Pulse-Eight neo:X+ - Page 27

HDBASET
TM
LINKQUALITYTEST
TheHDBaseTLinkQualityTestwillchecktoseetheHDBaseTlinkisstableoverasustainedperiodof
time.Therearetwodropdownmenus,thefirstistheoutputyouaretestingthesecondisthetypeoftest
youaredoing.
TheMeanSquareErrortestistheratio(indB)ofthesignalpowerofthe'Good'signaltothatofthe
'Bad'signalandisanalogue.Thisisanalogueandisdirectlyaffectedbykinks,termination&othercable
issues.EachChannelhasacolourthatrepresentsthesamecolourinthetwistedpairintheCatcable.
AllfouroftheseChannelsshouldbewithin3dB'sofeachother,forexample,-21dB.-20dB.-21dB&-
19dB.Otherwise,thecablequalitywillbemarkedas"Poor".AllfouroftheseChannelsshouldalsobe
belowthe-15dBline.Otherwise,thecablequalitywillbemarkedas"Poor".
IfaChannelisspikingto0ortowards-40dBortheotherabovecriteriaarebrokenbutthentheyrecover
tonormalthiscanstillindicateanissueandwewillrememberthisandmarkthecableas"Poor".This
canexplainifyourcablesmeettheabovecriteriabutarestillmarkedas"Poor"duetothisspikingonly
happeningafterafewhoursforafewsecondsforexample.
TheChannelErrorstestisameasurementofthenumberoferrorsonthechannel,forexample,packet
lossandbiterrors.Thisisdigitalandisdirectlyaffectedbythesameissuesmentionedinthe"Mean
SquareError"test.AsyoucanseeintheKeyeachChannelhasacolourthatrepresentsthesame
colourinthetwistedpairintheCatcable.AllfouroftheseChannelsshouldbewithin3ofeachother,for
example,35.36.35.34.Otherwise,thecablequalitywillbemarkedas"Poor".Allfourofthese
Channelsshouldalsobebelowthe40-line.Otherwise,thecablequalitywillbemarkedas"Poor".
IfaChannelisspikingto0ortowards60ortheotherabovecriteriaarebrokenbutthentheyrecoverto
normalthiscanstillindicateanissueandwewillrememberthisandmarkthecableas"Poor".Thiscan
explainifyourcablesmeettheabovecriteriabutarestillmarkedas"Poor"duetothisspikingonly
happeningafterafewhoursforafewsecondsforexample.