .. .. .. ..... .. ..... .. .. ·. ·. 64 NOVEMBER 2ooo Embedded Systems Programming I in creases, Inte rn e t a ppliances will begin to prolife rate. This in turn will drive the adoption of home net- works. It is not necessary that the channel into the home uses the same media and interfaces as the devices residing within th e home. Most homes will have a gateway device to provide Inte rn et access on one side and home netwo rk access on the other side. This mirror the situation in an office e nvironme nt, whe re most users connect via 10/ 100 BaseT to a central location that provides a T1 or other WAN-style connection to the Internet. Figure 1 shows what a typical consume r may have fo r a home networking solution. Establishing wider pipes into the home does not solve all problems of imaging and multimedia devices. The packet-switched nature of the TCP / IP protocol stack provides no guarantee of ar rival time of data. In fact, it is quite possible that data packets will

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