WESROC© RMS Satellite Repeater – User Manual
Metrotel Corporation of Minnesota, Inc.
Revision A. May 7, 2008
Page 5
Wesroc® RMS Satellite Repeater Power
The power source for the satellite repeater may be either AC power, or solar
power. The power consumption required for satellite communication makes
primary batteries prohibitive. By using external power, reliability of the system is
assured while removing the requirement that batteries be periodically replaced.
It is expected that once a Wesroc® RMS satellite repeater is properly installed in
the field using AC power, periodic service will not be required. For solar powered
satellite repeaters, it is recommended that the lead acid battery be replaced
every five years.
Wesroc® RMS Transmitters
The Wesroc® RMS Satellite Repeater is designed to manage to up to sixteen
total Wesroc® RMS transmitters. These transmitters can be mixed and matched
in any fashion. They need not be all the same type of transmitter.
The Wesroc RMS system uses a proprietary packet data protocol. This protocol
uses a strict format which includes a preamble, a packet header, payload, and
proprietary Cyclic Redundancy Code for error checking. For this reason, the
Wesroc RMS satellite repeater will reject all radio signals that are received in it’s
occupied ISM band except for properly formatted data packets from Wesroc®
RMS transmitters. There is no risk of erroneously receiving signals that may be
incorrectly interpreted as Wesroc® RMS packets.
Scheduled Reporting
The satellite repeater may be configured for scheduled reporting of data for each
transmitter which is initialized to it. It is expected that multiple transmissions from
initialized transmitters will be received by the Satellite Repeater for each
transmission through the Globalstar® simplex data network. The purpose of
scheduled reporting is to make sure that data in the Wesroc Host Computer is
reasonably kept up to date for routine data. But at the same time, the cost of
operation is kept to minimum by not sending Globalstar simplex data packets for
each and every transmission from a Wesroc® RMS transmitter. It will be up to
the end customer to decided how often they wish to have updates from specific
transmitters and weigh that against the per-packet costs.
Each Satellite Repeater is limited by Globalstar® to no more than one
transmission every 30 minutes. This is an important limit to understand. If a
particular satellite repeater has, say, eight transmitters initialized to it. And the
satellite repeater is configured so that all eight transmitters are scheduled to
report at 3:00AM. It will require four hours for all eight transmitters to be reported,
so the last transmitter will report in between 6:30AM and 7:00AM.
