RE: [10GBASE-CX4] Cable / Connector pinout
Pat,
I understood and agree with you.
Thanks,
- Horie
> -----Original Message-----
> From: owner-stds-802-3-10gbcx4@majordomo.ieee.org
> [mailto:owner-stds-802-3-10gbcx4@majordomo.ieee.org]On Behalf
> Of pat_thaler@agilent.com
> Sent: Tuesday, December 10, 2002 1:26 PM
> To: horie@fla.fujitsu.com; stds-802-3-10GBCX4@ieee.org
> Subject: RE: [10GBASE-CX4] Cable / Connector pinout
>
>
>
> Horie,
>
> The pin out reflects the way the wires run in the cable. For
> Infiniband cable, the cable includes a "crossover" so that
> both ends have the same connector pin out. For example, S1 on
> one end of the cable is wired to S16 on the other end so that
> one ends RX0+ connects to the other ends TX0+.
>
> If one uses the pinout you suggest, the two ends of the cable
> have to have different signal assignments (as in Ethernet
> 10BASE-T MDI and MDI-X connector pin definitions). For
> 10BASE-T, this wasn't a big deal as there are only four pins
> so it is pretty easy to swap pins where needed with an
> MDI/MDI-X switch. For 16 bits and 3+ GigaBaud signal rate,
> this isn't convenient and one should stick to having both ends
> use the same pinout.
>
> Pat
>
> -----Original Message-----
> From: Takeshi Horie [mailto:horie@fla.fujitsu.com]
> Sent: Tuesday, December 10, 2002 12:31 PM
> To: 10GBASE-CX4 (E-mail)
> Subject: RE: [10GBASE-CX4] Cable / Connector pinout
>
>
>
> Dan,
>
> I thought we dont have to follow IB pinout definition,
> although IB cable
> is used. Do I miss something?
>
> Better way is to have pinout order consistent with XENPAK so that one
> SERDES chip can be connected to CX4 and XENPAK only with minor trance
> change.
>
> How about the following pin assignment?
>
> IB 4X connector
> ------------------------
> IB Pin Signal
> ------------------------
> S16 TX3-
> S15 TX3+
> S14 TX2-
> S13 TX2+
> S12 TX1-
> S11 TX1+
> S10 TX0-
> S9 TX0+
> S8 RX3-
> S7 RX3+
> S6 RX2-
> S5 RX2+
> S4 RX1-
> S3 RX1+
> S2 RX0-
> S1 RX0+
> ------------------------
>
> TX*=IBtxO*
> RX*=IBtxI
>
> Thanks,
>
> - Horie, Fujitsu Laboratories of America
>
> > -----Original Message-----
> > From: owner-stds-802-3-10gbcx4@majordomo.ieee.org
> > [mailto:owner-stds-802-3-10gbcx4@majordomo.ieee.org]On Behalf
> > Of Howard A. Baumer
> > Sent: Tuesday, December 10, 2002 10:11 AM
> > To: 10GBASE-CX4 (E-mail)
> > Subject: Re: [10GBASE-CX4] Cable / Connector pinout
> >
> >
> >
> > Dan,
> > I have Vol 1, Rev 1a and Vol 2, Rev 1. I didn't have
> > Vol2, Rev 1a.
> > After looking at Vol 2, Rev 1a all is fine and the cables match the
> > spec.
> >
> > Thanks,
> > Howard
> >
> >
> > "DOVE,DANIEL J (HP-Roseville,ex1)" wrote:
> > >
> > > Hi Howard,
> > >
> > > I am looking at the spec and find that the
> > > cable signals are consistent with my draft
> > > and your stated IB Signal is different.
> > >
> > > The document I hold, Volume2 rev 1.0a has
> > > change bars on those signals as if they were
> > > the most recent change.
> > >
> > > This suggests you *may* be looking at an old
> > > draft. (please oh please oh please!!)
> > >
> > > Can someone more familiar with this matter
> > > please reply to this?
> > >
> > > Thanks,
> > >
> > > Dan
> > >
> > > -----Original Message-----
> > > From: Howard A. Baumer [mailto:hbaumer@broadcom.com]
> > > Sent: Tuesday, December 10, 2002 8:44 AM
> > > To: 10GBASE-CX4 (E-mail)
> > > Subject: [10GBASE-CX4] Cable / Connector pinout
> > >
> > > All,
> > > I just noticed that the connections for the Cable
> > assemblies we have
> > > been dealing with do not match the connections in the IB
> > specification.
> > > Here is what I have determined:
> > > IB IB Cable
> > > Pin Signal Signal Difference
> > > S1 IBtxIp(3) IBtxIp(0) X
> > > S2 IBtxIn(3) IBtxIn(0) X
> > > S3 IBtxIp(2) IBtxIp(1) X
> > > S4 IBtxIn(2) IBtxIn(1) X
> > > S5 IBtxIp(1) IBtxIp(2) X
> > > S6 IBtxIn(1) IBtxIn(2) X
> > > S7 IBtxIp(0) IBtxIp(3) X
> > > S8 IBtxIn(0) IBtxIn(3) X
> > > S9 IBtxOn(3) IBtxOn(3)
> > > S10 IBtxOp(3) IBtxOp(3)
> > > S11 IBtxOn(2) IBtxOn(2)
> > > S12 IBtxOp(2) IBtxOp(2)
> > > S13 IBtxOn(1) IBtxOn(1)
> > > S14 IBtxOp(1) IBtxOp(1)
> > > S15 IBtxOn(0) IBtxOn(0)
> > > S16 IBtxOp(0) IBtxOp(0)
> > >
> > > The Cables IBtxI lane order is reversed from the IB
> > Specification. I am
> > > looking at "InfiniBand Architecture Release 1.0 Volume 2 - Physical
> > > Specifications" page 160 & 161, table 24.
> > >
> > > Howard Baumer
> >
> >
>