Types Of DSLDSL stands for Digital Subscriber Line. The transmission throughput of DSL is symmetrical in downstream (from a company to a subscriber) and upstream (from a subscriber to a company) directions. The transmission throughput of DSL is symmetrical in downstream (from a company to a subscriber) and upstream (from a subscriber to a company) directions and the total throughput of a DSL connection is 1.6 Mbps (Mega bytes per second). Now, you are clear with the basics of a DSL, let us study the types of DSL available in the market. Generally, DSL is divided into 2 main categories i.e. Symmetric and Asymmetric. Symmetric DSL is further sub-divided into ADSL (Asymmetric Digital Subscriber Line), RADSL (Rate-Adaptive Asymmetric Digital Subscriber Line) and VDSL (Very-high-speed Digital Subscriber Line). Asymmetric DSL is further sub-divided into SDSL (Symmetric Digital Subscriber Line, Single-line DSL), SHDSL (Symmetric High-Bit-Rate Digital Subscriber Loop) and HDSL (High-data-rate DSL, High-speed DSL).
1. ADSL ADSL stands for Asymmetric Digital Subscriber Line. ADSL is mainly meant for small home users as it is able to provide much higher download speeds. The only drawback being that it provides high download speed at the expense of upload speed. In other words, upload speed is much slower than download speed. In ADSL, you can get speeds up to 2 Mbps for downstream and 512 Kbps for upstream. 2. RADSL RADSL stands for Rate-Adaptive Asymmetric Digital Subscriber Line. RADSL is just the enhancement of ADSL that provides high speed by automatically adjusting the quality. This is helpful in case of long distance. In RADSL, modem is configured at the boot up whereby it checks the quality of the line and then makes the adjustment, if required. 3. VDSL VDSL stands for Very-high-speed Digital Subscriber Line. VDSL was designed to support high bandwidth applications like HDTV as it has the capability to provide throughput of 51 Mbps. VDSL achieves this exceptionally high speed using the optic fiber cable but due to high cost and less demand, it's existence is almost NIL. 4. SDSL SDSL stands for Symmetric Digital Subscriber Line or Single-line DSL. SDSL is the first DSL service that makes no difference between upload and download speed. In other words, both upload and download speed have a similar rate. Also, SDSL includes all the features of a typical DSL connection and it has a throughput of around 3 Mbps. 5. SHDSL SHDCL stands for Symmetric High-Bit-Rate Digital Subscriber Loop. SHDSL is based on the copper wire technology to transfer data at high speeds that varies from 192 Kbps to 2 Mbps. SHDSL is a very attractive option for small business users. 6. HDSL HDSL stands for high-data-rate DSL or high-speed DSL. HDSL is similar to SDSL i.e. it also supports similar download and upload speeds and this is achieved with the use of multiple phone lines. Also, HDSL possesses all the features of a typical DSL connection and has a throughput of around 2 Mbps. So, now you will have a clear picture of the types of DSL available in the market and it will be easier for you to select the one that is best suited to your needs. |