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What is SDH?

What is SDH?

SDH is the abbreviation of Synchronous Digital Hierarchy, which refers to multiplexing techniques and technology used in networking and telecommunications. It is the most popular standard being used in the whole world. The SDH proved a high-speed transfer of data and digital signals. Due to synchronization, Synchronous Digital Hierarchy provides a flexible and simple network infrastructure.

Synchronous Digital Hierarchy provides key advantages over plesiochronous digital hierarchy (PDH). Synchronous Digital Hierarchy is interoperable with SONET. SDH is appropriate as a transmission system for broadband ISDN and for transporting ATM cells, PDH signals, Ethernet aggregations, etc.

Synchronous Digital Hierarchy introduces the Synchronous Transport Module (STM) with different levels. The basic level is STM with a data rate of 155.52 Mbps. Other levels are STM-4 (622 Mbps), STM-16(2488 Mbps) or STM-64 (9,953 Mbps).

Advantages of SDH

  • Simplified multiplexing and demultiplexing technique.
  • Operable with existing PDH system
  • Supports of multi-point networking.
  • Can transport broadband signals
  • Multi-vendor support
  • Video conferencing, and interactive multimedia transport capability
  • Enhanced administration and maintenance process
  • Synchronous Digital Hierarchy provides quick recovery from failure.

Disadvantage of SDH

  • Direct adding and dropping of lower-rate signal increases the complexity of the system.
  • Usage of Software in Synchronous Digital Hierarchy system is vulnerable to computer viruses.
  • The equipment used in Synchronous Digital Hierarchy system is complicated.
  • Costly from previously used system PDH.

Asad Ijaz

Hey there, I'm Asad Ijaz Khattak, and I'm not your typical writer and blogger – I'm the voice behind the scenes at the renowned website, "networkustad.com." When it comes to the digital realm, I'm all about technology, networking, and cybersecurity. Picture this: I'm not just someone who writes about tech; I'm a certified expert in the field. I proudly hold the titles of Cisco Certified Network Professional (CCNP) and Cisco Certified Network Associate (CCNA). So, when I talk about networking, I'm not just whistling in the dark; I know my stuff! My website is like a treasure trove of knowledge. You'll find a plethora of articles and tutorials covering a wide range of topics related to networking and cybersecurity. It's not just a website; it's a learning hub for anyone who's eager to dive into the world of bits, bytes, and secure connections. And here's a fun fact: I'm not a lone wolf in this journey. I'm a proud member and Editor of Team NetworkUstad. Together, we're on a mission to empower people with the knowledge they need to navigate the digital landscape safely and effectively. So, if you're ready to embark on a tech-savvy adventure, stick around with me, Asad Ijaz Khattak. We're going to unravel the mysteries of technology, one article at a time!"

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  3. What is PDH? – NetworkUstad
    September 14, 2021 @ 10:19 pm

    […] telecommunications network technology started in the 1960s. The system is been superseded by the SDH and SONET developed in the late 1980s. The plesiochronous digital hierarchy is widely used in […]

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