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.
Re: AM radio waves bounce off the ionospher, what do FM radio waves bounce off. Radio waves are the same thing as light waves. But the wavelength of radio waves is much longer. An AM radio wave has a wavelength in the range from 13 to 60 metres (shortwave) or around 200 to 500 metres (broadcast band).