Dead air is the silence a prospect hears between saying "hello" and a rep being connected. It is produced by the time a dialer takes to classify the answer, and it is the single clearest signal to the person answering that they are on an automated call.
A second of silence is enough. People hang up on it, and they hang up before the rep has said anything, so the call is lost without ever registering as a conversation. This is why audio bridge latency, quoted in milliseconds, is a more useful specification for a parallel dialer than its line count.
It is also inherent to multi-line dialing: something has to decide whether a human answered before a rep can be attached. A single-line dialer has none, because there is nothing to decide. Any parallel dialer claiming zero dead air is describing a power dialer.
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