Exfo FTB-800 Series for FTB-1 Manual de usuario descargar pdf (Pagina 564)

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101

Glossary

554 FTB-700G/800 Series

G.709 Optical Transport Network (OTN)

 Optical Payload Unit (OPU)

The primary overhead field associated to the OPU is the Payload

Structure Identifier (PSI). This is a 256 bytes multi-frame where its

first byte is defined as the Payload Type (PT). The remaining 255

bytes are currently reserved.

The other fields in the OPU overhead are dependent on the

mapping and concatenation capabilities associated to the OPU.

For an asynchronous mapping (the client signal and OPU clock are

different) Justification Control (JC) bytes are available to

compensate for clock rate differences, two methods are supported

Asynchronous Mapping Procedure (AMP) and Generic Mapping

Procedure (GMP). For a purely Bit-Synchronous Mapping

Procedure (BMP) (client source and OPU clock are the same), the

JC bytes become reserved (set to 0). Concatenation bytes are also

available as described in ITU G.709.

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Exfo FTB-800 Series for FTB-1 Manual de usuario Pagina 564

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