Re: Question on the Maximum number of packets per second
Before the St Louis clock vote, a "box vendor" could have the
system provide clocking for all of the PHYs, LAN and WAN, as well as the
rest of the system. In that case, no inter-clock-domain
compensation was required.
If the system clock is at +100PPM and the WIS is at +20PPM,
there are two separate, independent, clock domains now operating between
the MAC Client and the PHY. That will require some form of
compensation. The alternative is to require the "box
vendor" to have a +20PPM clock, which is now an
implementation specification issue.
At 04:02 PM 6/4/01 -0400, Tim Warland wrote:
Roy Bynum wrote:
> Where, in the resolution that was passed in St Louis, was
> compensation added to the rate adaptation to compensate for a system
> running at +100PPM and a transmitter with another clock operating
> +20PPM? That is a total compensation delta between the MAC
> the WIS of 120PPM. From what I understand, the current rate
> scheme was based on the system clock and the WIS clock being the
Under the resolution from St. Louis, there was no added
The system clock is still required to provide 10.000 Gb/s +/-
while the transmit clock in WIS mode operates at 9.95328 Gb/s
If anything the compensation is simplified since there is now a
range of frequency extremes within which to perform compensation.
Tim Warland P.Eng.
Hardware Design Engineer Broadband Products
High Performance Optical Component Solutions