Motorola DCT1800 installation manual Snr, Good, Fair, Poor

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DiagnosticsB-9

Field	Description
SNR	Displays an estimate of the carrier signal-to-noise ratio. The SNR displayed is a
	measure of the QAM cluster variance, which is proportional to the SNR.
	Analog channels display analog for carrier lock. The SNR displays a number for
	the numeric value and blank for the ssss value.
	The following variables can display:
	Blank	The digital section is still in the initial state. If this occurs,
		check diagnostic d07.
	GOOD	Good value
	FAIR	Marginal signal level − check the signal
	POOR	Unusable signal
Modulation Mode	Indicates the modulation modes for analog and digital channels with the
	following variables:
	Channels	Modulation Mode
	Analog channels	Analog
	Digital channels	QAM 64
		QAM 256
Short Term Error Count	Indicates the FEC errors (maximum count of 65535) at 5-second intervals. The
	Short Term Error Count is cleared after polling.
Long Term Error Count	Indicates the accumulation of the Short Term Error Count (maximum count of
	65535). The Long Term Error Count is cleared every 24 hours.
Tuned Frequency	Indicates the actual frequency the tuner is programmed (Carrier Definition
	Frequency + 1.75 MHz).

DCT1800 Installation Manual

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Contents Installation Manual DCT1800 Page Page Contents Troubleshooting SpecificationsDiagnostics Abbreviations and AcronymsFigures Tables Introduction DCT1800 advanced set-topUsing This Manual Related DocumentationDocument Conventions If You Need Help Calling for RepairsOverview Front PanelDCT1800 front panel Rear Panel KeyItemFunction DCT1800 rear panelRemote Controls Motorola universal remote controlKeyItemDescription Installing Batteries in Remote Control Back view of remote controlInstallation Installing the DCT1800Before You Begin Standard Cabling Diagram Standard cablingStandard VCR Cabling Diagram Standard VCR cablingComposite Baseband Cabling Diagrams Standard baseband cablingComposite VCR cabling Stereo Cabling Diagram Baseband Audio through the VCRAudio through VCR/audio output on TV Receiver Cabling Diagrams Audio through A/V ReceiverFeature Testing Procedure Operational CheckCold Initialization Troubleshooting ProblemPossible Solution Specifications Power dissipation WeightAc voltage Surge protectionDiagnostics Accessing DiagnosticsNavigating the Diagnostics CH/CUR +Cursor UP Cursor Down Cursor RightGeneral Status Figure B-2 DCT1800 StatusField Description Initialization Status Errors Code Flash Sequence Out-of-Band OOB Status YESEMM FIXCUR Freq LKCTable B-5 In-band Diagnostic Fields Data Activity IndicatorEMM Data Indicator In-band StatusSNR GoodFair PoorAudio/Video Status Status DescriptionUnit Address Table B-7 Unit Address FieldsDCT1800 Unit Address Network AddressFirmware Version Multicast 16 AddressSeed Health Current Channel Status Figure B-8 Current Channel StatusAuthorization ServiceTable B-8 Current Channel Status Fields TypeOSD Variable State Table B-9 Current Channel Status VariablesRenewable Security System Table B-10 Renewable Security FieldsTvpc Required / Not Required CryptoUpstream Modem Starvue II Diagnostics EnabledDisabled IppvApplication APP Code Modules Table B-12 APP Code Modules FieldsModule Memory Status Interactive Info Table B-14 Interactive Info FieldsUPM Upstream IDMAC Frequency Table Message Types In-band Program Association Table PAT In-band Program Map Table PMTTask Status In-band Multicast Address Filter Keyboard / LED Diagnostics Figure B-20 Keyboard / LED DiagnosticsMgbi