Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Re: [802.3ae] ask some questions





Hi,

t wrote:
> 
> Sorry, I will ask some questions, and thanks for your helping.
> 
> 1. 10GBASE-W PHYs operate at the STS-192 line rate of 9.95328 Gb/s,
> mapping the encoded
>     data stream at a 9.58464 Gb/s payload rate. The number "9.58464" is
> how to calculate?

This number is the data rate of the payload of the SONET frame
vs the data rate of the frame itself.

> 
> 2. In the 802.3ae spec, link fault signaling of XGMII functional
> specifications in Clause46,
>     what does "UCT" mean in figure46-9 (Link Fault signaling state
> machine, page256)?

Un-Conditional Transfer.

See the editor's note in 49.2.13.1 for references to locations in
the full 802.3 standard for state diagram notations & conventions.

> 
> 3.The 10GBASE-R PCS sends tx_data-unit<15:0> to the WIS at a nominal
> rate of 599.04Mhz
>    The number "599.04" is how to calculate?

This number comes from 9.58464/16.

Regards,
Ben Brown
Chair Logic Track, P802.3ae

-- 
-----------------------------------------
Benjamin Brown
AMCC
2 Commerce Park West
Suite 104 
Bedford NH 03110
603-641-9837 - Work
603-491-0296 - Cell
603-626-7455 - Fax
603-798-4115 - Home Office
bbrown@xxxxxxxx
-----------------------------------------