5 — SoC based ONT functional blocks
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 5-11
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
The downstream TDM streams may be timed from one of two clocking sources: an
adaptive clock received from the MEF-8 packet stream, or a differential clock
recovered from the MEF-8 packet stream.
The business ONT calibrates its time of day from a series of network time protocol
(NTP) servers. The ONT communicates with the NTP servers using the NTP
protocol and authenticate NTP servers with a provisionable security key. During a
loss of service (LOS) state on the GPON interface, a minimum 32 ppm clock is
maintained.
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