What is the max. cable length that the Differential TTL signals can run in both at high and low frequencies?

Hello,
            I want to now the max. cable length that the Differential TTL signals can run in both at high and low frequencies.

That is very dependant on the type of cable, its construction, and inherent impedance and capacitance. This may be of use:
http://beiied.com/PDFs2/SSI_14-15-bit-encoder_addendum.pdf
-AK2DM
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"It’s the questions that drive us.”
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