Optical Multiplex Section Termination

The following processes are the responsibility of the optical multiplex section (OMS) trail termination, I.E the processes initiate at the point of trail termination:  

•validation of connectivity integrity 

•assessment of transmission quality 

•transmission defect detection and indication 

 As was the case with the optical channel, the optical multiplex section (OMS) consists of a pair of bidirectional but co-located optical channel termination source and sinks functions.  

•Optical multiplex section termination source: accepts the adapted information from a client layer network at its input inserts the OMS overhead and presents the characteristic information of the OMS layer network at its output.  

•Optical multiplex section termination sink: accepts the characteristic information of the OMS layer network at its input extracts the OMS overhead and presents the adapted information at its output.  

Optical Multiplexor Section Layer

The Optical Multiplexor Section layer will be responsible for handling the preparation, grooming, and signal equalization of client signals prior to and during the multiplexor process. The OMS layer provides the path for the transport of client signals that the transponders in the optical client layer have transformed to wavelengths in preparation for their travel through the optical multiplex section trail. 

The characteristic information that exists in the optical multiplex section layer comprises two distinct logical signals:  

1.       A data stream that represents the adapted client data stream produced by the transponders in the optical channel layer 

2.       A data stream that represents the optical multiplexor section overhead (OMS)  The Optical Multiplexor Section provides the functionality for processing and networking multi-wavelength optical signals. In OTH parlance multi-wavelength can also represent a single wavelength. 

The Optical Multiplexor Section layer capabilities include the following functionality:  

• ·       Overhead processes that ensure the integrity of the multiplexor section information that has been used to adapt the original client signal 

• ·       Processes that enable the section level  operation and management functions such as section survivability  

The process for obtaining an OMS signal consists of the following steps:  

1.       The modulation of a clients signal by the optical signal section 

2.       Allocation of a specific wavelength or frequency to the optical carrier signal 

3.       Generation of the OMS overhead