Patent ID: 7092408

Claim:
A method of plesiochronous synchronization of an integer N plurality of subscriber networks to a hub network, each said subscriber network including a sub's clock; said hub network including a hub's clock; said method comprising the steps of: (A) broadcasting a plurality of control data from said hub network to each said sub network; (B) transmitting back to said hub network a first sub's network ID number (sub_id#1) in a first separate channel (channel#1) and waiting for hub's instructions to burst back; (C) bursting a set of data from said hub network to said first sub network having said sub_id#1; (D) acquiring a hub frequency by said first sub network having said sub_id#1 and locking a sub_id#1 frequency on to said hub frequency; (E1) substantially continuously measuring a short term hub's frequency error accumulated within a single burst by using a short term phase error loop filter of said sub_id#1 network; (E2) substantially continuously estimating a long term hub's frequency error accumulated within at least two bursts by using a long term frequency estimator of said sub_id#1 network; (E3) substantially continuously generating a correction command by using said symbol loop filter of said sub_id#1 network; (E4) substantially continuously digitally re-sampling a sample rate of said sub_id#1 network based on said correction command by using said sub_id#1 network sampling block; (E5) repeating said steps (E1–E4) for a plurality of bursts; and (F) repeating said steps (B–E5) for each said ‘i-th’ sub's network having an ‘i-th’ sub's network ID number (sub_id#i); wherein integer ‘i’ is greater than one and less or equal to N.