Turbine+ series board connectors
From Zenitel Wiki
| Item | Description | Comment |
| 1 | USB Port | Used only during production process, or for recovery. |
| 2 | Relay | NO/NC relay. |
| 3 | I/O interface | 5.3V (200mA max) output and GND, and 6 x I/O connectors . Typically used as digital input (eg. from a closing contact) or digital output (5V, 12mA LED driver). |
| 4 | Line Output | 600 ohm balanced line out. For sending audio to 3rd party devices. |
| 5 | Speaker Output | Connection for 8Ω external speaker (relevant for TKIV+ kit) |
| 6 | Microphone Input | Connection for electret microphone (relevant for TKIV+ kit) |
| 7 | Power Input | 24 VDC for external secondary power if PoE/PoE+ is not available. Pin 1 is positive. |
| 8 | Network Port | 10/100/1000Mbps RJ-45 port connecting to Ethernet. PoE/PoE+ is supported. |
| 9 | SD-card slot | SD Card slot planned for future use. Currently not in use. |
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