Hi Wei and Vinu=3A Thank you for your kindly reply =3BMay be my question can be simplifie= d as =3AWhy the Figure 47-6 appears that the greater loss=2Cor the the m= ore negative=2C than the limit line is better=3F We also found a document named =27XAUI Electrical Test Suite V1=2E1=27= from http=3A//www=2Eiol=2Eunh=2Eedu/consortiums/10gec=3BThe setction 47=2E= B=2E3 (Page 22) = talk about this problem too=2EIt explains that the intent of this figure = was to provide a baseline value for the expected =27worst case=27channel=2C= the = limit line can be get by physically measuring the performance of a range = of real =2Cactual interconnects ranging in length from 46 to 56cm=2Cand = taking the median of the observed data=2EChannels with greater loss are a= dditionally considered valid for the purpose of comformance testing=2E = For example=3AS21(Limit)=3D-11=2E4dB(Pout/Pin=3D10=5E(-11=2E4/10)=3D0=2E= 0724) at 3=2E125GHz=2C A valid sample S21=3D-12=2E4dB(Pout/Pin=3D10=5E(-1= 2=2E4/10)=3D0=2E0575) at 3=2E125GHz That was what confused me =3AThe more loss =2Cthe better=2E = Thanks and Regards=2C LIU Luping ***************************************************************** This e-mail and its attachments contain confidential information from HUA= WEI=2C which is intended only for the person or entity whose address is l= isted above=2E Any use of the information contained herein in any way (in= cluding=2C but not limited to=2C total or partial disclosure=2C reproduct= ion=2C or dissemination) by persons other than the intended recipient(s) = is prohibited=2E If you receive this e-mail in error=2C please notify the= sender by phone or em ail immediately and delete it! ***************************************************************** ----- =D4=AD=D3=CA=BC=FE ----- =B7=A2=BC=FE=C8=CB=3A Vinu Arumugham =3Cvinu=40cisco=2Ecom=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 =D6=F7=CC=E2=3A Re=3A =5BSI-LIST=5D Questions about Compliance interconne= ct magnitude response and ISI loss in XAUI standard =3E Luping=2C =3E = =3E It may be useful to define a compliance interconnect as one that = =3E is used for stress testing and a compliant interconnect as one = =3E that would be used in a product=2E A compliant interconnect should = =3E fall above the limit line=2E Compliance interconnects should fall = =3E below the limit line=2E So=2C channels with greater loss (than the = =3E limit line ) are considered valid for stress testing=2E =3E = =3E Thanks=2C =3E Vinu =3E = =3E = =3E = =3E iuluping 41830 wrote=3A =3E =3E Dear SI-listers=3A =3E =3E =3E =3E 802=2E3-2005=5Fsection4 Clause 47=2E4=2E1 and Figure 47-6 spec= ify the = =3E characteristics for a test chanel that is refered to in the clause = =3E as a =22Compliance Interconnect=22=2E =3E =3E The figure gives a S21(limit) line which the transmission = =3E magnitude response =2C=7CS21=7C=2Cof the Compliance Interconnect in d= B = =3E should smaller than it=2E =3E =3E In general=2Cchannel specifications typically provide a limit = =3E line for attenuation=2Cwhich represents the maximum allowed = =3E attenuation value =2C =3E =3E i=2Ee=2Ethe channel attenuation must be less than than the limit = =3E line =2ELosses are usually indicated in dB=2Cand increase positively = =3E along the y-axis =2C =3E =3E However =2Cwe see that this is not the case for Figure 47-6=2EWe = =3E also see that the response for a sample compliance interconnect = =3E is provided on the plot=2C =3E =3E and that this response is below the limit line=2C however the y- =3E axis is labeld in negative dB =2Cwhat does this mean=3FIs it means = =3E that the channel with = =3E =3E greater loss are considered valid =3F =3E =3E =3E =3E Best Regards=2C =3E =3E Luping Liew =3E =3E CAD/SI Engineer =3E =3E Network Interconnect Research Department =3E =3E Huawei Technologies Co=2E=2CLtd=2E =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 Bantian=2CLonggang=2CShenzhen 518129 P=2ER=2EC=2E =3E =3E Tel=3A+86-755-28972154 28780808 =3E =3E Fax=3A+86-755-28978853 =3E =3E E-mail=3Aliuluping=40huawei=2Ecom =3E =3E URL=3Ahttp=3A//www=2Ehuawei=2Ecom =3E =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 =3E ail immediately and delete it! =3E =3E *****************************************************************= =3E =3E =3E =3E =3E =3E -----------------------------------------------------------------= =3E - =3E =3E To unsubscribe from si-list=3A =3E =3E si-list-request=40freelists=2Eorg with =27unsubscribe=27 in the S= ubject = =3E field=3E =3E =3E or to administer your membership from a web page=2C go to=3A =3E =3E http=3A//www=2Efreelists=2Eorg/webpage/si-list =3E =3E =3E =3E For help=3A =3E =3E si-list-request=40freelists=2Eorg with =27help=27 in the Subject = field =3E =3E =3E =3E =3E =3E List technical documents are available at=3A =3E =3E http=3A//www=2Esi-list=2Enet =3E =3E =3E =3E List archives are viewable at=3A = =3E =3E http=3A//www=2Efreelists=2Eorg/archives/si-list =3E =3E or at our remote archives=3A =3E =3E http=3A//groups=2Eyahoo=2Ecom/group/si-list/messages =3E =3E Old (prior to June 6=2C 2001) list archives are viewable at=3A =3E =3E http=3A//www=2Eqsl=2Enet/wb6tpu =3E =3E = =3E =3E =3E =3E =3E =3E = =3E = =3E ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu