Exfo FTB-800 Series for FTB-1 Manuel d'utilisateur télécharger pdf (Page 568)

100

101

Glossary

558 FTB-700G/800 Series

G.709 Optical Transport Network (OTN)

ODU Multiplexing

The ODU multiplexer is a function that allows the multiplexing of ODU

tributary signals into higher OTN signal rates. The G.709 standard supports

2 types of ODU multiplexer which can be classified as follows:

 Legacy architecture is based on multi-stage architecture to bring an

ODUk client to a higher OTN interface rate. This multiplexer is

identified by Payload Type 20 (PT 20).

 New architecture uses a single stage architecture to bring an ODUk

client to any higher OTN interface rate. This method supports the

ODUflex client signal. The multiplexer is identified by Payload Type 21

(PT 21).

Note: Refer to the OTN BERT on page 40 for the ODU multiplexing capabilities.

The multiplexing strategy is based on the concept of tributary slots, which

is similar in concept to the SONET timeslot. The multiplexing of 4 ODU1 in

one ODU2 is made by distributing the ODU1 structure in a repetitive

sequence of 4 ODU2 Tributary slots, a similar strategy is used for ODU3

multiplexing where the repetitive sequence is made of 16 ODU3 tributary

slots, refer to G.709 standard for detailed information.

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Exfo FTB-800 Series for FTB-1 Manuel d'utilisateur Page 568

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