User's Manual Part 2

RBS 2109 User’s Guide

Note: Ports C and D can also be used as a multidrop pair.

P008428C

Far End

RBS 2 RBS 3RBS 1

A(C) B(D)

Figure 53 System View for Transmission Interface E1, 120

1. Calculate the cable attenuation between the Far End and the RBS

according to the following formula:

Cable attenuation = cable length x cable attenuation per metre (or foot).

If multidrop is used, then calculate the attenuation of the entire RBS chain,

because Receiver Sensitivity A (C) is determined by the total attenuation of

the chain. Receiver Sensitivity B (D) is determined by the total attenuation

to the last RBS in the chain.

2. If the cable attenuation is less than 6 dB, then set the receiver sensitivity to

short haul.

If the cable attenuation is greater than 6 dB, then set the receiver sensitivity

to long haul.

3. Set unused ports to short haul.

Example of Receiver Sensitivity Parameter Calculation for E1, 120

P010439A

Far End

150m

0,03 dB/m

RBS 1

A C B D

Figure 54 Example of Receiver Sensitivity Parameter Calculation for E1,

120

N/LZT 720 0090 Uen R1A 2004-09-17