Telematics Witreless Proprietary
FCC ID:NTADMMR1
DMMR
Specification
Rev V1
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
Telematics Witreless Proprietary
FCC ID:NTADMMR1
Table Of Content
1.
INTRODUCTION ..........................................................................................................................0
1.1. DEFINITIONS, ABBREVIATION AND ACRONYMS ........................................................................0
2. DMMR DESCRIPTION ................................................................................................................4
2.1. BLOCK DIAGRAM ......................................................................................................................4
2.2. OPERATIONAL MODES...............................................................................................................0
Software and FPGA Downloading ...................................................................................0
2.3. BOARD LAYOUT AND SIZE ........................................................................................................6
2.2.1.
3. ELECTRICAL PERFORMANCE ...............................................................................................0
3.1. RECEIVE UNIT ...........................................................................................................................0
3.2. TRANSMIT UNIT ........................................................................................................................0
PSK Transmit Mode..........................................................................................................0
FSK Transmit Mode........................................................................................................10
Antenna.............................................................................................................................0
3.3. ENVIRONMENTAL CONDITIONS .................................................................................................0
3.2.1.
3.2.2.
3.2.3.
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
Telematics Witreless Proprietary
FCC ID:NTADMMR1
Introduction
The following document describes the technical specification of the Enhanced Meter &
Monitoring Reader (called DMMR) for the USA market.
The DMMR is a compact RF Receiver/Transmitter unit operating at 900MHz ISM band
(multi frequency).
The DMMR is used for wireless data collection (transmitted from water meters).
Following the data collection, the collected data is transmitted via the RF Transmitter to
another DMMR
Definitions, Abbreviation and Acronyms
TBD
1.
1.1.
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
2.
2.1.
Telematics Witreless Proprietary
FCC ID:NTADMMR1
DMMR Description
Block Diagram
A block diagram of the DMMR is described below.
DMMR
Solar Power 5V - 18V
Ext. Battery In
Charger Supply 10 -18V
Clock
Generator
12MHz
Charger
+
Power Supply
Power
Supervisor
+
Timer
32768Hz
Int. Lithium Battery
7.2V
26.6353MHz
3 x FSK
Receivers
902 - 928MHz
Rx Control
Splitter
Antenna
FPGA
I
Q
RF I&Q
Receiver
LO1 = 834-855MHz
LO2 = 766MHz
LO3 = 836MHz
T/R
SW
RF
Transmitter
(PSK/FSK)
TxD
Tx Control
RS232
Interface
Clock
Generator
14.487 MHz
DSP
USB
Interface
P
D
N
D
D
x
T
D
x
R
Figure 1 - DMMR Block Diagram
January 25, 2007
Page 0 of 11
Operational_description_17
607.doc
Telematics Witreless Proprietary
FCC ID:NTADMMR1
Operational Modes
The DMMR has 3 operational modes:
Power Down Mode
The unit is switched off except the Timer. The Timer shall wake the unit when its time
expired. The sleep time (power down) is programmable.
Receive Mode
The Receiver is enabled and collects data transmitted by water meters.. The received data
is decoded and saved in the internal memory or transmitted via the RS232/USB to external
PC/Lap Top/Pocket PC.
Transmit Mode
The Transmitter is enabled. The data collected during receive is transmitted towards the
Concentrator.
Mode
Transmit
Receive
Power Down
(Timer mode)
DSP
On
On
Off
Digital
Logic
On
On
Off
Power
Supervisor
+ Timer
On
On
On
RF
RF
Receiver
Transmitter
Off
On
Off
On
Off
Off
2.2.
2.2.1.
Software and FPGA Downloading
By connecting the DMMR to a PC via their USB interface, software and FPGA files can
be downloaded into the DMMR.
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
Telematics Witreless Proprietary
FCC ID:NTADMMR1
2.3.
Board Layout and Size
Antenna
Connector
Indication
LED
Charge
LED
DC In
12V
On/Off
Battery
Conn.
