This document provides an overview of Synchronous Optical Network
(SONET), represented in images.
Tables and diagrams courtesy of JDS Uniphase
There are no specific requirements for this document.
This document is not restricted to specific software and hardware
Technical Tips Conventions for more information on document
This section provides an overview of SONET in a graphical
Figure 1 shows what a SONET link looks
Figure 1 – A SONET Link
Figure 2 shows the Synchronous Transport
Signal level 1 (STS-1) frame structure.
Figure 2 – STS-1 Frame Structure
Figure 3 shows the STS-1 Transport and Path
Overhead (SONET Overhead).
Figure 3 – STS-1 Transport and Path Overhead
Figure 4 looks at OC-12
Figure 4 – OC-12 Concatenation
Figure 5 displays the SONET
Figure 5 – SONET Hierarchy
Figure 6 shows how SONET maintenance
Figure 6 – SONET Maintenance Interactions
Table 1 lists what the alarms mean, and
their detection criteria.
Table 1 – Meaning of Alarms and their Detection
Figure 7 and Figure
8 provide a description of all the bytes from STS-1 SOH, Line OverHead
(LOH), Path OverHead (POH) and Virtual Tributary Path OverHead (VT
Figure 7 – SOH Section Overhead
Figure 8 – LOH Line Overhead