 The dTEL (after filtering) is compared to the relevant MTIE value for each class of perform- ance. For dTEL (0.1-Hz LPF) at constant temperature over 1000 S, the limit for Class A is 40 ns, for Class B is 40 ns, and for Class C is 10 ns. For dTEL (0.1-Hz LPF) at variable temperat- ure over 10,000 S, the limit for Class A is 40 ns and for Class B is 40 ns, while Class C is not yet specified. The TDEV results for dTEL are not yet specified. The dTEA (after filtering with a 0.1-Hz high-pass filter [HPF]) over 1000 S must be less than 70 ns for Classes A and B, while the value for Class C is not yet specified. Tolerance to phase/time and frequency noise from the input (reference) signals: Currently the ability to syntonize (frequency synchronize) the T-TC is only specified using the physical method and not the PTP method, SO there is no specification for tolerance of phase/time noise via the PTP message stream. The T-TC must tolerate frequency noise (wander tolerance) that is the same as the SyncE clock (G.8262) for Classes A and B, and the same as the eSyncE clock (G.8262.1) for Class C. See the earlier section "Testing EEC and eEEC SyncE Clocks." Characteristics of the transfer of phase/time noise through the clock: For similar reasons to the noise tolerance test case, there is no specification for PTP noise transfer to PTP or PTP to 1PPS. SyncE to PTP noise transfer measures the transfer of noise from the physical frequency inter- face to the phase/time outputs. For the case of a T-TC, this noise affects the residence time measurements (wander in the physical signal shows up as inaccuracies in the CF measure- ments). There are different criteria for Classes A and B versus a Class C clock because of the difference in the limits of the bandpass filter (1-10 Hz for SyncE versus 1-3 Hz for eSyncE). But the result is the same; the phase gain inside the passband should be smaller than 0.2 dB. Transient response specifications: Not yet specified (the term used in ITU-T recommenda- tions is "for further study"). Holdover