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COMSPHERE 392xPlus Modems
3-54 November 1996 3920-A2-GN31-30
Table 3-8
(2 of 2)
Valid Ranges for VF Thresholds
VF Thresholds Default ValuesValid Ranges
Far Echo 0–38 dBm Above –20 dBm
Frequency Offset 1 Hz to 15 Hz Above 4 Hz
Phase Jitter 1 degree to 45 degrees Above 9 degrees
Phase Hits 1 to 255 hits 20 hits per 15 minutes
Impulse Hits 1 to 255 hits 20 hits per 15 minutes
Gain Hits 1 to 255 hits 20 hits per 15 minutes
Drop Outs 1 to 255 dropouts 20 dropouts per 15 minutes
Test Branch
The Test branch of the T
op-Level menu allows you to initiate various modem tests. Use these tests
if you are having data communication problems, such as periodic character loss, random errors, or
constant format errors. By the process of elimination, you can usually isolate the fault in your
system.
There are six selections under Test: Abort, Self (Self-Test), Loc Analog Loop (Local Analog
Loopback), Rem Digital Loop (Remote Digital Loopback), Loc Digital Loop (Local Digital
Loopback), and Pattern. The only tests that can operate concurrently on a single modem are Pattern
with a Local Analog Loopback and Pattern with a Remote Digital Loopback. If any test is
operating, besides the two combinations just mentioned, it must be canceled before starting another
test.
The T
est branch only initiates and cancels tests. If parameters need to be set, refer to the
Tests
section in Chapter 4.
Test
“Status”
Status Configure PList Control
SubHS
Call_Setup Tlk/Data Security Remote
Abort Self Loc_Analog_Loop Rem_Digital_Loop Loc_Digital_Loop Pattern
Port
Select
Port
Select
Port
Select