Руководство По Проектированию для Cisco DNCS System Release 2.7 3.7 4.2
RF Status Diagnostic Screen
78-4001708-01 Rev B
35
Current QAM
Important! On the Explorer 8300C/HDC and 8240C/HDC DHCTs, the descriptions
Important! On the Explorer 8300C/HDC and 8240C/HDC DHCTs, the descriptions
in the Current QAM section of the RF Status diagnostic screen always refer to the
first tuner. Also, the information displayed in the Current QAM descriptions is not
necessarily related to what is displayed on the main TV screen or the PIP. The only
way to verify which tuner is tied to an output is to change channels on that output
(main or PIP) and observe the frequency and modulation changes that occur in the
RF Status diagnostic screen and the Second Tuner Status diagnostic screen. To view
the status of the Second Tuner, go to Second Tuner Status Diagnostic Screen (on
page 67).
Field
Name
Description
Possible Values
Freq
The frequency (Freq) of the tuned
QPSK receiver (MHz)
QPSK receiver (MHz)
[Dependent upon setting
Tuning
Mode
Mode
The current mode of the inband
tuner
tuner
QAM-64
QAM-128
QAM-256
Analog
The following is a list of conditions
for the possible modes that are
placed after the specific tuner
mode:
• A: inband tuner is in the A
The following is a list of conditions
for the possible modes that are
placed after the specific tuner
mode:
• A: inband tuner is in the A
mode
• B: inband tuner is in the B
mode
•
s: inband tuner is scrambled
Example: QAM-256Bs
Example: QAM-256Bs
Status
The status of the receiver in regards
to receiving valid data
to receiving valid data
Locked-—tuner is locked
Unlocked—tuner is not locked
Level
The approximate received signal
level
level
-8 – +8 dBmV (value displayed in
white)—signal level is nominal
white)—signal level is nominal
>+8 – <-8 dBmV (value displayed
in amber)—signal level is
marginally too high or too low
in amber)—signal level is
marginally too high or too low
<Range or >Range (value
displayed in red)—signal level is
unacceptably too high or too low
displayed in red)—signal level is
unacceptably too high or too low
3
The level and signal-to-noise data is provided for your convenience. These measurement
results are not a substitute for measurements taken with signal level meters or spectrum
analyzers.