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10 Diagnostics
DCT 2000 Installation Manual
PCR Lock OSD Only
The PCR lock indicates a program-clock-reference lock with the current digital datastream.
Signal-To-Noise Ratio (SNR) and Automatic Gain Control (AGC) OSD Only
The SNR displayed on the OSD i s a rough estimate of t he carrier signal-to-noise ratio. The
SNR displayed is a measure of the QAM cluster variance, which is proportional t o the
signal-to-noise ratio.
The AGC value roughly indicates the received signal level.
Analog channels display
analog
for carrier lock. The SNR and AGC display a number for the
numeric value and blank for the ssss value. A blank display indicates that the digital section of
the DCT 2000 is still in the initial state. If this occurs, check diagnostic d07.
Table B-9 lists the SNR and AGC indicators for the OSD:
Table B-9
SNR and AGC indicators OSD only
ssss value Meaning
GOOD
Good value
FAIR
Marginal signal level
check the signal
BAD
Unusable signal
d 04: In Band Error
The error count represents the number of uncorrectable errors in the digital multiplex. The
QAM receiver must be locked to the signal before errors c an be detected. A four-digit value of
0000 displayed on the LED indicates that there are no uncorrectable errors. The display shows
the short-term error count and is updated every five seconds. The maximum count is 9999.
The long-term error count is a sum of the errors occurring over the last 24 hours of DCT 2000
operation. This data is maintained between channel changes and power cycles. This count is
reset every 24 hours of DCT 2000 operation. The maximum is 9999 counts.
Figure B-8 shows the receiver status error count on the LEDs:
Figure B-8
In-band receiver status error count short term LEDs
MUTE
P
When there is no carrier lock, the LEDs display four dashes (
−−−−
).
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