Motorola SG 2000 operation manual Analog Retu rn Path

3 - 1 0 B e n c h S e t u p

Analog Retu rn Path

Figure 3-1 illustrates the location of the return-path transmitter modules.

To set up analog return-path transmitters:

1Confirm the transmitter configuration required. For a single transmitter, use the optical transmitter A position. The redundant transmitter uses the optical transmitter B position. Redundancy options are discussed in Section 5, “Operation.”

2For each return-path transmitter, measure the optical power level at the test point provided on the top panel of the transmitter as illustrated in Figure 5-12. The scaled voltage present at this test point is 1.0 V/mW.

3Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated to

confirm enable status. Refer to Section 5, “Operation,” for FAULT LED functions.

4Review return-path system levels. The unit is configured to drive the laser to the recommended level (+15 dBmV) when the total combined power at all ports is approximately +28 dBmV.

Digital Return Path

To set up digital return-path transmitters:

1Confirm the transmitter configuration required. For a single transmitter, use the optical transmitter A position. The redundant transmitter uses the optical transmitter B position. Redundancy options are discussed in Section 5, “Operation.”

2Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated. Refer to Section 5, “Operation,” for FAULT LED functions.

3Review return-path system levels. The unit is configured to drive the laser to the recommended level (+15 dBmV) when the total combined power at all ports is approximately +28 dBmV.

Two models of return path modules are available with analog and digital transmitters:

T￿ With the SG 2000 return path module/combined (SG2-RPM/C), the total combined power at all four ports totals approximately +28 dBmV.

T￿ With the SG 2000 return path module/split (SG2-RPM/S), the total combined power at each pair of ports is approximately +28 dBmV.

For more specific information regarding return path setup procedures, refer to the supplemental document Return Path Level Selection, Setup, and Alignment Procedure.

S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l