You've got an R1900 and the GPIO cable you grabbed off the shelf doesn't seat right. That's because this one uses a 2x2MPP small connector at 20AWG – different from the RX30 series. This is the cable that pairs with the R1900, full stop. Three metres of black 20AWG, plug it in, and your GPIO channels are live
| 0 | R1900 |
| brand | Ericsson / Cradlepoint |
| connector_type | Small 2x2MPP |
| cable_length | 3m |
| wire_gauge | 20AWG |
| colour | Black |
| category | Electronics & Components > Automation & Security |