From owner-stds-802-3-hssg@ieee.org Tue Feb 29 00:03 GMT 2000 Received: from gatekeeper.pdd.3com.com (gatekeeper [161.71.169.3]) by isolan.pdd.3com.com (8.9.1b+Sun/8.9.3) with ESMTP id AAA11254; Tue, 29 Feb 2000 00:03:43 GMT Received: from ruebert.ieee.org ([199.172.136.3]) by gatekeeper.pdd.3com.com (Netscape Messaging Server 3.6) with ESMTP id AAA8D1; Tue, 29 Feb 2000 00:02:03 +0000 Received: by ruebert.ieee.org (8.9.3/8.9.3) id SAA14829; Mon, 28 Feb 2000 18:19:20 -0500 (EST) Message-Id: <4.2.0.58.20000228151429.00a77ac0@mail.bayarea.net> X-Sender: jmw@mail.bayarea.net (Unverified) X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.0.58 Date: Mon, 28 Feb 2000 15:19:01 -0800 To: "Edward Chang" , , From: jmw Subject: RE: PAM-5 at 5 Gbaud In-Reply-To: References: <4.2.0.58.20000228133557.00ac6f00@mail.bayarea.net> Mime-Version: 1.0 Sender: owner-stds-802-3-hssg@ieee.org Precedence: bulk X-Resent-To: Multiple Recipients X-Listname: stds-802-3-hssg X-Info: [Un]Subscribe requests to majordomo@majordomo.ieee.org X-Moderator-Address: stds-802-3-hssg-approval@majordomo.ieee.org X-Lines: 83 Status: RO Content-Type: text/plain; charset="us-ascii" Content-Length: 2682 Edward: it seems i don't have a copy of that one anywhere, and in any event it's likely better to let Oscar comment on results. i also looked in the reflector archive and didn't find a copy in the 'January' directory. meanwhile i'd like to see a copy, can someone forward one to me or forward a link? thanks in advance. -- J M Wincn Cielo Communications, Inc. 325 Interlocken Pkwy, Bldg A Broomfield, CO 80021-3497 mwincn@cieloinc.com Voice: 303-464-2264 Cell: 408-394-5283 At 05:11 PM 28-02-2000 -0500, Edward Chang wrote: >Mike: > >The presentation I am referring is page 8 (sorry not pager 7), of "10 >Gb/sPMD Using PAM-5 Modulation" by Oscar in January. > > >Regards, > >Edward S. Chang >NetWorth Technologies, Inc. >EChang@NetWorthtech.com >Tel: (610)292-2870 >Fax: (610)292-2872 > >-----Original Message----- >From: jmw [mailto:mwincn@cieloinc.com] >Sent: Monday, February 28, 2000 4:43 PM >To: Edward Chang; rtaborek@nSerial.com; stds-802-3-hssg@ieee.org >Subject: RE: PAM-5 at 5 Gbaud > > >Ed: > >Perhaps i can help with this, Rich and i were at the same place when >the early MAS tutorials were presented: > >At 02:20 PM 28-02-2000 -0500, Edward Chang wrote: > >Richard: > >The 5 GBaud, PAM-5 waveform at page 7 makes me very uncomfortable. For > >example, the one in the middle has three transitions, of which the > >peak-to-peak amplitudes are 2250 unit(mv?), 1300 unit (mv?), and 1000 > >unit(mv?) with estimated transition times, (0%-100%)65 ps, 60 ps, and 60 >ps, > >respectively. For a five level coding, they seems to match with the +2, +1, > >0, -1, -2 level definition with equally spaced timing interval. > > > >If they are not part of the coding, but a ringing or some other noise, they > >will confuse the level and timing detecting circuits to cause undesirable > >results. If it is supposed to have only one transition per a cell time, >200 > >ps, then those extra transitions will cause the PLL being out of > >synchronization with the receiving data, or excessive clock-jitter to >induce > >high BER. With the near equal magnitude of amplitudes, and timing > >intervals, no way a ordinary filter can differentiate the needed transition > >from the unwanted transitions. > >which presentation do you have? i looked at the links posted earlier >("mastut.pdf"), but "page 7" in those that i saw was text, not wave forms. >is there some other one that i missed? > > >One way or the other, these issues should be resolved before July decision > >date. > >you betcha! >-- > >J M Wincn > >Cielo Communications, Inc. > >325 Interlocken Pkwy, Bldg A > >Broomfield, CO 80021-3497 > >mwincn@cieloinc.com > >Voice: 303-464-2264 > >Cell: 408-394-5283