[CentOS] how to enable Flow Control on CentOS?
lowen at pari.edu
Mon Jul 11 20:13:39 UTC 2011
On Friday, July 08, 2011 07:06:06 PM Les Mikesell wrote:
> gigabit spec requires auto-negotiation.
According to clause 22.214.171.124 "User Configuration with Auto-Negotiation" of IEEE 802.3-2008, auto-negotiation with 1000Base-X is optional, but encouraged.
In contrast, for 1000Base-T, we find the following information in clause 40.5.1:
"40.5.1 Support for Auto-Negotiation
All 1000BASE-T PHYs shall provide support for Auto-Negotiation (Clause 28) and shall be capable of operating as MASTER or SLAVE."
'Shall' being legal language for 'absolutely without a doubt must' in this case. Overwise the PHY wouldn't be able to determine which PHY is the clock MASTER.
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