Installation manual

2
How does Cellemetry work?
The Cellemetry Service operates in the same manner in which roaming telephones operate
in the cellular system. A roaming telephone is defined as a cellular telephone operating in
any system other than its home system. When a cellular telephone is turned on outside of
its home system it sends its Mobile Identification Number (MIN) and its Electronic Serial
Number (ESN) to the cellular system via one of the control channels. Based on the cellular
phone number, the local cellular switch is able to communicate with the “Home System” of
the roaming telephone. It uses the SS7 network which interconnects all cellular switches
in North America to confirm the user is allowed to use the system and the phone calling
features that are available to that customer. The Cellemetry radio, like a roaming cellular
telephone, sends an ESN and MIN number over the SS7 network, but the MINs are
specifically assigned so the MIN and ESN are routed to a Cellemetry Service Gateway that
is also connected to the SS7 cellular network. The MIN serves to identify the Cellemetry
radio and the ESN is the data field that contains the Skyroute alarm message.
In this example, a traveller from Atlanta turns on his cellular phone in New York City. The
local cellular provider, through his Local Switch, communicates with the Atlanta provider via
the SS7 network to verify that roaming cellular phone can place a call.