Avocent ESP-4 MI, Инструкция по установке и эксплуатации, Страница: 65 / 80

Appendices
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confirm the start of a new session. If you agree, all of the data you just collected/viewed
will be discarded.
• Save - A dialog box will appear, in which you may specify where the data should be
saved. If you do not save the data, it will be lost when the datascope is restarted.
• Cancel - The polling resumes at the point where the Stop button was clicked.
To display a previously saved datascope file:
From the ESP-View utility menu, click File - Open . In the dialog box, indicate the location of the
datascope file. The file’s contents will be displayed in the ESP-View utility window. To view all
the data, you may use the scroll bar, arrow keys or the Beginning, Reverse, Forward or
End buttons.
Loopback
The loopback function runs loopback tests on an ESP-4 MI hub port and displays resulting
statistics. You may configure the port’s operating values, the loopback mode and the pattern.
The main panel of the Loopback window contains the statistical results of the tests.
• Port - port number
• Tx Bytes - number of data bytes transmitted
• Rx Bytes - number of data bytes received
• Errors - number of verification errors
• Rate - calculated throughput rate, that is, the number of data bytes per second (this calculation
will not be the same as the fixed Speed value)
The lower left panel contains the Duration (seconds) field, plus the Play, Pause and Stop buttons.
The lower right panel will contain a rotating circle when the loopback tests are running.
To use the loopback function:
1. Launch the ESP-View utility.
2. Click the Loopback tab.
-or-
From the ESP-View utility menu, select
Tools - Loopback .
3. In the Settings area, select the ESP-4 MI hub port number and the desired operating values
from the listboxes (Speed, Data, Parity and Flow Control).
4. Select a Loopback Mode.
• Internal - the data will be looped back internally.
• External - the data will go out the port to a loopback apparatus such as a wrap plug.
5. Select a Pattern.
• Barber Pole - the data is provided by the ESP-4 MI hub.
• User Defined - the ESP-4 MI hub will use whatever is specified in the adjacent Data text
field (up to 256 characters).