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*To*: <stds-802-3-hssg@xxxxxxxxxxxxxxxxxx>*Subject*: RE: [802.3ae] WIS test Pattern PRBS Generator Polynomial*From*: "Nepple, Bruce" <bnepple@xxxxxxxxxxxxxxxxxxx>*Date*: Mon, 4 Feb 2002 11:43:14 -0800*Sender*: owner-stds-802-3-hssg@xxxxxxxxxxxxxxxxxx*Thread-Index*: AcGtoo90tWtZBGewSaWu3CO3llVD5gAEImHA*Thread-Topic*: [802.3ae] WIS test Pattern PRBS Generator Polynomial

Ouch --- I missed that comment. Thanks for pointing it out. My issue was that there are MANY 2**23-1 polynomials. Which one specifically is preferred or required was not specified, and there was no comment indicating that the choice was implementation dependent or to be determined in the future. Bruce > -----Original Message----- > From: Tom Alexander [mailto:Tom_Alexander@xxxxxxxxxxxxxx] > Sent: Monday, February 04, 2002 9:36 AM > To: Nepple, Bruce; stds-802-3-hssg@xxxxxxxxxxxxxxxxxx > Subject: RE: [802.3ae] WIS test Pattern PRBS Generator Polynomial > > > Bruce, > > The PRBS for the mixed-frequency test pattern indeed uses a > 2**23 -1 polynomial. This is explicitly described in the WIS > clause (see lines 39-41 and 47-48 of page 397, lines 9-13 of > page 398, and Figure 50-13 (payload field) on page 398). All > these refer to Draft 4.0. > > Note that in the next draft of the WIS spec, there is a new > (optional) additional test pattern introduced, as per the > resolution of Comment #72 against Draft 4.0; this pattern > uses a 2**31 -1 polynomial. > > Thanks, > > - Tom Alexander > WIS Scribe > > > -----Original Message----- > From: Nepple, Bruce [mailto:bnepple@xxxxxxxxxxxxxxxxxxx] > Sent: Friday, February 01, 2002 9:36 PM > To: stds-802-3-hssg@xxxxxxxxxxxxxxxxxx > Subject: [802.3ae] WIS test Pattern PRBS Generator Polynomial > > > I could find no definition of the WIS test Pattern PRBS > generator polynomial in Clause 50 (or any other clause, for > that matter). I did find a reference to O.172 and in O.172 I > found a reference to O.150, and in O.150 I found a definition > for a 2**23 -1 length PRBS. (Section 5.6). Is that the > required generator for WIS? Is there a reason that it is not > specified? Or, did I just manage to overlook it in the > specification? (wouldn't be the first time). > > O.150 Section 5.6 specifies a 23 stage shift register with > taps from stage 23 and stage 18 added (mod-2) and applied to > the first stage. (I'd call it a x**23 + x**18 + 1 generator > with input data = 0, but I'm not a math dude) > > Bruce >

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