The two most commonly used prescription anti-seizure medications for pets are phenobarbital (PB) and potassium bromide (KBr or K-BroVet Potassium Bromide). Diazepam is not used to prevent seizures in dogs because the effects last about 20 minutes.
In radio systems, TDMA is usually used alongside Frequency-division multiple access (FDMA) and Frequency division duplex (FDD); the combination is referred to as FDMA/TDMA/FDD. This is the case in both GSM and IS-136 for example.
AM Radio broadcasting is the oldest technology to feature them. Naturally, they are part of the black body radiation spectrum from just about every object in space. For objects as cold as the cosmic microwave background, and as part of the cosmic microwave background itself, radio waves are the dominant emission.