US 9,813,229 B2
Communication system using low bandwidth wires
Ofer Saban, Vienna, VA (US); Isaac Shapira, Petach Tikva (IL); and Yair Zeev Shapira, Shoham (IL)
Assigned to Corning Optical Communications Wireless Ltd, Airport City (IL)
Filed by Corning Optical Communications Wireless Ltd, Airport (IL)
Filed on Nov. 22, 2013, as Appl. No. 14/87,749.
Application 14/087,749 is a continuation of application No. 12/739,143, granted, now 8,594,133, previously published as PCT/IB2008/054347, filed on Oct. 22, 2008.
Claims priority of provisional application 60/960,937, filed on Oct. 22, 2007.
Prior Publication US 2014/0079077 A1, Mar. 20, 2014
This patent is subject to a terminal disclaimer.
Int. Cl. H04J 3/06 (2006.01); H04L 7/033 (2006.01); H04J 1/06 (2006.01); H04L 7/00 (2006.01)
CPC H04L 7/0331 (2013.01) [H04J 1/06 (2013.01); H04L 7/0083 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for reconstruction of a reference signal transmitted in a communications system between a master unit having a master local oscillator and a remote unit having a remote local oscillator, the master and remote units connected by conductive wires, the reference signal being transmitted over the conductive wires together with a signal which is down-converted from an original high frequency signal to an intermediate frequency signal at the master unit and up-converted back into the original high frequency signal at the remote unit, the method comprising:
at the master unit, embedding the reference signal as a carrier of a management signal using a master modem;
transmitting the management signal with the embedded reference signal over the conductive wires to the remote unit;
at the remote unit, reconstructing the reference signal from the management signal using a phase locked loop (PLL), wherein the PLL comprises a phased detector, a charge pump, a voltage controlled crystal oscillator and a capacitor; and
using the reconstructed reference signal for synchronizing the remote local oscillator with the master local oscillator,
wherein the management signal comprises a management data bit stream and wherein the step of reconstructing the reference signal from the management signal further comprises using a charge pump shutter coupled to the PLL and synchronized with the management data bit stream to keep the reconstructed reference signal stable.