简单来说，中继器将正常情况下收到的信号，和数据碰撞时产生的拥塞信号重复发送到所有的端口。
The hub or repeater simply repeats an incoming signal on all ports and also sends the jam signal to all ports if there’s a collision.
清洁，保证清晰的信号在长距离电缆长度，减少对信号的中继器的需要，对总安装成本节省。
Clean, crisp signals are ensured over long cable lengths, decreasing the need for signal Repeaters and saving on total installation costs.
但在Grex的系统内，水下机器人将充当一个中继站，将来自母船的控制信号传给连网的其他机器人，这种方式下的传输距离可达到数英里。
But in the Grex system, vehicles will be able to act as relay stations, bouncing a control signal from the mother ship to the networked submarines over many miles.
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