ISDN (64k) is currently the slowest transmission method for broadband. Anything lower is deemed as "dial-up"(56k).
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Orally
While there was no slowest train, the slowest trains were those that had the slowest method for propulsion. In the Netherlands, there is record of a train pulled by a dog, while in Australia, prisoners were used to pull trains. There were many trains pulled by horses, but these had higher speeds than those pulled by people. These were the slowest types of trains.
The slowest method of transportation in ancient Rome would have been the oxcart. A person could walk faster than some of them and take shortcuts that an oxcart could not.
Conduction is the slowest method of thermal energy transfer in gases. Radiation is the fastest method of thermal energy transfer in gases.
technology
No. Broadband is just a signaling method. It has nothing to do with the security, or lack thereof, of wireless networking. Wireless has very limited security since it is open to the public.
No.
describe the ancient method of transmitting information
We create new technology through the use of engineering.
The analog method of signal transmission uses radio waves to carry signals. Digital transmission involves the use of satellites to transmit signals.
ISDN