Technical Product Manual - DCT1900Maintenance, Fault Signalling3-4 Maint-DCT1900/R8/mw© 2000-2005Before any part of the system is suspected, it should be made clear that no handling faults haveoccurred. Typical handling faults are:z Portable Telephone out–of–range, battery empty or Portable Telephone not switched on.z "Hook flash" set on (if applicable), causing difficulties in going on or off hook.z Audio and ringing volume too low.z "Ringing" switched off.z Improper handling of unit, damage due to dropping or inserting battery improperly.3.5 Common User ComplaintsCommon user complaints are similar complaints received from several users at the same time.Somehow these complaints have a common source and fault finding is based on finding thatcommon aspect:Faults occurring in same area : A Base Station may be suspected.Blocking calls : Lack of resources in SPCs (SPUs and/or SLUs) or air capacity.Lost calls : During an inter system handover calls may get dropped due toan improper PWT air interface synchronization of the systemsinvolved.3.6 Alarms to Mobility Server (DCT1900 Mobility Configuration Only)To inform the MS about its operational state, the DCT1900 system can send the following alarms:Alarm1 : System start–up ready, system is available.Alarm2 : Non serious fault detected.Alarm3 : Serious fault detected. The general alarm signal is raised and aservice message is generated. Also, it is possible that calls arenot handing over to a base station because of improper timedelay values. May relate to "fault occurring in same area."3.7 LEDsLEDs can be found on all system boards and Base Stations. Those LEDs may not and cannot betaken as alarm signalling devices because they are usually out-of-sight. However, sometimes theymay give additional information to maintenance personnel.All system boards have four identical LEDs at the top, except the DTU board which has two rowsof four LEDs. The CPU board is equipped with two extra LEDs. Base Stations have two LEDs. Anexplanation is given of those LEDs below.
