Cisco DNCS System Release 2.7 3.7 4.2 Guía De Diseño
Chapter 2 System-Related Diagnostic Screens
36
78-4001708-01 Rev B
Field
Name
Description
Possible Values
S/N
The approximate signal noise ratio
(dB)
Note: The S/N ratio only applies for
QAM data channels.
(dB)
Note: The S/N ratio only applies for
QAM data channels.
QAM-64-28 dB – 34 dB
(minimum: 25 dB)
(minimum: 25 dB)
QAM-256—32 dB – 34 dB
(minimum: 30 dB)
(minimum: 30 dB)
n/a-not applicable on this DHCT
Seconds
The number of seconds that the
frequency has been locked
[Integer > 0]
Corr
Bytes
Bytes
5
The number of bytes received in
error that have been successfully
corrected by the forward error
correction (FEC) code
error that have been successfully
corrected by the forward error
correction (FEC) code
[Integer > 0]
Important! If incrementing rapidly,
picture freezing or Macroblocking
may be present.
Important! If incrementing rapidly,
picture freezing or Macroblocking
may be present.
Uncor
Blks
Blks
5
The number of data blocks received
in error that were not successfully
corrected by the FEC code
in error that were not successfully
corrected by the FEC code
[Integer > 0]
Important! If incrementing rapidly,
picture freezing or Macroblocking
may be present
Important! If incrementing rapidly,
picture freezing or Macroblocking
may be present
Errs
Avg/Inst
Avg/Inst
5
Two unique numbers that describe
data errors
data errors
First Number—the average number
of errors during the time the
frequency was locked
of errors during the time the
frequency was locked
Second Number—the number of
errors since the last time the screen
was refreshed
errors since the last time the screen
was refreshed
[Integer > 0 / Integer > 0]
EQ Gain The QAM equalizer gain (EQ Gain)
on QAM data channel
Note: The EQ Gain parameter is
only applicable on QAM data
channels.
only applicable on QAM data
channels.
0.9 – 1.0 (value displayed in
white)—signal level is nominal
white)—signal level is nominal
0.8 and 1.1 (value displayed in
amber)—signal level is marginally
too high or too low and required
you to correct the signal problem
amber)—signal level is marginally
too high or too low and required
you to correct the signal problem
<0.8 or >1.1 (value displayed in
red)—serious signal problem that
needs immediate attention
red)—serious signal problem that
needs immediate attention
4
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.
5
This field applies to QAM Data Channels only. It does not apply to analog channels.