RE: Link Status thoughts
When the link is down, the XGMII is still operational. Since XAUI is just
an extension of the XGMII I expect it should send what it is told to by the
XGMII.
--Bob Grow
-----Original Message-----
From: Lior Reem [mailto:LReem@xxxxxxxxx]
Sent: Wednesday, November 01, 2000 1:57 AM
To: 'THALER,PAT (A-Roseville,ex1)'
Cc: 'HSSG'
Subject: RE: Link Status thoughts
Pat,
Thanks for the answers.
One more question to complete the picture.
What should the XGXS transmit onto the XAUI interface when the link is down
- the regular data stream, or idle patterns (or other)?
By the way - if /E/ can be transmitted into the XAUI/PCS, then Figure 48-8
should include this case, and hence, the relevant state machine diagrams.
Regards,
Lior.
~~~~~~~~~~~~~~~~~~~
Lior Re'em
Avaya Inc.
Israel
Tel : +972 3 6457608
Email : lreem@xxxxxxxxx
~~~~~~~~~~~~~~~~~~~
> -----Original Message-----
> From: THALER,PAT (A-Roseville,ex1) [SMTP:pat_thaler@xxxxxxxxxxx]
> Sent: ד נובמבר 01 2000 2:03
> To: Lior Reem; 'rtaborek@xxxxxxxxxxxxx'
> Cc: 'HSSG'
> Subject: RE: Link Status thoughts
>
>
> Lior,
>
> /E/ would normally be transmitted when any of the physical sublayers (e.g.
> a PCS or an XGXS) receives bytes that it cannot encode. For instance, if
> a DTE XGXS got a byte from the XGMII that was a control byte but did not
> have a valid control code or if the 10GBASE-X PCS received a byte that
> had a code violation. They are normally caused by bit errors.
>
> Also, if a sublayer receives an /E/, it will transmit an /E/.
>
> The purpose of /E/ is to protect against an error getting turned into
> a valid code that might end up producing a packet with an undetectable
> error.
>
> There are two proposals for break link and remote fault siganlling. The
> 802.3ae task force has not made any decision on the matter yet. By the
> way,
> since
> we have an approved project, the group is no longer called HSSG, High
> Speed Study Group. A study group exists to study what project if any
> should be initiated. Once the project is approved, it isn't a study
> group any more.
>
> 802.3ae has not adopted any objectives for any kind of auto negotiation
> protocol. All the links we have defined will initialize using the
> normal data signals -- no training signals are needed.
>
> Pat Thaler
>
> -----Original Message-----
> From: Lior Reem [mailto:LReem@xxxxxxxxx]
> Sent: Monday, October 30, 2000 7:23 AM
> To: 'rtaborek@xxxxxxxxxxxxx'
> Cc: 'HSSG'
> Subject: RE: Link Status thoughts
>
>
>
> Hi Rich,
>
> 1. Can you explain in which cases /E/ is transmitted onto the XAUI
> interface, and how should the receiver react in these cases?
> 2. Are there any agreements in the HSSG about Remote Fault and Break Link
> signaling?
> 3. Any thoughts about Link Initialization?
>
> These questions are mainly a concern for cross-connect equipment which
> work
> in low levels, but need to supply solutions in broken link cases.
>
> Thanks,
> Lior.
>
>
> ~~~~~~~~~~~~~~~~~~
> Lior Re'em
> Avaya Inc.
> Israel
>
> Tel : +972 3 6457608
> Email : lreem@xxxxxxxxx
> ~~~~~~~~~~~~~~~~~~
>
> > -----Original Message-----
> > From: Rich Taborek [SMTP:rtaborek@xxxxxxxxxxxxx]
> > Sent: ג אוקטובר 31 2000 10:53
> > To: HSSG
> > Subject: Re: Link Status thoughts
> >
> >
> > Isaac,
> >
> > P802.3ae has no Auto-Negotiation objective and Auto-Negotiation was
> > voted down at the September, 2000 meeting. Current P802.3ae definitions
> > set Link Status = OK when the transmitter is operational and the
> > receiver can synchronize to the incoming bit stream and signal detect is
> > OK. Any "close loop" or handshaking of the two simplex links must be
> > initiated at the MAC level or above. This is true for all P802.3ae
> > variants including LAN and WAN and is independent of coding and the
> > presence or absence of any interfaces or extensions.
> >
> > Best Regards,
> > Rich
> >
> > --
> >
> > Isaac Fuchs wrote:
> > >
> > > Hi Rich
> > > As I know from 802.3z link_status is a close loop
> > > information. It's mean that link_status is up only when
> > > both sides transmit and also receive right symbols (c1,c2)
> > > [I know that 802.3z includes also auto_neg.].
> > > Is there in P802.3ae any close loop (LAN application)?
> > > I mean when I transmit after powering on /K/R/.. from XGXS layer how
> > can I
> > > know that the remote receive this information?
> > > Regards
> > > Isaac Fuchs
> >
> > -------------------------------------------------------
> > Richard Taborek Sr. Phone: 408-845-6102
> > Chief Technology Officer Cell: 408-832-3957
> > nSerial Corporation Fax: 408-845-6114
> > 2500-5 Augustine Dr. mailto:rtaborek@xxxxxxxxxxx
> > Santa Clara, CA 95054 http://www.nSerial.com