RE: Serial PMA/PMD delay limits
The delay value that was in the table for Serial PMD was intended to include
the delay of the Serial PMD plus the Serial PMA because we didn't see any
reason to separate it into two numbers. It isn't the Serial PHY delay
because the PCS (and WIS) are part of the PHY and they have their own
separate delay values. The label in the sublayer column could be changed to
"Serial PMA and PMD" which would be consistant with the way other
multi-sublayer entries are done.
The intent was that the table in clause 44 just provide a summary of the
delays. There should have a subclause specifying the delay for the sublayer
in each appropriate clause. For instance, see 49.2.15 and 48.5.1.
Regards,
Pat
-----Original Message-----
From: DAWE,PIERS (A-England,ex1)
Sent: Thursday, March 29, 2001 5:14 AM
To: '802.3ae Serial'; 'Jscquake@aol.com'; 'Eric Grann'; 'David Kabal
(Picolight)'
Cc: THALER,PAT (A-Roseville,ex1)
Subject: Serial PMA/PMD delay limits
Serial PMD-ers,
You may not have noticed a criterion for the PMA or PMD hiding in clause 44,
which isn't helpful!
We need to air this (delay maximum) in the PMD tracks and add
cross-references in clauses 51, 52 and 54.
As to table 44-2, saying that "Serial PMD ... Includes serial PMA and PMD,
..." is wrong, surely? Should that read "Serial PHY ... Includes serial PMA
and PMD, ..." ?
Piers
> -----Original Message-----
> From: pat_thaler@agilent.com [mailto:pat_thaler@agilent.com]
> Sent: 27 March 2001 21:51
> To: boazs@mysticom.com; stds-802-3-hssg@ieee.org
> Subject: RE: Clause 48 Questions
>
>
> Boaz,
>
> There is a difference between the delay specified in prior
> drafts which was
> for MDI to XGMII and the delay specified here which is only
> the delay of a
> single PCS or a single XGXS. The old delay therefore included
> the PMD delay
> which now has a separate 512 bits round trip allocated. ....