Streamyx Streamyx Streamyx: Jun 6, 2008

ADSL Modems

Users who want to connect to ADSL broadband use the ADSL modem to do so. ADSL modems are a very cost-effective solution for users and are popular across the world, including the US. The ADSL modem enables the transfer of Internet data directly to the computer. The data rates provided by ADSL modems are consistent with North American and European digital hierarchies. Users can purchase these modems from the market with various speed ranges and capabilities. The minimum configuration enables data rates of 1.5 or 2.0 Mbps downstream in a 16 kbps duplex channel. Other configurations offer rates of 6.1 Mbps along with a 64 kbps duplex. One can also opt for products with downstream rates of 8 Mbps and duplex rates of up to 640 kbps.

There are three types of ADSL modems. They are the ethernet ADSL modem, the PCI ADSL modem, and the USB ADSL modem. The ethernet ADSL modem can be fed directly into a PC ethernet port or used to add a modem to certain broadband routers. The PCI ADSL modem fits inside the computer. USB ADSL modems are the most popular form of all ADSL modems, and they are designed for connecting individual computers to ADSL lines.

Now, how does an ADSL modem function? The ADSL modem organizes the stream of aggregate data in blocks. These data are created by multiplexing downstream channels, the duplex channels, and the maintenance channels. While transmitting the data, the ADSL modem attaches an error-correction code to each block. ADSL modems are capable of accommodating ATM transport with variable rates and compensation for ATM overhead, as well as the IP protocols.

ADSL modems can create multiple channels to transfer data. For this, ADSL modems divide the available bandwidth of a telephone line in one of two ways - Frequency Division Multiplexing (FDM) and Echo Cancellation. The FDM assigns one band for upstream data and assigns another band for the downstream data. Further, the downstream path gets sub-divided into one or more high-speed channels by time division multiplexing. Similarly, the upstream path also gets multiplexed into corresponding low-speed channels. Echo Cancellation enables the upstream band to overlap the downstream band. These two bands get separated by means of local echo cancellation. Both Frequency Division Multiplexing (FDM) and Echo Cancellation techniques enable ADSL to split off a 4 kHz region for POTS at the DC end of the band.

However, in spite of the tremendous capabilities of ADSL modems, it is recommended that Internet users using modems should not be awed with the technological capabilities of the modem, and install firewall software for added security.

ADSL provides detailed information on ADSL, ADSL Modems, ADSL Web Hosting, ADSL Routers and more. ADSL is affiliated with DSL Service.

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Broadband - Changing The Way We Call

The world of computer technology is constantly evolving, shaping the way we view the world and communicate in it. Companies are constantly working to develop software and gadgets to save us time and money, whilst ensuring that we are part of the growing trend of connectivity.

One factor in this has been the development and popularity of VoIP (Voice Over Internet Protocol) clients. These have enabled millions around the world the opportunity to communicate with others from around the world through their broadband providers.

VoIP technology operates through a combination of a broadband connection and special adapters that help convert signals sent from one user, these are then picked up by the router. The router, in turn converts the signal into a sound file, which is then picked up, and thusly heard, by the other end user. These adapters are usually provided through purchase of a broadband plan or the computer itself.

VoIP programs rely on a fast and reliable internet connection to ensure clarity on the line and avoid calls dropping out. And with a wide range of cheap broadband deals available, the possibilities are endless, and the use of the webcam feature also helps to add a more personal, face-to-face feel to chatting online.

VoIP technology is also present in the world of business, with companies using VoIP clients, such as Skype, in order to host meetings between departments based elsewhere in the UK and around the world. The opportunity for using such clients for video conferencing is also seen as a useful tool, with competitive rates available for destinations all over the world.

Some software also has features that make use of webcam technology, allowing for face-to-face conferencing to take place. One of the newest programs to come on the scene is ooVoo - a video conferencing client that allows up to 6 people to converse via video. Using a webcam and a broadband connection, users are also able to chat to each other using an instant messaging service, and to send files to each other.

VoIP technology is even beginning to branch out into phone technology, with companies like Skype developing their technology for use on mobile phones. But this technology is also changing the way we make calls from home - with phones that plug into a broadband router now available.

The clarity of the phone line depends on the properties and reliability of the connection; fortunately there are now a wide range of broadband providers to choose from - with some offering deals to cater for those wanting to branch out into a new method of phone communication.

Compare a range of broadband providers to find a cheap broadband deal that suits you.

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