EXPRESS DAS
Installation and Operations Manual
110
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
During optical compensation, the RESULT field will display PROCESSING and then show the result:
•
Success: Optic compensation is successfully performed.
•
Over Optic Loss: Optic loss exceeds 5dBo.
•
Communication Fail: Communication between ODU and MRU failed.
When activating OPTIC COMP (by setting it to ON), the system performs optic compensation at the MRU
side and the result is applied to the ODU.
The system automatically calculates optic compensation according to the following values.
Recommended values should fall between 1dBo~5dBo:
1dBo~5dBo
LD Power [dBm] PD Power [dBm] LD-PD
OPT ATT[dB]
12-2* (LD-PD-1)
Optic Loss
1.5 ± 1
0.5
1
12
1dBo
0
1.5
11
-0.5
2
10
2dBo
-1
2.5
9
-1.5
3
8
3dBo
-2
3.5
7
-2.5
4
6
4dBo
-3
4.5
5
-3.5
5
4
5dBo
-4
5.5
3
-4.5
6
2
6dBo
Table 12.2 – Optic Compensation
If the MRU does not perform optical compensation, there will be errors in the link budget of the
system. This can cause reduced output levels and/or generate harmful spurious emissions.
NOTE:
Optic compensation depends on a working communication between the ODU and MRU. A
faulty connection or a malfunctioning R_Optic or DOU module could cause a failure in this
communication.
Содержание EXPRESS Single-Carrier DAS
Страница 10: ......