Installation Manual

CHAPTER 1: INTRODUCTION
2003 IPMobileNet, Inc. 10 IPSeries MR User Manual / Rev. A / 08-Apr-03
Theory of Operation
Figure 3: General Block Diagram
Block Diagram Definitions
 For increased data security, the modem supports the Federal Government developed Digital
Encryption Standard (DES) data encryption and decryption protocols. This capability requires
installation of third party, Internet Protocol (IP) compliant DES encryption and decryption
software on the system.
The IPSeries Mobile Radio is comprised of two (2) sections, the digital section and the RF (radio
frequency) section.
The digital circuit board contains the following sections:
Input/Output Circuitry associated with the following data connectors:
 RS232 Serial Port DB9 Data Connector
 RJ45 Ethernet 10 Base T Interface Connection
 For further details on the Ethernet Controller refer to the Crystal
LAN Ethernet Controller Product Bulletin (CS8900A-
EthernetCtrlr.pdf) available on the Product Documentation CD.
Microcontroller Manages the operation of the mobile radio, the modem, and determines
which receiver provides a better signal from a given transmission. Also
provides transmit time-out protection in the event a fault causes the mobile
radio to halt in the transmit mode.
Modem Converts serial data into an analog audio waveform for transmission and
analog audio from the receiver to serial data. Within a single chip it
provides forward error detection and correction, bit interleaving for more
robust data communications, and third generation collision detection and
correction capabilities.