DiagnosticsB-9

Field

Description

 

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 for carrier lock. The SNR displays a number for

 

the numeric value and blank for the ssss value.

 

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

Indicates the modulation modes for analog and digital channels with the

 

following variables:

 

 

Channels

Modulation Mode

 

Analog channels

Analog

 

Digital channels

QAM 64

 

 

QAM 256

Short Term Error Count

Indicates the FEC errors (maximum count of 65535) at 5-second intervals. The

 

Short Term Error Count is cleared after polling.

Long Term Error Count

Indicates the accumulation of the Short Term Error Count (maximum count of

 

65535). The Long Term Error Count is cleared every 24 hours.

Tuned Frequency

Indicates the actual frequency the tuner is programmed (Carrier Definition

 

Frequency + 1.75 MHz).

DCT1800 Installation Manual

Page 36
Image 36
Motorola DCT1800 installation manual Snr, Good, Fair, Poor