Toshiba Perfecptione Installation And Maintenance Manual

PERCEPTIONea,,Tl/OS-1SEPTEMBER1991channel(s) via dip switches on S3. Hardwarefaults (such as a bad channel) can cause thisto light.2) BSY-Busy indication in one or more chan-nels.3) FALM-NDTU has not achieved Synchroni-zation (see Note 1).4) MFALM-NDTU has not achieved FrameSynchronization (see Note 1).5) YALM-Yellow alarm is detected by NDTU.6) BALM-Blue alarm is detected by NDTU.NOTES:1. Combination of FALM and MFALM is redalarm.2. If any alarms are /it, refer to the Trou-bleshooting flowcharts.YALMMFALM000 00 01FALTBSYBALMFALMFIGUREII-LED POSITIONS3.60 Alarm and Status Conditions3.61 The NDTU PCB is equipped with six LEDs.These LEDs are the indicators for different alarmsand status conditions, that are generated eitherlocally or remotely. The following are the commonlydefined alarm and status conditions in the Ti/DS-1interface. These alarms, LED indications, and LEDdefinitions are also noted in Chapter 4, Paragraph7.00 in the Installation section of the ’PERCEPTlONe&ex installation and Maintenancemanual.1) Red Alarm: The red alarm is generated whena Loss of Signal (LOS) or Out of Frame (OOF)condition has occurred for a period of 2.0 w 3.0seconds. This alarm is identified as a locally-detected error, and it is a combination of theFALM and MFALM alarms.2) Yellow Alarm: The yellow alarm can be iden-tified as a remotely-detected alarm, as follows:l Superframe: When the second bit of eachchannel orthe eighth bit is forced to”ZER0.”YALMMFALMIFALTBSYBALMFALMFIGUREg--RED ALARMYALMMFALM0 FALT0 BSY-:@- 0 BALM0 0 FALMFIGUREg-YELLOW ALARM-8-

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