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1 -> RS-422 RX+ 2 -> RS-422 RX- 3 -> RS-422 TX- 4 -> T1 / E1 RX+ 5 -> T1 / E1 RX- 6 -> RS-422 TX+ 7 -> NC 8 -> NC 9600 8 N 1 Hopefully you have better luck than I did at first. The cheapo Amazon RS-422 adapters can receive just fine, but the transmit is pulled down to ~60mV once connected to...

Happy to see the Telia ROM worked on your STB3, Steve. My approach to booting the STB3 further has been to use the network port. My day job involves telecom equipment, so I just happen to have a bunch of T1 equipment at my disposal. Unfortunately, I am not quite certain how the communication...