User's Manual Part 2

RBS 2308 and RBS 2309 User’s Guide
1. Find out the length of the cable between the RBS and the customer
interface (the cross-connection point DSX-1). See figure above.
If multidrop is used, calculate the attenuation of the entire RBS chain,
since LBO A (C) is determined by the total attenuation of the chain from
port A (C) to the Customer Interface. LBO B (D) is determined by the total
attenuation to the last RBS in the chain.
If the cable length is not known, set the LBO parameters to “Short h.,
0 – 133 feet”.
2. Use the cable length and the table below to set the correct LBO parameters
in the OMT.
Table 42 Setting LBO Parameters to Short Haul in the OMT
Cable Length LBO Setting
Feet Metres
(in the OMT)
0–133 0–40
Short h., 0 – 133 feet
133 – 266 40 – 81
Short h., 133 – 266 feet
266 – 399 81 – 122
Short h., 266 – 399 feet
399 – 533 122 – 162
Short h., 399 – 533 feet
533 – 655 162 – 200
Short h., 533 – 655 feet
3. Set unused ports to “Short h., 0 – 133 feet”.
The following example illustrates what is said above.
P010440A
Customer
Interface
(DSX-1)
RBS 1
A C B D
200 feet
(61 metres)
In this example, customer interface (DSX-1) and the RBS
refer to the figure above.
The cable length between the RBS and the customer interface
(DSX-1) is 200 feet (61 m).
1. Set LBO A for the RBS to “Short h., 133 – 266 feet”
See the table above
2. Set LBO B, C and D for the RBS (not connected)
to “Short h., 0 – 133 feet”.
Example 6 Setting LBO Parameters to Short Haul
1
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EN
/LZT 720 0027 Uen R8A 2006-06-27