Exfo FG-750 Uživatelský manuál stáhnout pdf (Strana 147)

Setting Up Your RTU

Fiber Guardian 133

Managing System Setting Values

Defining Default Values for Test Setups

You can define, for monitoring and proactive maintenance (two distinct

sets of parameters), test settings such as resolution, acquisition type

(automatic or manual), range, etc. and learning settings such as the

targeted learning count, reset and expand parameters.

 Resolution: By selecting the high-resolution feature (“high”), you will

obtain more data points per acquisition. This way, the data points will

be closer to each other, which will result in a greater distance

resolution for the trace.

 Acquisition settings: With automatic settings, the application will

determine the most appropriate range, pulse width and duration for

you. If you prefer to specify these values yourself when you define a

test setup, you should select the manual settings.

 Range: Corresponds to the distance range of the fiber span to be

tested, in kilometers.

 Pulse width: A longer pulse allows you to probe further along the fiber,

but results in lower resolution. A shorter pulse width provides higher

resolution, but less distance range.

 Duration: Corresponds to the acquisition duration (period during

which results will be averaged). Generally, longer acquisition times

generate cleaner traces (this is especially true with long-distance

traces) because as the acquisition time increases, more of the noise is

averaged out. This averaging increases the signal-to-noise ratio (SNR)

and the OTDR’s ability to detect small events.

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Exfo FG-750 Uživatelský manuál Strana 147