Motorola DCT700 ユーザーズマニュアル
B-8
Diagnostics
DCT700 Installation Manual
d 03: In-band Status
This diagnostic displays 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 Diagnostic fields are:
Field Description
Field Description
Data Activity
Indicator
Lights when the set-top is receiving data on the in-band channels. The indicator covers all
packet processors regardless of which stream they are monitoring. The following variables
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 that 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 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 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:
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
Mode
Indicates the modulation mode — QAM 64 or QAM 256