Understanding 100G Ethernet Error & Alarm Conditions – High BER

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

100G Ethernet includes a process that continually monitors the performance of  received PCS data and triggers an alarm condition in the event that an excessive error ratio is detected. When receiving data at the PCS each lane is checked for errors in the 2 bit sync header in each 66b block. A counter is maintained […]

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How does Skew impact latency measurement?

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

Now more than ever latency is a key network quality metric, with financial institutions and other Enterprise customers demanding absolutely minimal latency from their service provider. With Skew being an inherent part of a 100G Ethernet link, field engineers starting to roll out these services commonly ask how will Skew levels affect the latency measurements […]

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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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Alignment Markers And Associated Alarm & Error Conditions

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

The alignment marker is used for the identification of the PCS lanes. They allow the receiving network equipment to identify the lanes as they are received so that that they can be re-ordered. So what is an alignment marker? An alignment marker is a single 66 bit block that is inserted into the stream of […]

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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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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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