User's Manual Part 2

RBS 2109 User’s Guide
Note: It is also possible to use ports C and D as a multidrop pair.
1. If the carrier advised code is given in the Site Installation Documentation,
then use the table below to set the correct A (B, C, D) LBO parameters.
If multidrop is used, then calculate the attenuation of the entire RBS chain,
since LBO A (C) is determined by the total attenuation of the chain.
Table 38 Long Haul Parameters for Different Carrier Advised Codes at the
Network Interface
Long Haul Parameters for Different Values of the Carrier
Advised Code at the Network Interface
Cable At-
tenuation
(dB)
A (0 dB) B (-7.5 dB)
C (-15 dB)
D (-22.5 dB)
0 – 7.5
0
-7.5
-15 -22.5
7.5 – 15
N/A
0
-7.5
-15
15 – 22.5
N/A N/A
0
-7.5
> 22.5
N/A N/A N/A
0
2. If the maximum input signal level is given in the Site Installation
Documentation, use the table below to set the correct LBO A (B, C, D)
parameters.
Table 39 Long Haul Parameters for Different Maximum Input Signal Levels
Long Haul Parameters for Different Values of the
Maximum Input Signal Level at the Far End
Cable At-
tenuation
(dB)
0 dB -7.5 dB -15 dB -22.5 dB
0 – 7.5
0
-7.5
-15 -22.5
7.5 – 15
0 0
-7.5
-15
15 – 22.5
0 0 0
-7.5
> 22.5
0 0 0 0
3. If multidrop is used, then set LBO B (D) to ‘‘Long h., 0 dB’’. Used B (D)
ports in multidrop configurations should always be set to ‘‘Long h., 0 dB’’
4. Set unused ports to ‘‘Short h., 0 – 133 feet’’. Unused ports should always
be set to ‘‘Short h., 0 – 133 feet’’.
125EN/LZT 720 0090 Uen R1A 2004-09-17