Motorola DCT2000 Installation Manual page 52

D i a g n o s t i c s
The PCR lock indicates a program-clock-reference lock with the current digital datastream.
The SNR displayed on the OSD is a rough estimate of the carrier signal-to-noise ratio. The
SNR displayed is a measure of the QAM cluster variance, which is proportional to 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:
ssss
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 can 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:
When there is no carrier lock, the LEDs display four dashes (
P
MUTE
).