×
Create a new article
Write your page title here:
We currently have 3,187 articles on s23. Type your article name above or create one of the articles listed here!



    s23
    3,187Articles

    Synchronous Digital Hierarchy

    SDH (Synchronous Digital Hierarchy) is a standard technology for synchronous data transmission on optical media.

    It is the international equivalent of Synchronous Optical Network. Both technologies provide faster and less expensive network interconnection than traditional PDH (Plesiochronous Digital Hierarchy) equipment.

    In digital telephone transmission, "synchronous" means the bits from one call are carried within onetransmission frame.

    "Plesiochronous" means "almost (but not) synchronous," or a call that must be extracted from more than one transmission frame.

    SDH uses the following Synchronous Transport Modules (STM) and rates:

    STM-1 (155 megabits per second),

    STM-4 (622 Mbps),

    STM-16 (2.5 gigabits per second), and

    STM-64 (10 Gbps).

    Cookies help us deliver our services. By using our services, you agree to our use of cookies.
    Cookies help us deliver our services. By using our services, you agree to our use of cookies.