The signal is for maintaining defined DC level of the signal and to key out receiver noise and unwanted signal from being amplified in the limiter. Ronja 10M Metropolis would not work without the 1MHz signal. Packets would be randomly lost due to received packet echoes from the opposite direction on shorter links, sometimes even on longer links due to random noise resembling a preamble, and most importantly, the remaining would not be received at all because corrupted preamble would be received by the AUI interface.
Fiber-optics trasceivers use also this 1MHz signal for stuffing space between packets so that Ronja is compatible with them.
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