IPMobileNet B32450-25 User manual

I
IP PS Se er ri ie es s
B
B3 32 24 45 50 0- -2 25 5 B Ba as se e S St ta at ti io on n
P
Pr ro od du uc ct t O Ow wn ne er r’ ’s s M Ma an nu ua al l
Date Released: January 23, 2004
Document #: 516-80520-POM
Version: A
Copyright 2004 IPMobileNet, Inc.
.
16842 Von Karman Avenue, Suite 200 Irvine, CA 92606
Voice: [phone] Fax: [phone]

401855 Page 2
The term “IC”: before the radio certification number only signifies that Industry of Canada
technical specifications were met.
Operation is subject to the following two (2) conditions: (1) this devise may not cause
interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of this device.
The following U.S. Patents apply to this product:
U.S. Patent numbers 5,640,695,6,018,647,6,243,393
Information contained in this document is subject to change without notice.
All rights reserved. Reproductions, adaptations, or translation without prior written permission is
prohibited, except as allowed under copyright laws.

TABLE OF CONTENTS
401855 Page 3
SECTION 1: THEORY OF OPERATION .............................................................................................. 4
General Block Diagram.................................................................................................................. 4
General Block Diagram Definitions..................................................................................... 4
Input/Output ........................................................................................................... 4
System Controller................................................................................................... 4
Modems........................................................................................................... 5
Diversity Reception.......................................................................................... 5
RX Injection............................................................................................................ 5
Transmitter ............................................................................................................. 5
Receiver 1/ 2/ 3 ...................................................................................................... 5
Power Supply......................................................................................................... 5
B32450-25 Base Station Section Descriptions ........................................................................... 6
System Controller................................................................................................................ 6
Input/Output ........................................................................................................................ 6
Modem Switching................................................................................................................ 6
Modem ...............................................................................................................................7
Receive Signal Strength Indication Comparator................................................................. 7
Baseband ............................................................................................................................ 8
Receiver Board ................................................................................................................... 8
IF Amplifier .......................................................................................................................... 8
Receiver Injection................................................................................................................ 9
Exciter Board....................................................................................................................... 9
Analog Modulation ............................................................................................................ 10
Phase Locked Loop .......................................................................................................... 10
Power Amplifier ................................................................................................................. 11
SECTION 2: FACTORY TEST PROCEDURE .......................................................................................... 12
Equipment List ............................................................................................................................. 12
Programming and Configuring the Base Station ..................................................................... 13
Adjustment / Alignment Procedure............................................................................................ 14
Receiver Injection.............................................................................................................. 14
Receiver
............................................................................................................................ 14
Diversity Reception ........................................................................................................... 15
ReceiveData..................................................................................................................... 16
Exciter
............................................................................................................................. 17
Power Amplifier ................................................................................................................. 17
SECTION 3: FCC LABEL.......................................................................................................................... 18
B32450-25 Base Station FCC Label Placement ........................................................................ 18
B32450-25 Base Station FCC Label............................................................................................ 18
APPENDIX A: B32450-25 CIRCUIT BOARD DIAGRAM.......................................................................... 19
APPENDIX B: B32450-25 TEST DATA SHEET........................................................................................ 23

SECTION 1: THEORY OF OPERATION
401855 Page 4

GENERAL BLOCK DIAGRAM
General 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 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:
RS232 Serial Port DB9 Data Connector
RJ45 Ethernet 10 Base T Interface Connection
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 operating parameters, which are retained after the base
stations power is cycled off.

SECTION 1: THEORY OF OPERATION
401855 Page 5
Modems Convert data into an analog audio waveform for transmission and
analog audio from the receiver to serial data interface. There is one
(1) modem that is dedicated to the transmit operation and two (2)
modems dedicated to the receive operation. The modem dedicated
to transmitting supports a 115.2 KBPS data transmission rate on the
serial port, SLIP protocol, and a 32 KBPS over-the-air data
transmission rate. Provides Forward Error Correction (FEC) and
Error Detection (CRC), bit interleaving for more robust data
communications, and third generation collision detection and
correction capabilities.
Diversity Reception Circuitry selects one of three (3) diversity receiver audio outputs for
processing by the modem by comparing the Received Signal
Strength Indication (RSSI) output from each receiver. Audio from the
receiver with the highest RSSI value is passed to the modems.
RX Injection The Injection Synthesizer board provides a highly stable local
oscillator signal for the three (3) receivers. This displays a serial
data input/output interface, synthesizer, and VCO.
Transmitter Consists of an exciter and a power amplifier module covering various
frequency bands in segments. A different power amplifier module is
required for each segment. The transmitter power control is included
with the power supply circuitry on the same board.
Receiver 1/Receiver 2/ Uses three (3) discrete receivers tuned to the same frequency.
Receiver 3 The three (3) receivers are required to support IPMobileNet’s base
station Diversity Reception System (DRS).
NOTE:Some installations use only two (2) receivers.
The receivers are double-conversion superhetrodynes with an
Intermediate Frequency (IF) of 45 MHz. Each receiver consist of
bandpass filters, RF amplifiers, a mixer, 45 MHz crystal filter, and a
one-chip IF system. The injection synthesizer provides the first local
oscillator signal and outputs from each receiver including RSSI and
analog audio for Diversity Reception.
Power Supply Power supply circuitry derives the various operating voltages
required by the base station. Fixed voltage regulators are employed
through the base station for this purpose.