Mckinsey , in its 2004 report , estimated it would cost as much as $ 150 million to $ 250 million to install repeater systems in all high-rise buildings in new york city at the time .
This means that , unlike in the case of a repeater , communication ( and collisions ! )
这意味着,不同于中继器,本地的信息传输(也包括数据碰撞!)
Dr shields 's photon detector , however , permits cryptographers to use a phenomenon called quantum entanglement to make a repeater that does not destroy quantum states .
They then retransmit packets from the source segment to the destination segment when necessary . This means that , unlike in the case of a repeater , communication ( and collisions ! )