Internal
Rechargeable
Battery
Solar In
USB
PWR
Out
Comm/RS232
Figure 2 - Board Layout
January 25, 2007
Page 0 of 11
Operational_description_17
607.doc
Telematics Witreless Proprietary
FCC ID:NTADMMR1
Electrical Performance
PSK Receive Unit
The DMMR receive unit consists of 4 receivers (the receivers work simultaneously):
• PSK Receiver
• 3 x FSK Receiver
PSK Receiver
Table 1 – Receive Parameters
Parameter
Value
Receive frequency
Sensitivity (BER 1E-3)
Modulation
Bit rate
Chip rate
Bandwidth (@6dB)
Frequency stability (including initial
stability, temperature and aging)
Programmable in the range 902 MHz – 928 MHz
-114dBm
DPSK DSSS
~60 kbps
~900 kChip/sec
800 kHz – 1100kHz
<15 ppm
3.
3.1.
3.1.1.
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
Telematics Witreless Proprietary
FCC ID:NTADMMR1
FSK Receiver
The DMMR consists of 3 x FSK Receivers. Every FSK receiver will be programmed
separately according to the channel requirements
Table 2 – Receive Parameters
Parameter
Value
Receive frequency
Sensitivity (BER 1E-3)
Modulation
Frequency deviation
Bit rate
Coding
Frequency stability (including initial
stability, temperature and aging)
Programmable in the range 902 – 928 MHz
-102dBm (for 60 kbps)
FSK
Programmable
Programmable
NRZ/Manchester
<40 ppm
3.1.2.
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
Telematics Witreless Proprietary
FCC ID:NTADMMR1
Transmit Unit
The DMMR transmit unit has two operational mode (selected by the software):
• PSK Mode
• FSK Mode
PSK Transmit Mode
Table 2 – PSK Transmit Parameters
Parameter
Transmit Frequency
Modulation
Bit rate
Chip rate
Bandwidth (@6dB)
Frequency stability (including initial
stability, temperature and aging)
Peak Output power (without Antenna)
Peak Output power spectral density
(without Antenna)
Harmonics
Value
Programmable in the range
905.44 MHz – 923.55 MHz
DSSS BPSK
~60 kbps
~900 kChip/sec
800 kHz – 1100kHz
<15 ppm
21.34 dBm
<8 dBm in any 3kHz
< - 54dBm
3.2.
3.2.1.
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
Telematics Witreless Proprietary
FCC ID:NTADMMR1
3.2.2.
FSK Transmit Mode
Table 3 – FSK Transmit Parameters
Parameter
Transmit Frequency
Modulation
Modulation Coding
Bit rate (net data rate)
Frequency deviation
Bandwidth (@6dB)
Frequency stability (including initial
stability, temperature and aging)
Peak Output power (without Antenna)
Peak Output power spectral density
(without Antenna)
Harmonics
Value
Programmable in the range
905.44 MHz – 923.55 MHz
Digital Modulation – Wide Band BFSK
Manchester
~40 kbps
170 kHz
500 kHz – 650 kHz
<15 ppm
14.24 dBm
<8 dBm in any 3 kHz
< - 54dBm
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11
3.2.3.
Telematics Witreless Proprietary
FCC ID:NTADMMR1
Antenna
Antenna gain: maximum 3dBi (excluding cable loss).
There is no direct access to the antenna connector of the unit. In order to connect the
antenna, special plastic cover of the connector should be removed by extracting two
screws holding the cover. After connecting the antenna, the cover should be returned to its
original position (using the same screws) with antenna connector covered completely by
the cover.
The connection of the antenna shall be performed only by professional personnel
responsible for the operating of the unit.
3.3.
Environmental Conditions
Operating Temperature: -30° C to + 85° C
Storage Temperature: -40° C to +85° C
Humidity: Up to 95%
Operational_description_17
607.doc
January 25, 2007
Page 0 of 11