User Manual

159
MN024-08
Description
The TBSI module adjusts
the signal level between
the donor source and the
Britecell Plus system.
It has 2 independent
variable attenuators to adjust both uplink and downlink separately (please
refer to BriteTool manual to understand how to calculate the right value of
attenuation through BriteTool software)
RF ports
• 1 DL RF input port
• 1 DL RF output port
(attenuated
signal)
• 1 UL RF input port
• 1 UL RF output port
(attenuated signal)
The attenuation required
both on DL and UL can be
properly set through
relevant knobs (30dB
range, 1dB step).
TBSI main
applications
Main applications of the
TBSI module are:
• adjusting RF levels
coming to/from a donor
source:
¾ TBSI adjusts the
DL signal to meet the required power level at TFLN DL RF input
¾ TBSI adjusts the RF UL signal coming from TFLN master optical TRX
in order to meet the desired requirements about blocking level and
receiver sensitivity to the donor source
TBSI insertion loss
The TBSI insertion losses are described in table 5.10:
800MHz to 2000MHz 2000MHz to 2200MHz
TBSI insertion loss
< 1dB < 1.3dB
TBSI
DL RF input port (from donor source)
DL attenuation knob
DL RF output port (to master unit)
UL RF input port (from master unit)
UL RF output port (to donor source)
UL attenuation knob
Fig. 5.21: The TBSI base station interface
Table 5.10: Insertion loss values of the TBSI module
Module name:
Base station interface
TBSI