SDH128

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Synchronic Digital Hierarchy (SDH) is a set of communications standards used in telecommunications and data communications systems. It is the successor to Plesiochronous Digital Hierarchy (PDH), and it is widely used in Europe and most of the rest of the world, with the exception of North America. SDH is used to transport multiple types of digital signals, including voice, video, and data, across a wide range of distances using existing fiber-optic networks. SDH is considered a more efficient and cost-effective method of transport than traditional PDH systems and can be used with both wireless and wired networks.

SDH128 is a type of transport used with SDH networks. It is based on a 128 byte payload, which is the same size as other representations such as ATM, IP, and Ethernet. The 128 byte size offers flexibility in terms of the amount of bandwidth that can be allocated to different types of data and its ability to quickly move data around the network. The smaller size also enables SDH128 to support a large number of simultaneous connections.

The main application field of SDH128 is broadband access. This technology enables access to high-speed broadband services such as video, data, and voice over existing fiber networks. The 128 byte payload makes it ideal for applications such as IPTV and VoIP. This type of transport also has the ability to support high-speed data services such as Gigabit Ethernet and 10 Gigabit Ethernet.

The way SDH128 works is based on fixed-length frames and cells. Each frame is 128 bytes in size and contains a header, payload, and a cyclic redundancy check (CRC). The header contains control and management information such as source and destination addresses and other service related data. The payload is the actual content of the message such as voice, video, or data. The CRC allows the receiver to check for frame corruption due to transmission errors.

The frames are then grouped into cells, which are the basic transmission units. Cells are either transmitted over a single physical link or multiplexed over several physical links. Each cell consists of a header and a payload, and the header contains the origin and destination addresses as well as other control information. The payload contains real data such as voice, video, or data.

Once the cells have been transmitted, they are reassembled at the other end. The cells are put back together and the payload is extracted. The payload is then passed to the necessary application or service. SDH128 is a reliable and efficient method for transmitting digital data over existing fiber networks, and as such, it is a vital part of many high-speed data services today.

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