Patent ID: 9118424
Filing Date: 2015-08-25
Classification: H04B,H04W

Abstract:
1. A method comprising: providing an optical network unit (ONU) having an optical interface, a radio-frequency (RF) interface, an opto-electrical (O/E) converter in a first path from the optical interface to the RF interface, and an electro-optical (E/O) converter in a second path from the RF interface to the optical interface; receiving from a head end a downstream optical signal at the ONU optical interface and passing the received downstream signal to the O/E converter; receiving an RF signal at the ONU RF interface from a customer premises device RF transmitter; detecting a level of the downstream optical signal received at the ONU; comparing the detected level of the received downstream optical signal to a reference value; amplifying the received RF signal to generate a corresponding amplified RF signal; attenuating the amplified RF signal, based on a result of the comparing, to generate a corresponding attenuated amplified RF signal; applying the attenuated amplified RF signal to the E/O converter in the second path to generate a corresponding upstream optical signal, and transmitting the upstream optical signal from the optical interface to the headend, receiving the upstream optical signal at the headend; performing a long loop automatic gain control comprising setting the reference at a reference value wherein the attenuating based on the comparing generates the upstream optical signal at a level that prevents the detected level at the headend from exceeding the given level, to prevent the headend, in performing the long loop gain control, from sending the control signal to adjust the customer premises RF transmitter output level.