BSIT 220-T301 Week 7 Blog

 Good Evening,


Welcome back to my weekly blog where we talk about what is going on in this weeks course work. One thing that stuck out to me this week was SONET and SDH. Lets dig a little deeper on some similarities and differences between the two. 

SONET - Synchronous Digital Hierarchy was standardized by the ANSI (American National Standards Institute) defines a hierarchy of interfaces and frame formats for transmitting multiple digital bit steams over optical fiber. 

SDH - Synchronous Digital Hierarchy was standardized by the ITU-T (International Telecommunication Union - Telecommunication Standardization Sector). It is largely compatible with SONET but has some technical differences. 

SONET uses Optical Carrier (OC) levels to designate different transmission rates. The basic unit is the Synchronous Transport Signal (STS) which is like the European STM-1 (Synchronous Transport Module Level 1) in SDH.

SDH uses Synchronous Transport Module (STM) levels to designate different transmissions rates. The basic unit is the STM-1, which is like the SONET STS-1

SONET is used in North America and parts of Asia

SDH is mainly used in Europe, Latin America, and other parts of the world.

Both SONET and SDH include standards for network management, including performance monitoring, fault management, and provisioning of circuits. 

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