RE: [10GBASE-CX4] S-param characterization of the cable

["Nadolny, Jim" <JNadolny@fciconnect.com>]

Gary,

Using the 4 port VNA from Agilent we have ports 1 and 2 as inputs and ports
4 and 3 as outputs.  The through measurements are 1 to 4 and 2 to 3.  The
mode conversion equations built into the Agilent software assume this
configuration when it derives the mixed mode S-parameters.  Using this
instrument it is most efficient to simply follow their convention.

We can re-map the ports so that a more academic (and logical) convention is
followed.  In data that I provide I try to define the port convention so
that the user can re-map if they want to.  This requires the user to
actually read the comments in the Touchstone file to understand the
convention.  I have seen other mappings as well (1 and 2 are inputs and 3
and 4 are outputs, S13 and S24 are the through connections) so until a
standard is applied, I will include a port description in the comment line.

Dan - For 10 GBE work it would make sense to mandate a standard port
mapping.  The 1-2-4-3 mapping is easiest for me but the 1-3-2-4 or 1-2-3-4
are more logical.

regards,
Jim N

-----Original Message-----
From: Oleynick, Gary 
Sent: Wednesday, June 18, 2003 11:20 AM
To: 'Zhi Wong'; DOVE,DANIEL J (HP-Roseville,ex1); Liu, Howard; Oleynick,
Gary; 10GBASE-CX4 (E-mail); Nadolny, Jim
Subject: RE: [10GBASE-CX4] S-param characterization of the cable


Jim,

How should we respond to this request?

Gary 

-----Original Message-----
From: Zhi Wong [mailto:zwong@altera.com]
Sent: Tuesday, June 17, 2003 8:43 PM
To: DOVE,DANIEL J (HP-Roseville,ex1); Liu, Howard; Oleynick, Gary;
10GBASE-CX4 (E-mail)
Subject: RE: [10GBASE-CX4] S-param characterization of the cable


Dan/Howard/Gary,

I would suggest taking 4-port S-Parameter measurements.
(Ports 1 and 3 on the left of the network)
(Ports 2 and 4 on the right of the network)

This would be consistent with some OIF standards like CEI and XFP.

Zhi
Altera Corporation
San Jose, CA
USA

-----Original Message-----
From: DOVE,DANIEL J (HP-Roseville,ex1) [mailto:dan.dove@hp.com] 
Sent: Tuesday, June 17, 2003 4:45 PM
To: 'Liu, Howard'; 'Oleynick, Gary'; 10GBASE-CX4 (E-mail)
Subject: RE: [10GBASE-CX4] S-param characterization of the cable



Hello,

For those who are observing this conversation, the data Gary sent
exceeded the 100K maximum size limit for the reflector. As a result,
only those directly addressed received the file.

Regards,

Dan Dove
Chair, 802.3ak


> -----Original Message-----
> From: Liu, Howard [mailto:howard.liu@ti.com]
> Sent: Tuesday, June 17, 2003 4:26 PM
> To: 'Oleynick, Gary'; 10GBASE-CX4 (E-mail)
> Subject: RE: [10GBASE-CX4] S-param characterization of the cable
> 
> 
> 
> Gary,
> This is a complete measurement, the format is good, I can
> convert single
> ended data to differential data. Do you have the rest of the 
> measurements.
> This is for the test fixture only.
> 
> Thanks!
> 
> howard liu
> 
> 
> -----Original Message-----
> From: Oleynick, Gary [mailto:GOleynick@fciconnect.com]
> Sent: Tuesday, June 17, 2003 6:16 PM
> To: Liu, Howard; Oleynick, Gary; 10GBASE-CX4 (E-mail)
> Subject: RE: [10GBASE-CX4] S-param characterization of the cable
> 
> 
> Howard,
> 
> Does this help?
> 
> Gary
> 
> 
> 
> -----Original Message-----
> From: Liu, Howard [mailto:howard.liu@ti.com]
> Sent: Tuesday, June 17, 2003 4:08 PM
> To: 'Oleynick, Gary'; 10GBASE-CX4 (E-mail)
> Subject: RE: [10GBASE-CX4] S-param characterization of the cable
> 
> 
> Gary,
> Thanks again, I looked into the files, looks like that it only has the

> amplitude measurements in dBs, I need its phase measurements too if 
> you have them.
> 
> Thanks!
> 
> howard
> 
> 
> -----Original Message-----
> From: Oleynick, Gary [mailto:GOleynick@fciconnect.com]
> Sent: Tuesday, June 17, 2003 5:02 PM
> To: Liu, Howard; 'DOVE,DANIEL J (HP-Roseville,ex1)'; 10GBASE-CX4
> (E-mail)
> Cc: Oleynick, Gary
> Subject: RE: [10GBASE-CX4] S-param characterization of the cable
> 
> 
> Howard,
> 
> Attached is FCI's S-parameter data on the 10 and 15 meter
> cable assembly
> lengths.
> 
> Regards,
> 
> Gary
> 
> 
> 
> -----Original Message-----
> From: Liu, Howard [mailto:howard.liu@ti.com]
> Sent: Tuesday, June 17, 2003 2:31 PM
> To: 'DOVE,DANIEL J (HP-Roseville,ex1)'; 10GBASE-CX4 (E-mail)
> Subject: [10GBASE-CX4] S-param characterization of the cable
> 
> 
> 
> 
> Hi,
> Do we have an exist measurement of the channel (cable) from 
> TP1 to TP4 with
> FEXT and NEXT included? It can be in any format. 
> 
> Thanks!
> 
> 
> Howard Liu
> 
> Texas Intruments
> 214 480 7678
>