User Guide

PAMS
Technical Documentation
NSB–1
System Module
Page 3 – 5
Original 06/98
Transceiver NSB–1
Introduction
The NSB–1 is a radio transceiver unit for the GSM1900 network. It is a
GSM phase 2 power class 4 transceiver providing 16 power levels with a
maximum output power of 1W. The transceiver is true 3 V transceiver.
The transceiver consists of System/RF module ( UR4U ), User interface
module ( UE4S ) and assembly parts.
The antenna is a fixed helix. External antenna connection is provided by
rear RF connector
The small SIM ( Subscriber Identity Module ) card is located inside the
phone, under the battery pack.
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.