TDEV and MTIE masks for ITU synchronizatio / clock standards

itu_masks.py

"""
    TDEV and MTIE masks for ITU Standards
    AW2017-2018

    ITU Primary Reference Clock
    https://www.itu.int/rec/T-REC-G.811/en
    
    ITU Primary Reference Time Clock
    https://www.itu.int/rec/T-REC-G.8272/en
    
    ITU Enhanced Primary Reference Time Clock
    https://www.itu.int/rec/T-REC-G.8272.1/en
"""
def eprtc_tdev(tau):
    """ Time Deviation, ITU Enhanced Primary Reference Time Clock """
    if tau<30e3:
        return 1e-9
    if tau<300e3:
        return 3.33333e-5*1.0e-9*tau
    else:
        return 10e-9

def eprtc_mtie(tau):
    """ MTIE
        ITU Enhanced Primary Reference Time Clock
    """
    if tau<=1:
        return 1e-9
    if tau <= 100:
        return 1e-9*(0.11114*tau+3.89)
    if tau<= 400000:
        return 1e-9*(0.0375e-3*tau+15)
    else:
        return 1e-9*30 # 30 ns
        
def prtc_tdev(tau):
    """ Time Deviation
        ITU Primary Reference Time Clock
    """
    if tau<100:
        return 3e-9
    if tau<1000:
        return 0.03e-9*tau
    else:
        return 30e-9

def prtc_mtie(tau):
    """ MTIE
        ITU Primary Reference Time Clock
    """
    if tau<273:
        return 1e-6* (0.275e-3*tau + 0.025)
    else:
        return 1e-6*0.1 # 100ns