The Difference Between SDH & DWDM

Save

SDH, or Synchronous Digital Hierarchy is a standard for data transmission. DWDM, or Dense Wavelength Division Multiplexing, is a new technology to carry data in fiber optic cables. DWDM does not replace SDH, but may make it unnecessary.

History

  • The telephone industry developed a technology called Time-Division Multiplexing, TDM, which allows multiple conversations to share one wire by giving each conversation its own short time period to use the wire. SDH is a technical standard that allows TDM to be used for data.

More Capacity

  • TDM was designed for wires, and there are limits to how fast the data stream can be sent. DWDM was designed for optical cable, and sends multiple data streams simultaneously by splitting the streams into different wavelengths of light. DWDM is at least 32 times more efficient than TDM. DWDM is an enhanced version of Wavelength Division Multiplexing, WDM, but the terms may be used interchangeably.

Other Benefits

  • SDH was designed to be used with TDM technology. DWDM can also carry SDH data. This backwards compatibility reduces the costs of implementation for existing networks. For future networks, SDH may not always be used since DWDM can carry a wider range of data types; additionally, other standards may be more efficient for some networks.

Geography

  • SDH is used in most of the world, but the North American equivalent is Synchronous Optical Network, or SONET.

References

  • Photo Credit Spike Mafford/Photodisc/Getty Images
Promoted By Zergnet

Comments

Resources

You May Also Like

  • What Is PDH?

    PDH, or Plesiochronous Digital Hierarchy, is a conventional technology used to transport large quantities of data over digital transport media, such as...

  • What Is the Difference Between the Cadillac CTS & STS?

    General Motors produces the Cadillac CTS and STS luxury sedans. Manufactured in the United States, these sedans have 3.6-liter, V-6 engines with...

  • What Is a SDH VC3?

    The way that two computers communicate has evolved over the years, allowing for faster rates of data exchange. While the US relies...

  • Difference Between Spectrometer and Spectrophotometer

    Scientists, including astronomers, physicists and chemists, use special tools to evaluate the properties of elements, objects or substances that emit light. For...

  • Differences Between SDH & PDH

    An early computing problem was the development of hardware systems that could effectively and securely move huge amounts of data from one...

Related Searches

Check It Out

Geek Vs Geek: Robot battles, hoverboard drag race, and more

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!