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Windows1394aBandwidthLimitingIssue/SidSpeedFix(WindowsXP‐Vista)
First,let’sexplainalittleaboutwhattheSidSpeedFixis.Basically,SidSpeedisavalueinyourwindowsregistrythat
regulates the speed of your FireWirebus. It can have a value from 0‐3 (0=S100 speed,1=S200 speed, 2=S4
00
speed,and3=800speed).IfaSidSpeedvaluelargerthan3isused,thenWindowswillrejectthatanduseavalueof
0instead,soit’simportanttouseavalueof0‐3.
Normally,thedefaultvalue forSidSpeedis 2,whichcorrespondstoatransferrateof400mbps(Fir
eWire400).
Thisspeedisstandardformostaudio
interfaces,includingours.Theproblemisthattherearesituationswherethis
valuecanbeloweredto“0”duringanOSupdateandresultinchoppyandunusableperformanceforstreaming
audio.Thisissueseemstohavefirstbeenenco
unteredintheSP2
updateforWindowsXP…
http://support.microsoft.com/kb/885222
…andcamebackagainwiththeXPSP3update.
http://support.microsoft.com/kb/955408/en‐us
We’vealsoseenincorrect(orno)SidSpeedvaluesetinWindowsVista.Sonowthatyouhavesomebackground,
let’swalkthroughafixthatshouldworkregardlessofwhatversionofWindowsyou’reusing.
LoginasAdministratoronyourcomputer(orasaUserthathasAdministratorrights).ClickonStart,andth
enclick
Run.(Fi
gureA.5)
FigureA.5
ThiswillopentheRuncommandbox.Intheentryfield,typethewordregedit(FigureA.6)
FigureA.6