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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The Gloves Are Off in the Battle of Broadband

Broadband is a common facility in most modern homes, the rise in speeds over the past few years has seen prices tumble to keep in line with what customers are willing to spend. For the price you paid for a 128kb connection four years ago, you can now expect to receive an average speed of 2MB broadband from some suppliers.

With nearly every household being able to afford some form of Broadband package these days most suppliers are now faced with the battle to gain your loyalty, attractive new customer packages are a plenty on our televisions and in order to make your company appear as the better choice some companies have resorted to boasting and mud-slinging to get you to switch on.

Virgin and BSkyB are two such competitors who are in direct competition for customers, both now offering universal packages comprising of Broadband, Television and Telephones. Both companies have put out slightly misleading advertising campaigns belittling the opponent, who in turn have filed complaints to the Advertising Standards Agency (ASA).

BSkyB complained, amongst other competitors as well, that Virgin Media had unfairly compared the speed of their 8MB broadband to Virgin's 2MB deal, Virgin claimed their cabling did not degrade the further you lived from your telephone exchange as they use fibre optics rather than the older telephone lines comprised of copper. Other complaints included the omission of the prefix "up to" when describing broadband speeds.

The "up to" scandal is one that has plagued broadband companies for the past year or two, when they advertise speeds companies are now required to say that advertised speeds are only if you have a very good connection and since a good proportion of customers aren't going to fit in this category then they should be warned that they may not get exactly what they think they're paying for,

The best way to find out if your current broadband is up to scratch is to find out how far away from your local exchange you are, the closer you are the better your broadband will be, if you use an online broadband speed test are another way to determine the actual speed, but don't fret if you are getting below half the advertised speed, this is fairly common and something the government is looking into changing.

Companies like Virgin are changing this by installing fibre optic cabling to increase the strength of the signal over long distances, in countries like Japan they already have this technology and can handle much faster speeds that make our "high speed" broadband seem pedestrian in comparison.

If you are looking for cheap broadband whether you have an existing provider or not then you can compare broadband deals online. Also if you are thinking about changing your supplier then check your connection using one of the various broadband speed test websites to see whether you are getting your money's worth.

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