Product Description

Table Of Contents

General function, construction and units

DN991444 © Nokia Corporation Draft 55 (98)

Issue 3-0 en Draft Nokia Proprietary and Confidential

Figure 19. Block diagram of the baseband module

The BB contains the unit controller (UC), two DSPs, four ASICs and memory

circuits.

In the downlink direction, the BB reads the TRAU or PCU frames coming from

the transmission system via the D1E-bus. The data is then processed to GSM

TDMA bit format. Bursts are sent via the downlink serial bus to the RF

transmitter.

In the uplink direction, the BB receives a digital I/Q signal from the RF module

for both main and diversity branches. The samples are combined, detected,

decoded and assembled into TRAU or PCU frames for sending to the Abis

connection.

D-bus

interface

F-bus

interface

F-bus

I2CLMP

Clocks