Motorola LM100 Provozní pokyny stáhnout pdf (Strana 41)

4-6 Operation

GX2-LM1000E* Installation and Operation Manual

The result of this formula should be within +/- 1dB of the minimum total power specification. If

it falls outside this window, change the input levels per channel and re-calculate. Repeat this

process until the answer falls within the +/- 1dB window.

To increase the channel load, you must perform one of the following procedures:

Using Set Mode

To implement an increased channel load using Set mode:

1 Operate the GX2-LM1000E* in Preset mode and apply the preferred initial channel load.

2 Allocate time for the AGC to adjust the RF drive level to the laser.

3 Select Set Equate mode to equate the Preset mode OMI setting to Set mode.

Set equate is a momentary mode and the GX2-LM1000E* soon proceeds to Set mode

automatically. Based on the additional channel load required, you need to adjust the OMI

[based on the equation: 10 x log

(ratio of channels)] from the Preset OMI set point.

4 Perform the calculation and make the appropriate OMI offset adjustment in Set mode to

maintain the same per channel power to the laser as was applied with the initial channel

load.

The benefit of using Set mode for an increase in channel load is that you eliminate the need

to re-adjust levels to each fiber node in the field.

5 Apply the planned additional channel loading.

6 Use one channel and RF TP2 to verify that the per-channel power remained the same as with

the initial channel load.

Using Manual Mode

To implement an increased channel load using Manual mode:

1 Operate the GX2-LM1000E* in Manual mode.

2 Apply the preferred initial channel load.

3 Adjust the RF attenuator setting to achieve the preferred performance.

4 Apply the additional channel load.

5 Manually adjust the RF attenuator to again achieve the preferred performance.

Any change in the number of channels applied requires that you change the RF attenuator

setting to maintain a constant signal level as measured at

RF TP2.

Manual mode does not compensate for incidental changes in the RF input signal level and

continuous monitoring and RF attenuator adjustments may be required.

Using Preset Mode (with AGC control in the GX2-LM1000E* and each node)

Implementation using Preset mode requires AGC control in the GX2-LM1000E* and in each

node.

To implement an increased channel load using Preset mode:

1 Operate the GX2-LM1000E* in Preset mode.

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Motorola LM100 Provozní pokyny Strana 41