| 1-7 | VDD | PWR | + power input +10 to+32V all power pins must be connected |
| 8 | SERVICE | OUTPUT | Indicates unit is nearing limits of frequency control and that service is required within several months |
| 9 | DOUT | OUTPUT | UART data out at ACMOS logic levels |
| 10 | DIN | INPUT | UART data in at ACMOS logic levels |
| 11 | FREQ CTRL | ANALOG | Frequency control analog input between 0-5V |
| 12-18 | VSS | GND | Power and Signal return, all grounds must be connected |
| 19 | 1 PPS IN | INPUT | 1 PPS input, positive edge triggered |
| 20 | 1 PPS OUT | OUTPUT | 1 PPS output, may be enabled/disabled digitally |
| 21 | LOCK | OUTPUT | If low, indicates Rb oscillator is locked |
| 22 | FXO | OUTPUT | (FXO ACMOS output equalling the VCXO frequency |
| 23 | FACMOS RTN | GND | Return for FACMOS & FXO signals |
| 24 | FACMOS OUT | OUTPUT | (FACMOS) ACMOS output option – equals VCXO frequency divided by 2xN (where N is selectable) |
| 25 | FSINE RTN | GND | Chassis ground – return signal for FSINE |
| 26 | FSINE OUT | OUTPUT | (FSINE) SIne output option – equals VCXO frequency divided by 2xM(M is set at the factory) |
