Patent ID: 9525542
Filing Date: 2016-12-20
CPC Classification: H04B,H04J,H04L

Claim Text:
1. A method for synchronization to upstream transmission bursts in a passive optical network (PON) testing device, wherein the upstream transmission bursts comprise a delimiter bit sequence that is unknown to the PON testing device, the method comprising: a) receiving, by the PON testing device, a first upstream burst signal comprising a first upstream signaling burst, wherein the first upstream signaling burst includes the unknown delimiter bit sequence and a sequence of at least partially fixed bits at known fixed bit positions relative to the delimiter bit sequence; b) identifying, in the received burst signal, a matching bit pattern that matches at least one pre-defined target bit sequence, wherein the at least one pre-defined target bit sequence corresponds to the sequence of at least partially fixed bits in the first signaling burst; c) receiving the delimiter bit sequence from the received first signaling burst based on a position therein of the matching bit pattern found in step (b) and the known position of the at least partially fixed bits relative to the delimiter bit sequence in the first signaling burst, and saving said delimiter bit sequence in a delimiter memory of the PON testing device; and d) using the saved delimiter bit sequence to synchronize to subsequently received upstream transmission bursts.