[SI-LIST] 回复:Re: Questions about Compliance interconnect magnitude response and ISI loss in XAUI standard
- From: liuluping 41830 <liuluping@xxxxxxxxxx>
- To: Wei Zhou <wzhou@xxxxxxxxxxx>
- Date: Thu, 17 Jan 2008 14:59:45 +0800
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 =
=3E from HUAWEI=2C which is intended only for the person or entity whose =
=3E address is listed above=2E Any use of the information contained =
=3E herein in any way (including=2C but not limited to=2C total or partia=
l =
=3E disclosure=2C reproduction=2C or dissemination) by persons other than=
=
=3E the intended recipient(s) is prohibited=2E If you receive this e-
=3E mail in error=2C please notify the sender by phone or em
=3E ail immediately and delete it!
=3E *****************************************************************
=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
=3E =3E =3E *=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=
=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E*=7E
=3E =3E =3E Bantian=2CLonggang=2CShenzhen 518129 P=2ER=2EC=2E
=3E =3E =3E Tel=3A+86-755-28972154 28780808
=3E =3E =3E Fax=3A+86-755-28978853
=3E =3E =3E E-mail=3Aliuluping=40huawei=2Ecom
=3E =3E =3E URL=3Ahttp=3A//www=2Ehuawei=2Ecom
=3E =3E =3E *************************************************************=
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=3E =3E =3E This e-mail and its attachments contain confidential =
=3E information =
=3E =3E from HUAWEI=2C which is intended only for the person or entity =
=3E whose =
=3E =3E address is listed above=2E Any use of the information contained =
=3E =3E herein in any way (including=2C but not limited to=2C total or =
=3E partial =
=3E =3E disclosure=2C reproduction=2C or dissemination) by persons other =
=3E than =
=3E =3E the intended recipient(s) is prohibited=2E If you receive this e-=
=3E =3E mail in error=2C please notify the sender by phone or em
=3E =3E =3E ail immediately and delete it!
=3E =3E =3E *************************************************************=
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