With the remarkable development in Internet usage, the need to provide faster connection speeds continues. Out-of-date technologies such as modems can not often provide the necessary increase in speed (bandwidth). A number of new technologies are being developed with 'DSL', that provides high speed over existing telephone cabling becoming increasingly popular. DSL service can be delivered simultaneously with wired telephone service on the same telephone line. This is possible because DSL uses higher frequency bands for data. On the consumer premises, a DSL filter on each non-DSL outlet blocks any high-frequency interference to enable simultaneous use of the voice and DSL services. The common types of DSL are as follows:
Traditional asynchronous DSL sends internet data over telephone lines at speeds of hundreds of kilobits per second. What makes it asynchronous is that the download speed is usually much faster than the upload speed, making it fine for people who consume a great deal of information, but limiting its practicality for those who need to provide information to the internet. If you upload a lot of large files to sites on the internet, this may not be the best connection method for your office.
Synchronous DSL is like ADSL but with one key difference - it offers the same speeds for uploading as it does for downloading. SDSL is extremely common in business offices because it gives them the benefit of DSL - a faster private connection to the provider that is not shared with other users - while also giving them enough upstream speed to run servers.
ISDN DSL operates an integrated switched digital network connection over a DSL line. ISDN is a somewhat old system for digital communication over telephone lines that requires special hardware. An IDSL connection lets consumers operate an ISDN connection over a DSL line. While it is extremely slow - offering just 128 kbps of speed - IDSL it is extremely strong, making it possible for people who are relatively far from the telephone company's central office to still get a connection.
HDSL is available in both synchronous and asynchronous flavors. Instead of just using two wires, an HDSL connection uses four wires. With the extra connection, HDSL is able to send more data, enabling it to achieve speeds of well over 1 million bits per second, instead of the hundreds of thousands that traditional ADSL and SDSL connections achieve.
A naked DSL (a.k.a. standalone or dry loop DSL) is a digital subscriber line (DSL) without a PSTN (analogue telephony) service - or the associated dial tone. In other words, only a standalone DSL internet service is provided on the local loop. What happens is a cable runs from the telephone switch to a piece of equipment called a Plain Old Telephone Service (POTS) splitter. This splitter separates the DSL and voice bands. Thus the customer will have a dial tone, which allows them to use the telephone line as a regular land line while they are using it to access the Internet on their computer. A cable carrying both services runs from the splitter to the cable head, where it continues on to the customer on outside plant. For those interested with this type of service you might want to check out the competitive Naked DSL plans offered by iiNet.
What's the difference between regular and naked DSL?
In Regular DSL, data transmission is carried on soundless high frequencies on a standard POTS Plain Old Telephone Service telephone line.
The original idea was to leverage prevailing telephone lines for high speed data communication. DSL and telephone service can coexist on the same phone line and do not interfere with each other. From a Telco's point of view, DSL gives them the ability to sell the same telephone line twice, to the same customer. It is an idea that benefits the telco (who makes more money) and the customer (who gets a high speed data connection without the need for installation of expensive new cables.)
Naked DSL has the same as standard DSL, except that there is no voice service. Telephone service is not required for DSL to operate correctly.
The primary advantage of Naked DSL is cost: the customer saves the expense of a phone line, which they may not need.
In terms of equipment, physical setup and speed, there is no difference between Naked DSL and Regular DSL. They are identical, except for the absence of dial tone.
