Hello everyone,
i'm new to gigabit transmission of data and want to use the TLK1501 for the transmission of my data between two devices.
The datasheet makes different suggestions for the Rref and termination resistors and line coupling. Poorly there are no suggestions for (shielded) twisted-pair cables such as CATx network cables. Different data sheets and other sources say CAT5/6/7 cables have an impedance of about 100 Ohm (i found values from 80-120 Ohm).
How do I to choose my termination resistors for the twisted pair case. In the datasheet there are only cases for single shieded lines, or is it the same and i have to use a 50 Ohm pullup resistor on both, the positive and negative wire, to the termination voltage on both sides for the twisted pair cable.
I guess the best case would be to use the ac-coupled interface as found on page 23 in the datasheet. Do there have to be capacitors at both sides of the cable as in the manual of the evaluation module on page 15 (chapter 2.2)?
Kind regards,
Jonas Eberhard