This archive is a compilation of articles published in our eMagazine since inception. The articles are organized by "Subject". Many thanks to those who have contributed to this archive and continue to help it grow by submitting their thoughts and expertise to the magazine.
With the increased penetration of broadband and with the technological advances in home networking, there is a considerable market demand for the home gateway devices. Currently the applications such as Internet connection sharing, file/print sharing and VPN are driving the sales of Home Gateway boxes, but soon these gateway boxes will be available with Voice, Multimedia and other functionalities also.
The IEEE1394 serial bus is a low cost and high performance bus that interconnects consumer electronics audio video devices and PCs. The 1394 bus enables simple interconnections between devices with a single cable wire. The devices can be plugged in and out of the 1394 network while they are in powered on stage, i.e., hot pluggable. The devices get automatically detected and configured without any necessity for manual configuration. The devices can talk to each other, i.e., peer-to-peer communication, without any intervention or support of Personal Computers. The 1394a standard bus supports 100,200,400 mbps speeds and 4.5 meter cabling. Whereas the latest 1394b standard supports speeds 100,200,400,800 up to 3.2Gbs and Plastic optical cabling (POF) up to 100 meters.
OFDM is a multi-carrier system where data bits are encoded to multiple sub-carriers and sent simultaneously in time. The result is an optimum usage of bandwidth. A set of orthogonal sub-carriers together forms an OFDM symbol. To avoid ISI due to multi-path, successive OFDM symbols are separated by guard band. This makes the OFDM system resistant to multi-path effects.