User's Manual

545C Operations Manual
02/10/2012 Prerelease DCN 00001789-A
© 2012 Meteorcomm LLC. All Rights Reserved. Proprietary and Confidential. Do Not Distribute. 3
1.1 FleetTrak™ Network
The FleetTrak™ network is used for applications that require the
position of mobile resources to be reported in real-time and at varying
update rates. The FleetTrak network is shown in Figure 1.2.
Figure 2: FleetTrak™ network diagram
The FleetTrak™ network is comprised of Base Stations, Repeaters, and
Remote Stations. The MCC-545C can be programmed to operate as any
of these three distinct station types. The FleetTrak™ network is used for
position reporting in mobile applications (AVL), fixed site data
collection (SCADA), and messaging.
The FleetTrak™ network operates line-of-sight using groundwave and
uses an LOS protocol for channel access. In an LOS network, there is
always an RF connection path between adjacent stations, and stations
transmit data whenever they have something to send. These
transmissions use CSMA (carrier sense multiple access) to gain channel
access and to prevent RF signal collisions.
The range of communication by groundwave is primarily determined by
diffraction around the curvature of the earth, atmospheric diffraction,
and tropospheric propagation. These ranges are successfully extended
by MCC from 50-100 miles through the use of robust protocols, sensitive
receivers, and short packetized messages.
CLIENT’S
OFFICES
DATA
NETWORK
DATA CENTER
OR
HOST
CLIENT’S
OFFICES
B
R
M
BASE STATION
REMOTE STATION (FIXED OR MOBILE)
REPEATER STATION
M B
M
M
M
M
R
B
R
M M M
R B
ELOS RF NETWORK
OTHER
CLIENTS