[SI-LIST] Questions about Compliance interconnect magnitude response and ISI loss in XAUI standard
- From: liuluping 41830 <liuluping@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 16 Jan 2008 15:33:10 +0800
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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Bantian,Longgang,Shenzhen 518129 P.R.C.
Tel:+86-755-28972154 28780808
Fax:+86-755-28978853
E-mail:liuluping@xxxxxxxxxx
URL:http://www.huawei.com
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