Motorola SG 2000 operation manual Wavelength Selection Jumper, Wavelength selection jumper

O p e r a t i o n 5 - 1 3

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:

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

2Remove 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.

3Carefully 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.

4Position the jumper block on the appropriate pins for the desired wavelength. Figure 5-15 illustrates the circuit board which is labeled to facilitate this step:

Figure 5-15

Wavelength selection jumper

Wavelength selection jumper (shown in 1310 nm position)

1550

1310

5Replace 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.

6Replace 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.

SG 2000 Installation and O peration Manual