User's Manual Part 2

RBS 2109 User’s Guide
In this example, Far End, RBS 1, RBS 2 and RBS 3
refer to the figure above.
Maximum input signal level at the Far End is -15 dB.
The cable attenuation is not known.
RBS 1:
1. Set LBO A to “Long h. ALBO, -15 dB”.
The cable attenuation is measured by the RBS to 5 dB.
2. The value of LBO A is set automatically by the RBS.
3. Set LBO B to “Long h., 0 dB”.
4. Set LBO C and D (not connected) to “Short h., 0 - 133 feet”.
RBS 2:
1. Set LBO A to “Long h. ALBO, 0 dB”.
The cable attenuation between RBS 1 and RBS 2 is measured
to 3 dB by RBS 2.
2. Add the two measurements to obtain the total cable
attenuation for RBS 2:
5 + 3 dB = 8 dB
3. See the table above to find the correct
LBO parameter for LBO A.
4. Set LBO A to “Long h., -7.5 dB”.
5. Set LBO B to “Long h. 0 dB”.
6. Set LBO C and D (not connected) to
“Short h., 0 - 133 feet”.
RBS 3:
1. Set LBO A to “Long h. ALBO, 0 dB”.
The cable attenuation between RBS 2 and RBS 3 is measured
to 9 dB by RBS 3.
2. Add the three measurements to obtain the total cable
attenuation for RBS 3:
5 + 3 + 9 dB = 17 dB
3. See the table above to find the correct
LBO parameter for LBO A.
4. Set LBO A to “Long h., 0 dB”.
5. Set LBO B, C and D (not connected) to
“Short h., 0 - 133 feet”.
Example 8 Calculating LBO Parameters Automatically for Long Haul
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N/LZT 720 0090 Uen R1A 2004-09-17