Flexi Multiradio RF Module (FXxx)
FXxx is a 3HU high module with a 3-branch radio transceiver. The module consists of three independent branches designed to concurrently transmit and receive multicarrier signals of multiple radio technologies. One transmitter and receiver (one branch) can create one sector. One FXxx can support up to 3 sector configuration. Each sector consists of a transmitter, receiver chains and front end filters. It contains two receive chains to provide the functionality of 2-way receive diversity functionality. It is possible to chain up to 3 radio modules with OBSAI RP3-1. The front end filters are software tunable filters. FXxx contains integrated antenna line supervision and MHA support.
The RF module also contains the necessary functionalities like the digital and control cir-cuitry, RP3-1 interfaces and the required DC/DC power conversion. The RF modules are supplied with replaceable fan units.

External and internal interfaces in FXxx are:
• 48V DC
• External Alarm interface compatible with FPA
• 3 optical interfaces (OBSAI RP3-1)
• 6 Antenna interfaces - 3 duplexed and 3 RX diversity
• FXDA/FXEA/FXJA has 3 RX diversity outputs and FXCx/FXFx has 6 Rx outputs

FXxx is a single band unit; there is a separate FXxx module for each frequency band supported by Flexi Multiradio BTS as follows:
• FXCA GSM850 full band
• FXDA GSM900 full band (E-GSM)
• FXDJ GSM900 J-band (P-GSM for CDMA co-siting)
• FXEA GSM1800 full band
• FXFA GSM1900 full band

Each sector/ carrier/TRX in an FXxx can be shut down separately. The voltage of the power amplifier can be adjusted to optimize the power consumption of the module.