Page Comparison

Class

6

Primary reference

7

Primary reference (Hold)

187

Degraded reference B (Master/Slave)GIC Switch

Class

clockClass
6	clock is synchronized to a primary reference time source
7	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
52	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.
187	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.
248	Default
255	Slave only

Value (Dec)	Value (Hex)	Specification
32	0x20	The time is accurate to within 25 ns
33	0x21	The time is accurate to within 100 ns
34	0x22	The time is accurate to within 250 ns
35	0x23	The time is accurate to within 1 μs
36	0x24	The time is accurate to within 2.5 μs
37	0x25	The time is accurate to within 10 μs
38	0x26	The time is accurate to within 25 μs
39	0x27	The time is accurate to within 100 μs
40	0x28	The time is accurate to within 250 μs
41	0x29	The time is accurate to within 1 ms
42	0x2A	The time is accurate to within 2.5 ms
43	0x2B	The time is accurate to within 10 ms
44	0x2C	The time is accurate to within 25 ms
45	0x2D	The time is accurate to within 100 ms
46	0x2E	The time is accurate to within 250 ms
47	0x2F	The time is accurate to within 1 s
48	0x30	The time is accurate to within 10 s
49	0x31	The time is accurate to >10 s
254	0FE	Unknown