[SI-LIST] 回复:Re: Questions about Compliance interconnect magnitude response and ISI loss in XAUI standard

Wei=3A

    Thank you=2CI think I misunderstand the figure=2Cit is a limit for te=
st channel which used =

for qualify the active circuit=2EI should read your first reply more care=
fully=2E

 Vinu=3A
    Sorry for disturb you again=2CI should pay more attention to the diff=
erence between the =

=27compliant=27and =27compliance=27in your last reply=2E

Thanks  and Regards=2C

             LIU Luping
    =



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----- =D4=AD=D3=CA=BC=FE -----
=B7=A2=BC=FE=C8=CB=3A Wei Zhou =3Cwzhou=40marvell=2Ecom=3E
=C8=D5=C6=DA=3A =D0=C7=C6=DA=CB=C4=2C =D2=BB=D4=C2 17=C8=D5=2C 2008 =CF=C2=
=CE=E712=3A19
=D6=F7=CC=E2=3A Re=3A =5BSI-LIST=5D Questions about Compliance interconne=
ct magnitude response and ISI loss in XAUI standard

=3E =

=3E =

=3E Luping=2C
=3E =

=3E When the channel is used as a vehicle to qualify silicon=2C a worse =

=3E channel is more desired=2E For the compliance testing=2C the point is=
 =

=3E to test the silicon=2C not the channel itself=2E You want to use a =

=3E worse channel to perform the test=2E =

=3E =

=3E Regards=2C
=3E =

=3E Wei
=3E =

=3E -----Original Message-----
=3E From=3A liuluping 41830 =5Bmailto=3Aliuluping=40huawei=2Ecom=5D
=3E Sent=3A 2008-1-16  19=3A06
=3E To=3A Vinu Arumugham=3B Wei Zhou
=3E Cc=3A si-list=40freelists=2Eorg=3B oukanghua=40huawei=2Ecom
=3E Subject=3A Re=3A =5BSI-LIST=5D Questions about Compliance interconnec=
t =

=3E magnitude response and ISI loss in XAUI standard
=3E =

=3E =

=3E =

=3E Hi Wei and Vinu=3A
=3E =

=3E   Thank you for your kindly reply =3BMay be my question can be =

=3E simplified as =3AWhy the Figure 47-6 appears that the greater =

=3E loss=2Cor  the the more
=3E negative=2C than the limit line is better=3F
=3E =

=3E   We also found a document named =27XAUI Electrical Test Suite =

=3E V1=2E1=27 from http=3A//www=2Eiol=2Eunh=2Eedu/consortiums/10gec=3BThe=
 setction =

=3E 47=2EB=2E3 (Page 22) =

=3E talk about this problem too=2EIt explains that the intent of this =

=3E figure was to provide a baseline value for the expected =27worst =

=3E case=27channel=2Cthe =

=3E limit line can be get by physically measuring the performance of a =

=3E range of real =2Cactual interconnects ranging in length from 46 to =

=3E 56cm=2Cand =

=3E taking the median of the observed data=2EChannels with greater loss =

=3E are additionally considered valid for the purpose of comformance =

=3E testing=2E  =

=3E   For example=3AS21(Limit)=3D-11=2E4dB(Pout/Pin=3D10=5E(-11=2E4/10)=3D=
0=2E0724) =

=3E at 3=2E125GHz=2C A valid sample S21=3D-12=2E4dB(Pout/Pin=3D10=5E(-
=3E 12=2E4/10)=3D0=2E0575) at 3=2E125GHz
=3E =

=3E  That was what confused me =3AThe more loss =2Cthe  better=2E =

=3E =

=3E Thanks and Regards=2C
=3E =

=3E                         LIU Luping
=3E =

=3E *****************************************************************
=3E This e-mail and its attachments contain confidential information =

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=3E herein in any way (including=2C but not limited to=2C total or partia=
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 =

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=3E mail in error=2C please notify the sender by phone or em
=3E ail immediately and delete it!
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=3E =

=3E =

=3E =

=3E ----- =D4=AD=D3=CA=BC=FE -----
=3E =B7=A2=BC=FE=C8=CB=3A Vinu Arumugham =3Cvinu=40cisco=2Ecom=3E
=3E =C8=D5=C6=DA=3A =D0=C7=C6=DA=CB=C4=2C =D2=BB=D4=C2 17=C8=D5=2C 2008 =C9=
=CF=CE=E71=3A41
=3E =D6=F7=CC=E2=3A Re=3A =5BSI-LIST=5D Questions about Compliance interc=
onnect =

=3E magnitude response and ISI loss in XAUI standard
=3E =

=3E =3E Luping=2C
=3E =3E =

=3E =3E It may be useful to define a compliance interconnect as one that =

=3E =3E is used for stress testing and a compliant interconnect as one =

=3E =3E that would be used in a product=2E A compliant interconnect shoul=
d =

=3E =3E fall above the limit line=2E Compliance interconnects should fall=
 =

=3E =3E below the limit line=2E So=2C channels with greater loss (than th=
e =

=3E =3E limit line ) are considered valid for stress testing=2E
=3E =3E =

=3E =3E Thanks=2C
=3E =3E Vinu
=3E =3E =

=3E =3E =

=3E =3E =

=3E =3E iuluping 41830 wrote=3A
=3E =3E =3E Dear  SI-listers=3A
=3E =3E =3E
=3E =3E =3E    802=2E3-2005=5Fsection4 Clause 47=2E4=2E1 and Figure 47-6 =
specify =

=3E the =

=3E =3E characteristics for a test chanel that is refered to in the =

=3E clause =

=3E =3E as a =22Compliance Interconnect=22=2E
=3E =3E =3E The figure gives a S21(limit) line which the transmission =

=3E =3E magnitude response =2C=7CS21=7C=2Cof the Compliance Interconnect =
in dB =

=3E =3E should smaller than it=2E
=3E =3E =3E In general=2Cchannel specifications typically provide  a limi=
t =

=3E =3E line for attenuation=2Cwhich represents the maximum allowed =

=3E =3E attenuation value =2C
=3E =3E =3E i=2Ee=2Ethe channel attenuation must be less than than the li=
mit =

=3E =3E line =2ELosses are usually indicated in dB=2Cand increase positiv=
ely =

=3E =3E along the y-axis =2C
=3E =3E =3E However =2Cwe see that this is not the case for Figure 47-6=2E=
We =

=3E =3E also see that the response for a  sample compliance interconnect =

=3E =3E is provided on the plot=2C
=3E =3E =3E and that this response is below the limit line=2C however the=
 y-
=3E =3E axis is labeld in negative dB =2Cwhat does this mean=3FIs it mean=
s =

=3E =3E that the channel with =

=3E =3E =3E greater loss are considered valid =3F
=3E =3E =3E
=3E =3E =3E Best Regards=2C
=3E =3E =3E Luping Liew
=3E =3E =3E CAD/SI Engineer
=3E =3E =3E Network Interconnect Research Department
=3E =3E =3E Huawei Technologies Co=2E=2CLtd=2E
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=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E
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=3E =3E =3E *************************************************************=
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