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OTN Interfaces | Difference between OTU1,OTU2,OTU3,OTU4

This page compares OTN Interfaces OTU1 vs OTU2 vs OTU3 vs OTU4 and mentions difference between OTU1, OTU2, OTU3 and OTU4 OTN interfaces. Here OTU stands for Optical Channel Transport Unit and OTN stands for Optical Transport Network.

• OTN (Optical Transport Network) consists of various optical network elements connected by optical fiber lines.
• They are used for supporting various functionalities in order to maintain optical links carrying client optical signals.
• Typical functions include multiplexing, transport, switching, management, supervision, survivability etc.
• It is defined in ITU-T G.709 standard.
• It uses WDM (Wavelength Division Multiplexing) unlike SDH/SONET.

OTU client signal mapping

The figure-1 depicts OTU client signal mapping.

Specifications OTU1 OTU2 OTU3 OTU4
Line rate (Mbps) 2.666 10.709 43.018 111.809
Payload Rate (Mbps) 2.488 10.037 40.150 104.794
Frame period (µs) 48.971 12.191 3.034 1.167
Frequency accuracy (ppm) +/- 20 +/- 20 +/- 20 +/- 20
Application It transports SONET OC-48 or SDH STM 16. It transports OC-192, STM-64 or WAN PHY for 10GBase-W . It transports OC-768, STM-256 ot 40 GB ETHERNET. It transports 100 GB ETHERNET Signal.

Fiber Optic Network and Optical Components Related Links

DWDM system basics   Fibre optic communication   What is PDMA?   What is WDM?  SONET SDH tutorial   SDH Networks   SDH Frame structure   SDH Modulation   PDH Frame structure   Optical Components  Optical Isolator   Optical Circulator   Optical Amplifier   Optical Filter   Optical Coupler   Optical MUX DEMUX   Optical Equalizer   Optical Switch   Wavelength converter  

What is Difference between

PDH vs SDH  SONET versus SDH   CAS vs CCS  Types of WDM   Single vs multimode fiber  

RF and Wireless Terminologies

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