[SI-LIST] Re: Return loss and S11 parameter
- From: "Istvan NOVAK" <istvan.novak@xxxxxxxxxxxxxxxx>
- To: <SCAUNEAU@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 23 Jan 2004 08:26:39 -0500
Stephane,
It probably would have been less confusing to use the same
parameter for both specification items, but as Bart suspected,
this difference can be explained by the different frequency
ranges involved.
The 270Mb/s transmission rate comes with a bit rate
frequency of 135MHz, and this octave lower upper
frequency comes with a 2dB tighter requirement.
Regards,
Istvan Novak
SUN Microsystems
----- Original Message -----
From: "Stephane Cauneau" <SCAUNEAU@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Friday, January 23, 2004 6:51 AM
Subject: [SI-LIST] Return loss and S11 parameter
> All,
>
> I've got a general question about return loss.
> The DVB-ASI (serial link over copper coaxial cable @ 270Mb/s)
> specification states that:
>
> 1 - Minimum discrete connector return loss (5Mhz to 270MHz) needs to be
> < -15dB
> 2 - S11 (range 0.1 to 1.0x bit rate) needs to be < -17dB
>
> I don't really understand the difference between return loss and s11. I
> thought it was the same thing.
> Could anyone help me on this one ?
>
> Regards,
>
> Stephane Cauneau
> Member of Technical Staff
> System Solutions Group
> Altera European Technology Centre
> Holmers Farm Way
> High Wycombe
> Buckinghamshire
> HP12 4XF
> United Kingdom
> Phone: +44 (0) 1494 602312
> Fax: +44 (0) 1494 602301
> email: scauneau@xxxxxxxxxx
> http://www.altera.com
>
>
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