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if a link is using baseband transmission for e.g Ethernet....thats means one signal can pass through the link at a time.....that means a baseband transmission can never be full duplex??? can anyone explain what is the relation between baseband transmissions, broadband transmissions, full-duplex and half duplex link?

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Baseband transmission is bidirectional and uses digital signal.But in baseband transmission sending and receiving can not be done at same time.So it's half duplex transmission.

Broadband transmission is unidirectional and uses analog signal.2 channels are required-1 for sending and 1 for receiving.Hence it's simplex transmission for 1 channel but 2 wires working together makes it duplex.
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