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Any oscillator with counter will do that with few additions. If he is trying to build inverter or something like that, there are a lot of ways to achieve that waveform. Tell your friend that he has to be precise what he wants and provide details if he wants any meaningful answer.
Modem - Guess it's for line coding, to use AMI, HDB3 or something like that. In that case it's not just a static signal, it depends on data to be sent.
You can do it with TTL/CMOS logic that drives the primary of the line simetrization transformer using 2 transistors - the transformer should have a central tap.
Basicaly, for AMI you take the data signal and AND it with the clock. Depending on the previous "1", the pulse obtained will activate one of the transistors that drive the trasformer, to produce alternative invesion of the pulse.
There are also a few chips for this:
**broken link removed**
Don't know if these chips are easy to find.
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