COMSPHERE 3900 Series Modems
7-16
September 1998
3910-A2-GN32-40
To correct the invalid VF threshold, press the
key to return to the VF Threshold
Edit/Save/Reset screen.
F1
VF Thresholds
Edit Save Reset
F2
F3
Select Reset to restore the original default values into memory.
Repeat the Edit and Save procedure until the VF threshold(s) is valid and the Save completes
successfully (Save Completed).
To exit this function and remain in the Control branch, press the
key. To exit and return to
the Top-Level menu, press the
key.
Table 7-1
Valid Ranges for VF Thresholds
VF Thresholds
Valid Ranges
Default Values
Receive Signal Level High
0 dBm to –15 dBm
Above –9 dBm
Receive Signal Level Low
–16 dBm to –50 dBm
Below –23 dBm
Signal to Noise Ratio
5 dB to 40 dB
Below 23 dB
Non-Linear Distortion
15 dB to 50 dB
Below 30 dB
Retrains
1 to 256 trains
15 trains per 15 minutes
Signal Quality
Excellent (lowest)
Good
Fair
Poor
No Signal (highest)
Good
Near Echo
0
ā
—38 dBm
Above –20 dBm
Far Echo
0 —38 dBm
Above –20 dBm
