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N1680A OC-48/STM-16 SONET/SDH Test Module

No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. They correspond to both the physical and the data linkThey correspond to both the physical and the data link layers. SONET defines four layers: path, line, section, and photonic.

Note 8. Figure The signal is change from an electronic form to into optical form. Multiplexed with other signal. Encapsulated in a frame. STS multiplexers provide path layer functions.

Understanding the Basic Differences Between SONET and SDH Framing in Optical Networks - Cisco

Line layer overhead is added to the frame at this layer. STS-1 is a specific sequence of bytes 6, bits , which includes various overhead bytes and an envelope capacity for transporting payloads. It can be depicted as a column by 9-row structure. The order of transmission of bytes is row-by-row from top to bottom and from left to right most significant bit first.

As shown in the figure below, the first three columns of the STS-1 frame are for the transport overhead. The three columns contain 9 bytes.

chapter 17: SONET/SDH

Of these, 9 bytes are overhead for the section layer for example, each section overhead , and 18 bytes are overhead for the line layer for example, line overhead. Pointers allow the transparent transport of synchronous payload envelopes either STS or VT across plesiochronous boundaries, i.