User guide
ASCOM USER GUIDE
High Speed Base Band Modems
49
Item Description Explanation
A General Statistics These counters record the general performance since the last
time the modem was reset/powered up.
Total Time The number of seconds that unit has been running.
Avail Time The number of seconds that unit has been in sync.
Error Secs The number of seconds within which the unit has
detected at least one CRC error.
SVErr Secs The number of seconds within which the unit has
detected more that 1 in 100,000 CRC errors.
Link Breaks The number of times that the unit has lost sync.
With the far end. A zero value may indicate that the
unit has not yet got into sync.
B CRC Errors These counters record the number of detected CRC errors when
CRC is enabled.
C Data Test Results These counters record the lapsed time and error count for each line
when Data test has been activated. The counters reset to zero and
then started when either “PRBS” or “Pattern” is selected as Data
Test Types, and the values are frozen when “None” is selected.
See section 6.6.5 for an explanation of these figures.
In addition to the features provided by the front panel controls, it’s
possible to generate a user-selected test pattern using the “Test
Pattern” field. It is also possible to inject single errors by clicking the
“Inject 1 Error” button.
D In-Service Test These counters record the number of CRC errors detected during a
set period. The counters are reset to zero and then started when
“Running” is selected, and frozen when “None” is selected.
See section 6.6.6 for further information.
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48 ASCOM USER GUIDE
High Speed Base Band Modems
7.6 TEST COUNTS
Most of the screens can be used in the same way as the front panel menu control.
However, the Test Counts screen requires some explanation:
AM64/1024A V3.0
Test Counts
Status: No Alarm
Total Time= 2396 Error Secs= 0 Link Breaks= 0
Avail Time= 2334 SVErr Secs= 0 Test Time= 2334
Data Test Type [ ] Inject Errors In-Service Test
( ) None (x) None
(x) PRBS Inject 1 Error ( ) Running
( ) Pattern
Test Pattern 1 [ ] Enable CRC
Channel 1 Channel 2 Channel 3 Channel 4
Rx CRC 0 0 0 0
Tx CRC 0 0 0 0
Time 54 0 0 0
Errors 1 0 0 0
Time 0
Rx SVC 0 0 0 0
Tx SVC 0 0 0 0
A
B
C
D