What is another word for synchronous digital hierarchy?
Pronunciation: [sˈɪnkɹənəs dˈɪd͡ʒɪtə͡l hˈa͡ɪ͡əɹɑːki] (IPA) 
Synchronous digital hierarchy is a communication protocol used for transmitting data in telecommunications networks. Some synonyms for this term include SDH, digital multiplexing hierarchy, and pulse-code modulation. Other related terms include broadband, optical network, and fiber optic cable, which are all part of the technology infrastructure required to support SDH. Additionally, there are various communication protocols that are comparable to SDH, such as asynchronous transfer mode (ATM) and SONET (Synchronous Optical Network). While each of these protocols differs slightly in their implementation and functionality, they all share the goal of providing reliable and efficient high-speed data transmission.
