TELECOMMUNICATION ~ Difference between ADSL and VDSL
ADSL (Asymmetric Digital Subscriber Line) and VDSL (Very High Bitrate Digital Subscriber Line) differ mainly in data transmission speed or data rate, where VDSL is significantly faster than ADSL. ADSL provides an upload rate of 64 Kbps to 1 Mbps, and a download rate of 500 Kbps to 8 Mbps while VDSL provides an upload rate of 1.5 to 2.5 Mbps and a download rate of 50 to 55 Mbps.
ADSL and VDSL are variations of DSL technology. DSL stands for Digital Subscriber Line, which generally transforms an ordinary telephone line into a broadband communication link.
Definition of ADSL:
ADSL stands for Asymmetric Digital Subscriber Line. Because of its accessibility, it is the most commonly available broadband technology. And in terms of speed, ADSL may not meet the requirements of Internet dependency. Depending on a number of factors, including your provider and location, download speeds can reach 24 Mbps. This level of speed is sufficient for basic Internet use, such as simple web browsing, but if you are downloading or streaming multimedia content, it is recommended that you upgrade to VDSL or Fiber.
Definition of VDSL:
VDSL stands for Very High Bitrate Digital Subscriber Line. VDSL operates over existing copper lines and offers much faster download and upload speeds compared to ADSL. VDSL is capable of reaching download speeds of over 50Mbps, and upload rates are around 10Mbps. The higher speed is achieved through more efficient use of phone lines that reduce the distance the signal must travel.
Key differences between ADSL and VDSL:
- ADSL provides a downstream rate = 8 Mbps and an upstream rate = 1 Mbps. Whereas, VDSL provides a bit rate of 55 Mbps.
- ADSL technology covers a greater distance than VDSL, where ADSL can cover 18000 feet, and VDSL can reach up to 4500 feet.
- VDSL can support both asymmetric and symmetric data, while ADSL only supports asymmetric data.
- VDSL can offer applications such as high definition television and video on demand that would not be possible with ADSL.
- ADSL is more widely used than VDSL.
- VDSL can easily be affected by attenuation. In contrast, ADSL is immune to attenuation to some extent.
- DMT (Discrete Multitone Technique) is used in VDSL for modulation. On the contrary, ADSL can use CAP (Carrierless Amplitude / Phase) or DMT.
In short:
ADSL and VDSL are types of digital subscriber line technology. VDSL provides higher data rates for a short distance of twisted pair copper telephone lines while ADSL provides lower data rates than VDSL which covers a longer distance. VDSL has some disadvantages such as it is expensive and the signal speed degrades if the distance increases.
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