GSM (Cellular) CTTs
Our new Cellular Transmitter Terminals (CTTs) units are GSM (cellular) based transmitters that utilize the latest in GPS technology for position information. The system features 2-way communication, so the reporting intervals are user defined and can be updated at any time through our integrated web portal. During each GPS cycle, the GSM will attempt to register to the network and will transmit the current GPS data in near real time. If the unit has been out of contact with cellular towers for any period of time, the unit will transmit all stored data during the next GSM registration. The stored data are sent in order, startingwith the oldest data. The units are powered by a lithium ion polymer battery with solar recharging. To protect the battery, if the voltage drops below 3.8 volts, the system will stop taking GPS fixes and will not attempt to register to the GSM network. Once the solar charging has had an opportunity to recharge the battery, the GPS fixes and GSM transmissions will resume according to the user defined schedule. All units are quad band and operate on 850, 900, 1800, and 1900 MHz. These are common frequencies that work in North and South America, Europe, the Middle East, and Africa. Some parts of Asia are on 2100 MHz, which will not work (so please contact a North Star to discuss your particular application). As the bird moves through various networks and frequencies, the device will auto-negotiate the carrier and frequency. Depending on frequency and distance to the GSM tower, the unit will transmit at up to 2 watts. All data is viewed through our web portal, where you can set alarms, update reporting cycles, and download data in CSV format. Alarms include an “inclusive” or “exclusive” geo-fence, no movement, and no transmit. The www data delivery portal is located at www.northstardatalink.com.