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Re: [802.3_100GNGOPTX] 802.3bj Auto-negotiation consensus building

Anthony,

 

I don’t know whether your post was intended for the reflector or not. However, you raised an important point:

 

There may be scenarios where certain links are short and others are long, so the FEC could be turned off on the shorter links to save power.

 

I agree with that, however this could be built into the startup behavior. What we need to know is whether there is a requirement to turn on/off FEC for a link that is already running.

 

 

Hugh.

 

 

 

From: Anthony Torza [mailto:anthony.torza@xxxxxxxxxx]
Sent: Friday, December 02, 2011 8:49 AM
To: Hugh Barrass (hbarrass); STDS-802-3-100GNGOPTX@xxxxxxxxxxxxxxxxx
Subject: RE: [802.3_100GNGOPTX] 802.3bj Auto-negotiation consensus building

 

There could be some power savings if FEC can be turned off for certain links and the associated logic could be clock or power gated.

 

For example, in a system with a central switch card(s) and 12 line cards, cards 1,2,3 10,11,12 could all use FEC (longest traces) and cards 4,5,6,7,8,9 could turn it off (shorter traces).