User's Manual

LTEeNodeBIndoorHardwareInstallationQ-HSO(QuartzHighStabilityOscillator)Replacement
Q-HSO(QuartzHighStabilityOscillator)Replacement
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Q-HSO(QuartzHighStabilityOscillator)Replacement
Objective
Theobjectiveisasfollows:
•RemovetheBCUIIcardcageassemblyfromtheframe
•ReplacetheQ-HSOlocatedontherearpaneloftheBCUIIcardcageassembly
•ReinstalltheBCUIIcardcageassemblyintheframe
Introduction
TheoptionalQ-HSOislocatedontheBCUIIrearpanel(seeFigure8-3).Itismountedinthe
middleoftherearpanelbetweenthefantrayandthePSU.
TheQ-HSOisabackupsynchronizationsourceformaintainingBTSsystemtiming
established/sourcedbyeithertheoptionalRFGPSreceivermodulelocatedinthefrontpanel
doorassembly .
TheQ-HSOcontainsahighstabilityquartzcrystaloscillator .
TheQ-HSOhasa9–pinD-connectorthatconnectstotheMSOconnectorontheBCUIIrear
panel.ThisconnectionallowstheBCUIItosupplyDCpowertotheQ-HSO.Inaddition,
control/datasignalsareexchangedbetweentheBCUIISiteControllercardandtheQ-HSO
throughthisconnection.
TheQ-HSOprovidesa1PulsePerSecond(1PPS)timingsignal.This1PPSsignalisapplied
totheSiteControllercard.
IfGPSsatellitetrackingislostoriftheRFGPSreceivermodulefails,theQ-HSOmaintainsBTS
systemtimingforupto24hours.
Preparation
Requiredtools
ThefollowingtoolsarerequiredtoremoveandinstallaQ-HSO:
•T20TORXbit
•Torquedriver
68P09308A55-68-17
FEB2010