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When using Ethernet communications, the data is commonly transmitted by mapping once, using the Optical Transport Network (OTN) communications standard, and is then returned to the Ethernet standard by demapping at the transmission destination.

Using OTN like this has several advantages:

  • A high-reliability network can be configured by using error correction during transmission (Forward Error Correction: FEC).
  • Using the OTN switching function supports data transmission to the destination with assured reliability.
  • Smooth support is assured for legacy standards like SDH/SONET, PDH/DSn, etc., as well as for as-yet-unknown future data mapping standards.

Anritsu test equipment supports OTN FEC function inspections in line with ITU-T standards, while also offering strong support for current SDH/SONET, PDH/DSn inspection standards.


Optical Transport Network (OTN)

The most recent transport solution is OTN, which was defined initially for submarine and core networks. It transports TDM circuits over long distances by providing Generic Forward Error Correction (GFEC). Lately, the standard has undergone major enhancements, supporting extension into non-core networks, and many operators are now looking to utilize the benefits of OTN in their metro and access networks. OTN is seen as the best transport solution because it offers fault management, performance monitoring and protection mechanisms, coupled with a low cost-of-entry point and the ability to support current infrastructure with Ethernet, Fibre Channel, SDH/SONET and PDH/DSn networks.

Synchronous Digital Hierarchy (SDH) and Synchronous Optical Network (SONET)

SDH, defined by ITU-T, and SONET, defined by ANSI, were designed for optical transport at high bit rates. They provide simple multiplexing and demultiplexing with direct mapping of lower levels to higher levels. They are compatible with Plesiochronous Digital Hierarchy (PDH) because they can carry all PDH types in one universal hierarchy. SDH/SONET is synchronized to atomic clocks across the network and can provide traffic protection with backup lines.

Plesiochronous Digital Hierarchy (PDH)

PDH was a first-generation digital transmission system designed to carry both voice and data. It represented the move from analog to digital transmission and was deployed widely, but it is being replaced by other technologies now.




- 100G Multirate Module
- 10G Multirate Module
- OTDR Module
Smart All-in-one Optical and Data Measurements



All-in-one Tester combines a BERT (4ch x 28.2 Gbit/s) and sampling oscilloscope (optical 35 GHz; electrical 40 GHz).