Figure 8 shows the stack for cOCx/STMx interfaces.
Figure 8: Stack for cOCx/STMx Interfaces
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Note: For a detailed description of interface types and specifiers, see Interface Types and Specifiers in JUNOSe Command Reference Guide. For information about interfaces, see Planning Your Network in JUNOSe System Basics Configuration Guide. |
The section layer manages the transport of STS/STM frames across the physical path. This layer is responsible for frame alignment, scrambling, error detection, error monitoring, signal reception, and signal regeneration.
The line layer manages the transport of SONET/SDH payloads, which are embedded in a sequence of STS/STM frames in the physical medium. This layer is responsible for multiplexing and synchronization.
The path layer maps the user payload into a SONET/SDH format suitable for the line layer. This layer transports the actual network services (such as T1s and T3s) between SONET/SDH multiplexing devices and provides end-to-end transmission.
When you configure a cOCx/STMx interface, be sure you understand its position in the SONET or SDH hierarchy. This implementation of SONET and SDH uses the term path to identify an STS-1 or STM-1 line. You must know how to identify the path for the configuration and the higher-level controllers, such as T3 or unframed E1 over SONET VT.
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