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Can you be more specific on what kind of input these modems take?

Dear kh4,

Not really an issue but a question.

At first: thank you so much for designing the circuit. I've printed the pcb and it looks great.

I looked at the datasheet of the TCM3105 but I can't really understand what the different voltages on pin 7 and 10 (RXB and CDL) exactly do and how to calculate them.

Could you please tell me how critical the resistor values of 5,6K, 18K and 33K are? Is it ok to use 5% tolerance resistors of should they be really 1%?

Thanks for all your work!

Hi,

Not actually an issues but more to a question, what voltage should I expect from TX/RX pin on the modem? I'm getting 5v on the RX and 1.3v on the TX or maybe the other way around need to re-check :)