EXFO FTB-8510B Guia Del Usuario página 1048

Ethernet Tabs
Error/Alarm TX
Continuous: Generates the selected error for each generated frame
when the Continuous check box is selected while the On/Off button is
enabled (On). The Continuous check box is cleared by default.
On/Off button: The On/Off button is used to activate/deactivate the
selected automated error at the rate specified or continuously. This
setting is disabled (Off) by default.
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FTB-8100 Series Transport Blazer