Understanding 100G OTN Error & Alarm Conditions – LOL

On , in All Posts, Client Side, Errors & Alarms, General, OTN, by Tony Goodchild

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 value […]

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Understanding 100G OTN Error & Alarm Conditions – LOFLANE

On , in All Posts, Client Side, Errors & Alarms, OTN, by Tony Goodchild

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 Lock […]

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Understanding 100G OTN

On , in All Posts, Client Side, General, OTN, by Tony Goodchild

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 Lane (OTL). […]

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Staged CFP Testing

On , in All Posts, Client Side, by Tony Goodchild

Unlike previous pluggable transceiver modules there is a real requirement to test the CFP in a staging area prior to deployment. Previous devices such as the SFP or XFP currently are available with commodity pricing from almost $50 to a a few thousand dollars depending on the required interface support. In comparison the CFP can […]

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Understanding Polarisation Multiplexing

On , in All Posts, General, Line Side, by Tony Goodchild

Polarisation multiplexing is commonly used in 100Gb/s line side transmission as a method to increase the bit rate over the line without increasing the transmitted symbol rate. Using polarisation controllers it is possible to generate two perpendicular polarised optical signals on the same wavelength for transmission through a single fibre. As two separate signals are […]

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Testing The Physical Interface

On , in All Posts, Client Side, Ethernet, General, OTN, by Tony Goodchild

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 testing […]

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Understanding The Difference Between The Line Side And The Client Side

On , in All Posts, Client Side, General, Line Side, by Tony Goodchild

So what exactly is the difference between the line side and client side of the network?   The client side of the network is where traffic will come on-ramp into the optical backbone. In this case the client side interface will be used to interconnect between the metro networks and the optical backbone. So why […]

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