Posts Currently viewing the category: "OTN"

Deploying networks using CFP transceivers presents a set of challenges that did not exist with previous generations of Ethernet. Any CFP based 100G Ethernet deployment will commonly use a WDM interface – the only exception to this is in the case of using SR10 CFPs – and this in itself is enough to require a…(Read More)

Loss Of Lane Alignment (LOL) is declared on 100G interfaces when it has not been possible to successfully recover the Logical Lane Marker (LLM) from the logical lanes and then re-assemble the OTU4 frame. During the lane recovery process the LLM will be present in a lane every 16320 bytes, when the same LLM…(Read More)

At 100G speeds OTN uses a multilane implementation to achieve the OTU4 client interface. Using these multilane interfaces can present a number of challenges and new defect conditions have been defined to support these. LOFLANE is a loss of frame defect on a logical lane. In some ways it is similar to Loss Of Block…(Read More)

OTN uses a similar multi-lane mechanism to 100G Ethernet to achieve 100G rates. The parallel interfaces are defined in an appendix of the G.709 recommendation.  The recommendation includes definitions of parallel interfaces for both 40G and 100G rates and within this a new signal was defined for parallel interfaces – the Optical Channel Transport…(Read More)

100G testing plans must include specific attention to the physical interface. The CFP interface is no longer a single transmitter and receiver pair that can simply be checked with simple tests such as a basic optical power measurement or receiver sensitivity measurement. Utilising multiple optical lanes simultaneously makes testing the interface more complex and also…(Read More)

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