Motorola SG 2000 Betriebsanleitung PDF herunterladen (Seite 42)

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6 Operation

AT&T SLW2500 Installation and Operation Manual

Wavelength Selection Jumper

The SG2-LR can be used with either 1310 nm or 1550 nm transmitters. An internal wavelength

selection jumper optimizes the optical power test point and optical power status indicator

calibration for the system wavelength. Note that the jumper has no effect on the optical-to-RF

performance (gain, flatness, slope) of the module.

The wavelength selection jumper is factory-set and provides optimum calibration in a 1310 nm

system.

If you need to reset the jumper:

1 If necessary, remove the SG2-LR from the node.

2 Remove the five screws securing the sheet metal cover to the module casting and remove the

cover. Note the position of the optical connector assembly so that you can replace it in the

same position when you re-assemble the module.

3 Carefully lift the fiber coiling tray until the wavelength selection jumper is visible. To avoid

damaging the fiber, do not lift the tray any more than is necessary to expose the wavelength

selection jumper.

4 Position the jumper block on the appropriate pins for the desired wavelength.

Figure 5-5 illustrates the circuit board that is labeled to facilitate this step:

Figure 5-5

Wavelength selection jumper

1310

1550

Wavelength selection jumper

(shown in 1310 nm position)

5 Replace the fiber tray in the module taking care not to pinch the fiber between the coiling

tray and the circuit board or casting. Position the optical connector assembly in its original

position.

6 Replace the sheet metal cover, being careful not to pinch the fiber. Install the five screws to

secure the cover. Torque the screws to 10-12 in-lbs.

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Motorola SG 2000 Betriebsanleitung Seite 42