[SI-LIST] Re: Questions about Compliance interconnect magnitude response and ISI loss in XAUI standard
- From: Vinu Arumugham <vinu@xxxxxxxxx>
- To: liuluping@xxxxxxxxxx
- Date: Wed, 16 Jan 2008 09:41:33 -0800
Luping,
It may be useful to define a compliance interconnect as one that is used for
stress testing and a compliant interconnect as one that would be used in a
product. A compliant interconnect should fall above the limit line. Compliance
interconnects should fall below the limit line. So, channels with greater loss
(than the limit line ) are considered valid for stress testing.
Thanks,
Vinu
iuluping 41830 wrote:
> Dear SI-listers:
>
> 802.3-2005_section4 Clause 47.4.1 and Figure 47-6 specify the
> characteristics for a test chanel that is refered to in the clause as a
> "Compliance Interconnect".
> The figure gives a S21(limit) line which the transmission magnitude response
> ,|S21|,of the Compliance Interconnect in dB should smaller than it.
> In general,channel specifications typically provide a limit line for
> attenuation,which represents the maximum allowed attenuation value ,
> i.e.the channel attenuation must be less than than the limit line .Losses are
> usually indicated in dB,and increase positively along the y-axis ,
> However ,we see that this is not the case for Figure 47-6.We also see that
> the response for a sample compliance interconnect is provided on the plot,
> and that this response is below the limit line, however the y-axis is labeld
> in negative dB ,what does this mean?Is it means that the channel with
> greater loss are considered valid ?
>
> Best Regards,
> Luping Liew
> CAD/SI Engineer
> Network Interconnect Research Department
> Huawei Technologies Co.,Ltd.
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