Transceiver Nse-3; Introduction; Functional Description - Nokia NSE–3 SERIES Service Manual

PAMS
Technical Documentation
Transceiver NSE–3

Introduction

The NSE–3 is a radio transceiver unit designed for the GSM network. It is a
GSM phase 2 power class 4 transceiver providing 15 power levels with a
maximum output power of 2 W. The transceiver is a true 3 V transceiver.
The transceiver consists of System/RF module (UP8T), User interface
module (UE4) and assembly parts.
The transceiver has full graphic display and two soft key based user inter-
face.
The antenna is a fixed helix. External antenna connection is provided by
rear RF connector

Functional Description

There are five different operation modes:
– power off mode
– idle mode
– active mode
– charge mode
– local mode
In the power off mode only the circuits needed for power up are supplied.
In the idle mode circuits are powered down and only sleep clock is run-
ning.
In the active mode all the circuits are supplied with power although some
parts might be in the idle state part of the time.
The charge mode is effective in parallel with all previous modes. The
charge mode itself consists of two different states, i.e. the charge and the
maintenance mode.
The local mode is used for alignment and testing.
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NSE–3
System Module
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