![](/images/new-backgrounds/1272702/272702183x1.webp)
5 - 2 8 | O p e r a t i o n |
Description | Function |
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Alarm test point | (ALRM TP) provides access for measuring the | ||
| threshold. |
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3 dB test point | (3 dB TP) is used to measure the optical power of the primary receiver. | ||
| Measurements at this test point are 3 dB less than the actual value. | ||
Potentiometers ICS1 | Control the attenuation of the ingress control switches (ICS) when they are | ||
through ICS4 | installed in the return paths of the RF output ports. The factory setting is for | ||
| minimum attenuation, however, they can be set for a maximum attenuation | ||
| of approximately 40 dB. The following list indicates the potentiometer and | ||
| its corresponding housing port: |
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| ICS1 | housing port IN | RF chassis port 1 |
| ICS2 | housing port OUT | RF chassis port 2 |
| ICS3 | housing port 1 | RF chassis port 3 |
| ICS4 | housing port 3 | RF chassis port 4 |
Figure 5-29 illustrates the MCB board, switches, potentiometers, and test points:
Figure
MCB board
ICS4 ICS2 ALRM
ICS3 |
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| ICS1 |
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S2 |
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| 3 dB TP |
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| ALRM TP |
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S1
SG 2000 Installation and O peration Manual