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2Modem/DSU Commands
2-1436800-A2-GB31-20 January 1997
Phase jitter 20 – 300 Hz
Displays the value of the high frequency range phase jitter that, when exceeded, causes
the device to report a threshold alert.
Frequency offset
Displays the frequency offset level value that, when exceeded, causes the device to report
a threshold alert.
Non-linear distortion
Displays the non-linear distortion value that, when exceeded, causes the device to report a
threshold alert.
Refer to the Change Thresholds (cht) command for a detailed description of the threshold
information.
The following fields and their possible values display for the 3910, 3911, 3920Plus and 3921Plus
modems:
• Retrains: 1–255, computed for the last 15 minutes.
• Gain hits: 1–255, computed for the last 15 minutes.
• Phase hits: 1–255, computed for the last 15 minutes.
• Impulse hits: 1–255, computed for the last 15 minutes.
• Dropouts: 1–255, computed for the last 15 minutes.
• Receive level (high): Receive level in –dBms. Possible range: 15 to 0.
• Receive level (low): Receive level in –dBms. Possible range: 50 to 16.
• Signal/noise: Signal/noise ratio in dB. Possible range: 5 to 40.
• Phase jitter 20–300 Hz: In degrees (deg). Possible range: 1 to 45.
• Freq offset: Frequency offset in Hertz (Hz). Possible range: 1 to 15.
• Non-linear distortion: Non-linear distortion in –dB. Possible range: 50 to 15.
• Signal quality threshold: An alarm is generated if the measured signal quality is less than
the signal quality threshold. Possible values: excellent, good, fair, poor and no signal.
• Near echo: Near echo threshold in –dBm. Possible range: 38 to 0.
• Far echo: Far echo threshold in –dBm. Possible range: 38 to 0.