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100 Gigabit OTN supports high-bandwidth applications

31 January 2011.
AppliedMicro’s TPACK unit has unveiled its first 100 Gigabit Optical Transport Network (OTN) designs. The first two devices - the TPOT414 and TPOT424 - perform 100 Gigabit mapping and framing functions, while a third is a 100 Gigabit OTN muxponder (multiplexer-transponder) design.
The OTN standard, defined by the telecom standards body of the International Telecommunication Union, has emerged as an important networking technology as operators move away from SONET/SDH to packet transport.  The announcement of AppliedMicro’s 100 Gigabit-per-second (Gbps) OTN hardware enables system vendors to handle 100Gbps signals and multiplex existing 10Gbps and 40Gbps OTN within the 100 Gigabit framing format.
The TPOT414 translates between the 100 Gigabit Ethernet (GbE) and the 100Gbps line side. A typical use is as an interface between two optical modules on a line card: a CFP module that takes in a 100GbE client signal and an MSA-168 long-haul transponder whose electrical input is the OTN OTU4 signal.

The second design, the TPOT424, interfaces to an OTU4 signal made up of a data payload and overhead components. The overhead part that includes a forward error correction (FEC) is terminated - errors corrected and signal measurements made – before the payload is put into a new OTU4 frame and a fresh overhead including a new FEC scheme is applied.

The 100Gbps OTN muxponder uses framing and mapping but adds multiplexing between 10, 40 Gbps and 100Gbps streams. One application is a router taking IP traffic at different rates and framing them before transmission over a 100Gbps dense wavelength division multiplexing (DWDM) network. 
AppliedMicro’s 100Gbps OTN designs are implemented using field-programmable gate arrays (FPGAs) and are being delivered to system vendors this quarter.
by Roy Rubenstein.