The clockClass attribute of an ordinary or boundary clock denotes the traceability of the time or frequency distributed by the grandmaster clock. BC: Range: 0-255 1. 6 - indicates that shall designate a clock that is synchronized to a primary reference time source. The timescale distributed shall be PTP. A clockClass 6 clock shall not be a slave to another clock in the domain 2. 7 - indicates that shall designate a clock that has previously been designated as clockClass 6 but that has lost the ability to synchronize to a primary reference time source and is in holdover mode and within holdover specifications. The timescale distributed shall be PTP. A clockClass 7 clock shall not be a slave to another clock in the domain 3. 13 - indicates that shall designate a clock that is synchronized to an application-specific source of time. The timescale distributed shall be ARB. A clockClass 13 clock shall not be a slave to another clock in the domain 4. 14 - indicates that shall designate a clock that has previously been designated as clockClass 13 but that has lost the ability to synchronize to an application-specific source of time and is in holdover mode and within holdover specifications. The timescale distributed shall be ARB. A clockClass 14 clock shall not be a slave to another clock in the domain 5. 52 - indicates that degradation alternative A for a clock of clockClass 7 that is not within holdover specification. A clock of clockClass 52 shall not be a slave to another clock in the domain 6. 58 - indicates that degradation alternative A for a clock of clockClass 14 that is not within holdover specification. A clock of clockClass 58 shall not be a slave to another clock in the domain 7. 187 - indicates that degradation alternative B for a clock of clockClass 7 that is not within holdover specification. A clock of clockClass 187 may be a slave to another clock in the domain 8. 193 - indicates that degradation alternative B for a clock of clockClass 14 that is not within holdover specification. A clock of clockClass 193 may be a slave to another clock in the domain 9. 248 - indicates that default. This clockClass shall be used if none of the other clockClass definitions apply 10. 255 - indicates that shall be the clockClass of a slave-only clock Default: 6 T-BC: Range: 0-255 1. 6 - T-GM connected to a PRTC in locked mode 2. 7 - T-GM in holdover, within holdover specification, traceable or non-traceable to Category 1 frequency source 3. 135 - T-BC in holdover, within holdover specification, traceable or non-traceable to Category 1 frequency source 4. 140 - T-GM in holdover, out of holdover specification, traceable to Category 1 frequency source 5. 150 - T-GM in holdover, out of holdover specification, traceable to Category 2 frequency source 6. 160 - T-GM in holdover, out of holdover specification, traceable to Category 3 frequency source 7. 165 - T-BC in holdover, out of holdover specification 8. 248 - T-GM or T-BC without time reference since start-up 9. 255 - Slave only OC(does not send Announce messages) Default: 6