题目内容
(请给出正确答案)
[主观题]
Which of the following clock functions are supported by our PTN devices? ()
A. provide BITS external clock input/output interface functio
B.support GPS interface function; provide 1PPS+TOD signal
C.support sync Ethernet interface function; support sync Ethernet clock source
D.support network clock sync via E1 interface; provide clock signal as required by ITU-T G.813
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