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CA-EZTEST initially competed with three rival products: "Intertest" originally from On-line Software International, [citation needed] based in the United States.In 1991, Computer Associates International, Inc. acquired On-line Software and renamed the product CA-INTERTEST, then stopped selling CA-EZTEST.
A "dumb" ETD can be as simple as a red flag attached to the coupler on the last car of the train, whereas "smart" devices monitor functions such as brake line pressure and accidental separation of the train using a motion sensor, functions that were previously monitored by a crew in the caboose. [1]
The CPU of the device is responsible for attending the instructions related to Bluetooth of the host device, in order to simplify its operation. To do this, the CPU runs software called Link Manager that has the function of communicating with other devices through the LMP protocol. A Bluetooth device is a short-range wireless device.