User Guide

PAMS Technical Documentation 3. System Module
NSD-5
Issue 1 05/02 Nokia Corporation Page 7
Transceiver NSD-5
Introduction
The NSD-5 is a single-band radio transceiver unit for the CDMA 1900 MHz network. TX
operates at 5V. The transceiver consists of System/RF module, User Interface module, and
assembly parts.
The RF interface, which is documented in this chapter, provides internal signal definition
and an internal interface that defines the characteristics of RF intra-module signals.
The baseband section defines the signal parameters between baseband intra-modules, as
well as the interface between baseband and RF. This section of the chapter also defines
the communication protocol between some of the submodules.
The third section of this chapter describes the interface between UI and baseband. Char-
acteristics of interface signals between UI and baseband are defined as well.
The fourth section of the chapter covers the interface between system (transceiver) and
external accessories, including plug-and-play (PPH), headset, and battery.
Modes of Operation
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 the sleep clock is running.
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 the previous modes. The charge mode
itself consists of two different states: charge and maintenance mode.
The local mode is used for alignment and testing.