A read-only value that reports the -sync lock time- for
an OLT receiver in increments of Time Quanta (TQ) 16ns
as defined in [802.3ah] 60,64,65. The value returned
shall be (sync lock time ns)/16. If this value exceeds
(2^32-1) the value (2^32-1) shall be returned.
This attribute is relevant for an OLT and an ONU.