User's Manual

CHAPTER 1: INTRODUCTION
2003 IPMobileNet, Inc. 10 IPSeries MR User Manual / Rev. A / 04-September-03
!
Theory of Operation
Figure 4: General Block Diagram
Block Diagram Definitions
For increased data security, the modem supports the U.S. 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.
The standard IPSeries Base Station circuit board contains five (5) main sections defined below:
Input/Output Circuitry associated with one of the following base station’s data
connectors:
q RS232 Serial Port DB9 Data Connector
q 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.
System Controller Houses the modem, diversity, and Ethernet circuitry. Manages the
operation of the base station’s modem providing transmit timeout
protection in the event a fault causes the base station to become halted
in the transmit mode. The system controller also handles the loading of
selected transmit and receive frequencies into the injection synthesizer.
Includes memory for storage through Electrically Erasable
Programmable Read Only Memory (EEPROM) of the base station’s