User Guide

PAMS
System Module DB6
NHB–3
Technical Documentation
Original 26/97
Page 4–4
System Module DB6
Baseband Block
Introduction
The baseband block is designed for a handportable phone, that operates in the
DCS1900 system. The purpose of the baseband module is to control the phone
and process audio signals to and from the RF block. The module also controls
the user interface.
Technical Summary
All functional baseband blocks are mounted on a single 6–layer printed circuit
board. This board contains also RF parts. The chassis of the radio unit has
separating walls for baseband and RF. All components of the baseband section
are surface mountable. They are soldered using reflow. The connections to ac-
cessories are taken through the bottom connector of the radio unit. The con-
nections to the User Interface module (UIF) are fed through a flex connector.
There is no physical connector between the RF and baseband sections.
List of submodules:
CTRLU Control Unit for the phone
PWRU Power supply
DSPU Digital Signal Processing block
AUDIO Audio coding
ASIC D2CA GSM/PCN ASIC
RFI RF – baseband interface
The blocks above are only functional blocks and therefore have no type or ma-
terial codes.