EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
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7- Set the Rx OUT ATT to the value desired for the uplink path
.
8- Verify that the value in the Tx IN POWER is within ±3dB of the downlink value measured using the
spectrum analyzer.
12.5.4 Set Optic Compensation
The LD (laser diode) power light is the level of power transmitted by the ODU and received by the MRU.
The PD (photo diode) power light is the level of power received by the MRU and transmitted by the ODU.
The MRU can automatically compensate for optical loss, up to a maximum 5dBo.
1- Select the SISO, ODU, DOU, ROU from the System Tree menu to reach the Optic Information screen.
(In the System Tree, “ROU” refers to the remote optical units such as the MRUs and ARUs.)
Figure 12.7 – Setting Optic Values
2- Check the LD and PD power range and OPTIC ATT to the following values:
•
LD Power Range: +7 ± 1.5dBm @1550nm
•
PD Power Range: +3 to 0dBm @1310nm
•
Tx Optic ATT: Default 12dB
3- Set Tx OPTIC COMP of MRU to
ON
.
When you turn on OPTIC COMP, the system automatically calculates the correct compensation by using
the difference between the ODU LD power and MRU PD power results.
Содержание EXPRESS Single-Carrier DAS
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