[802.3_100G-OPTX] TX Average Power Min.

["Brian Welch (bpwelch)" <00000e3f3facf699-dmarc-request@xxxxxxxxxxxxxxxxx>]

Picking up this thread to discuss the TX average power min topic.

 

While it is true that TX average power is not the principal indicator of transmitter performance, it is the most common indicator of transmitter performance, including in the following ways:

• Since it is a DC measurement it is typically used on all parts as part of a production test flow, whereas OMA/ER (which require a HS scope to test) are often just done in DVT, qual, and then on a sampling basis as part of an ORT/ORM process.
• TX average power is also typically what is reported in the memory map (again, because it is easy to measure on chip), and as such is used in network telemetry systems to monitor transmitter performance and aging.
• It is also easy to test in the field, so link debug will generally start with an average optical power measurement and only progress to an OMA/ER measurement if necessary (and then generally require removing the part from the field and returning to the manufacturer).

 

All of this is to underscore that this is probably one of the most noticed parameters in a spec, and modifying the spec in such a way that you create inconsistencies between 100GBASE-DR and 100GBASE-FR1 would quickly be noticed in the field. I recommend keeping the 100GBASE-FR1 TX average power min spec equivalent to that in 100GBASE-DR.

 

Thanks,

Brian

 

From: David Lewis <David.Lewis@xxxxxxxxxxxx>
Sent: Monday, April 6, 2020 4:02 PM
To: STDS-802-3-100G-OPTX@xxxxxxxxxxxxxxxxx
Subject: [802.3_100G-OPTX] 802.3cu - Results of offline comment resolution discussions

 

All,

In order to increase the speed of comment resolution in our teleconference calls, a group of us met off-line to work through some of the comments that were unresolved during our last call.  We came to the following proposed resolutions:

 

Comment #	Commenter	Topic	Proposed resolution	Note
54	Eric Maniloff	Tx Avg Power	Accept
103	Mike Dudek	Interop	Accept in principle	Max loss of DR channel is 3.0 dB, not 2.6.  So proposed value for max loss should increase by 0.4 dB to 5.2 dB.
104	Mike Dudek	Interop	Accept in principle	Max loss of DR channel is 3.0 dB, not 2.6.  So proposed value for max loss should increase by 0.4 dB to 4.5 dB.
105	Mike Dudek	Interop	Accept
106	Mike Dudek	Interop	Accept
115	Mike Dudek	Interop	Accept
116	Mike Dudek	Interop	Accept

 

During tomorrow’s call, we will ask if there are any objections to these resolutions, and if there are none, we will move on to other topics.

 

Thanks,

David Lewis

 

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