User Guide

RH-26
2 - System Module CCS Technical Documentation
Page 8 ©Nokia Corporation Issue 1 02/04
System Module
The system module TB6 consists of Radio Frequency (RF) and Baseband (BB) blocks. User
Interface (UI) contains display, keyboard, bluetooth, IR link, HF/HS connector and audio
parts. Part of the keyboard is implemented in a separate flip module, TF6.
The electrical part of the TB6 and half of the qwerty keyboard is located inside the flip
module.
RH-26 includes a Pop-Port™ accessory interface. Both two and three wire type of charg-
ers are supported. BL-5C Li-ion battery with nominal capacity of 850 mAh is used as
main power source.
The baseband blocks provide the MCU, DSP, external memory interface and digital con-
trol functions in the UPP ASIC. Power supply circuitry, charging, audio processing and RF
control hardware are located in the UEM ASIC.
The purpose of the RF block is to receive and demodulate the radio frequency signal from
the base station and to transmit a modulated RF signal to the base station.