The 1588 clock type of device. Options: 1. oc(1) - indicates that 1588 clock type is Ordinary Clock 2. bc(2) - indicates that 1588 clock type is Boundary Clock 3. tc(3) - indicates that 1588 clock type is Transparent Clock 4. tcoc(4) - indicates that 1588 clock type is combination of transparent clock and ordinary clock 5. tcbc(5) - indicates that 1588 clock type is combination of transparent clock and boundary Clock 6. tbc(6) - indicates that 1588 clock type is Telecommunication Boundary Clock 7. invalid(255) - indicates that the 1588 clock type is not available