Understanding 100G Ethernet Error & Alarm Conditions – Loss Of Block Lock

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

On the 100G Ethernet interface the Loss Of Block Lock (LOBL) alarm is raised when it is not possible to lock onto the sync. header within the 64b/66b line coded blocks. As the serial stream of blocks are distributed over the 20 PCS lanes during transmission the LOBL alarm should be reported within a specific […]

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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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A New Sublayer

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

The multi-lane architecture within 100G Ethernet that comprises the PCS Lanes, CAUI and Gearbox (depending on CFP) represent a whole new sublayer of the network that must be specifically tested. This new sublayer exists only between two directly adjacent network elements that are connected via the CFP interfaces. To support this there are a number […]

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Understanding The 100G Ethernet Client

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

The client interface for 100Gb/s Ethernet is standardised in IEEE802.3ba as an amendment to the full 802.3 specification. The client interface for Ethernet at 40Gb/s and 100Gb/s is fundamentally different from the earlier 10Gb/s and lower rates. At these lower rates the interface is specified as a serial stream of data that is line coded […]

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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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