CalAmp GUARDIAN User Manual download pdf (Page 19)

2.2.6 NETWORK USING A GUARDIAN FOR ONLINE DIAGNOSTICS

The Network Using a Guardian for Online Diagnostics configuration has the following characteristics.

• Master station may be full duplex (duplexer dual antennas required), half duplex or simplex.

• Accumulated online diagnostics are available at a monitoring site (monitoring site must be in range of all remotes).

• Online Diagnostics are available in real time at the monitoring site.

• Remote Offline Diagnostics, statistics, and control are available from the monitoring site by temporarily disabling

network activity (best if using a Master Station Antenna System).

Online diagnostics are accumulated in the monitoring Guardian for the last 15 stations heard. This information may be

viewed using the Online Diagnostics utility. For larger networks, the Guardian can output raw diagnostic data through

the Setup port which may be interpreted for network management by the Field Programming Software Online

Diagnostics utility or by a user-supplied software program. Contact your sales representatives for more information.

2.3 UNDERSTANDING RF PATH REQUIREMENTS

Radio waves are propagated when electrical energy produced by a radio transmitter is converted into magnetic energy

by an antenna. Magnetic waves travel through space. The receiving antenna intercepts a very small amount of this

magnetic energy and converts it back into electrical energy that is amplified by the radio receiver. The energy received

by the receiver is called the Received Signal Strength Indication (RSSI) and is measured in dBm.

A radio modem requires a minimum amount of received RF signal to operate reliably and provide adequate data

throughput. This is the radio’s receiver sensitivity. In most cases, spectrum regulators will define or limit the amount of

signal that can be transmitted and it will be noted on the FCC license. This is the effective isotropic radiated power

(EIRP). Transmitted power decays with distance and other factors as it moves away from the transmitting antenna.

2.4 SITE SELECTION AND SITE SURVEY

2.4.1 SITE SELECTION

For a successful installation, careful thought must be given to selecting the site for each radio. These requirements can

be quickly determined in most cases. Suitable sites should provide the following.

• Protection from direct weather exposure.

• A source of adequate and stable primary power

• Suitable entrances for antenna, interface, or other cabling.

• Antenna location with an unobstructed transmission path to all remote radios in the system.

Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 11

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CalAmp GUARDIAN User Manual Page 19