Title: Timing characteristics of Telecom Transparent Clocks (T-TC)

Summary

Clock specification for T-TC (transparent clock) for full timing support architecture, including noise tolerance, noise generation, noise transfer, phase transients
Two clock types defined, classes A and B
- Class A intended for short chains (up to 10 clocks), to meet ±1.5µs overall requirement
- Class B intended for long chains (up to 20 clocks), to meet ±1.5µs overall requirement
T-TCs are considered a direct replacement for T-BCs in the full timing support architecture, provided the T-TCs comprise no more than eight clocks in the overall chain (as per II.2.1 of G.8271.1)

Parameter	Conditions	Class A	Class B
Max \|TE\|	Unfiltered, 1000s	100ns	70ns
Max\|TE_L\|	0.1Hz low-pass filter,1000s	-	-
cTE	Averaged over 1000s	50ns	20ns
dTE_L MTIE	0.1Hz low-pass filter, Const. temp, 1000s	40ns	40ns
	0.1Hz low-pass filter, Var. temp, 10000s	40ns	40ns
dTE_L TDEV	0.1Hz low-pass filter, Const. temp, 1000s	4ns	4ns
dTE_H	0.1Hz high-pass filter, Const. temp, 1000s	70ns	70ns

No filtering of noise from PTP input to output
Low-pass filtering of noise on physical layer frequency input, bandwidth between 1 and 10Hz

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