A-8
Diagnostics
DCT2500 Installation Manual
d 03: In-band Status
The in-band diagnostics display for the last attempted channel tune. If a digital carrier is not
present, the diagnostics indicate the carrier lock is analog. When the carrier lock is analog, all
fields for digital (other than a carrier lock channel) are blank.
IN BAND DIAGNOSTIC
DATA
*
EMM DATA
*
CARRIER LOCK
YES
PCR LOCK
YES
SNR 36
dB
ssss
MODULATION MODE
QAM 64
SHORT TERM ERROR COUNT
0000
LONG TERM ERROR COUNT
9999
TUNED FREQ
543.000
The In-band Status fields are:
Field Description
Data Activity
Indicator
Lights when the set-top is receiving data on the in-band channels for all packet processors
regardless of which stream they are monitoring. The following variables can display:
Blank
No data received
*
Data received
EMM Data
Indicator
Lights when the set-top is receiving a message on the EMM stream. The indicator is clear when
entering this diagnostic. The following variables can display:
Blank
No data received
*
Data received
Carrier Lock
Indicates whether the digital in-band receiver is locked to the carrier with the following variables:
YES
Carrier locked
NO
Carrier unlocked
Analog
Analog channel
PCR Lock
Indicates a program-clock-reference lock with the current digital data stream.
SNR
Displays an estimate, in dB, of the carrier signal-to-noise ratio (SNR). This estimate is based on
the QAM cluster variance, which is proportional to the SNR.
ssss
can be:
GOOD
Good signal
FAIR
Marginal signal level
−
check the signal
POOR
Unusable signal
Modulation
Mode
Displays the following variables:
Analog
Analog
channel
QAM 64
Digital
channel
QAM 256