D 03: In-Band Status - Motorola DCT2500 Installation Manual

A-8 Diagnostics

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
PCR LOCK
SNR
MODULATION MODE
SHORT TERM ERROR COUNT
LONG TERM ERROR COUNT
TUNED FREQ
The In-band Status fields are:
Field Description
Data Activity 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:
Indicator
Blank
*
EMM Data Lights when the set-top is receiving a message on the EMM stream. The indicator is clear when
Indicator entering this diagnostic. The following variables can display:
Blank
*
Carrier Lock Indicates whether the digital in-band receiver is locked to the carrier with the following variables:
YES
NO
Analog
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
FAIR
POOR
Modulation Displays the following variables:
Mode
Analog
QAM 64
QAM 256
DCT2500 Installation Manual
No data received
Data received
No data received
Data received
Carrier locked
Carrier unlocked
Analog channel
Good signal
Marginal signal level − check the signal
Unusable signal
Analog channel
Digital channel
*
*
YES
YES
36 dB ssss
QAM 64
0000
9999
543.000