Abstract: A transmitter (500) transmits an original digital code in a transmitted signal component of a transmitted signal to a receiver (600) through a communication channel. The receiver (600) receives a received signal having a first received signal component and a second received signal component where the transmitted signal component results in the second received signal component. The receiver (600) determines a phase between the received signal and the corresponding transmitted signal by detecting a resulting digital code in the first received signal component. A resulting digital code appears in the first received signal component when the received signal is out of phase with the transmitted signal.

Abstract: A method and apparatus for controlling data transmissions from a first communications unit (202) to a second communications unit (210). Data transmissions received from the first communications unit (202) at the second communications unit (210) are processed to determine a power level of the data transmission. In response to a determination that the power level is not within a desired range or operating window (400), an adjustment value indicating the amount of change needed in the power level of the data transmission from the first communications unit (202) to fall within the desired range or operating window (400) is determined. This adjustment value is sent to the first communications unit (202). In response to receiving an adjustment value from the second communications unit (210), the first communications unit (202) adjusts the power level of its data transmissions.

Abstract: A differential signal is coupled to an unbalanced port (116) from a balanced port (110) by receiving a first portion of a first phase of a differential signal at a first resonator (104) and receiving a second phase of the differential signal at a second resonator (108). The first portion of the first phase of the differential signal is coupled to a first matching element (112) and the second phase of the differential signal is coupled to a second matching element (118). The first portion of the first phase of the differential signal is coupled to a phasing element (122) through the first matching element (112) and a second portion of the first phase of the differential signal, which is a 180 degree out of representation of the second phase of the differential signal, is coupled to the phasing element (122) through the second matching element (118).

Abstract: The present invention provides a method and apparatus for controlling power consumption and access to telephone channels (36) in a cable telephony system (10). The system (10) has two subsystems for limiting power and access, one, when a telephone (40) is waiting to receive a call and a second when a subscriber wants to place a call. The telephone (40) is usually waiting for a telephone call. The first subsystem reduces power consumption by having a transceiver (114) for the telephone (40) only monitor for incoming calls periodically and turns off the transceiver (114) when not monitoring for calls. The second subsystem, limits system power consumption and access to channels (36) by only allowing loop current and access to channels (36) when a channel (36) is available for use. These two subsystems reduce the system power consumption and regulate the access to the telephone channels (36).

Abstract: A network interface (105) uses valid identifiers including the DN, SPID and Switch ID to communicate with a PSTN (110) and uses generic identifiers to communicate with customer premise equipment (120) in order to establish an ISDN communication link when the customer premise equipment does not know the DN, SPID, and Switch ID.

Abstract: An upstream ingress filter (300) for isolating upstream ingress noise on a bi-directional cable system having an upstream band and a downstream band for carrying upstream signals and downstream signals, respectively. The upstream ingress filter (300) includes a DC switching element (310) for changing the DC voltage on the cable system at said cable access unit and a switchable notch filter (340) that switches ON and OFF in response to the DC switching element. The notch filter isolates upstream ingress noise by attenuating upstream signals in the upstream band when the upstream ingress filter is ON. Both the DC switching element (310) and the notch filter (340) are connected in parallel to the cable (301).

Abstract: An upstream ingress filter (300) for isolating upstream ingress noise on a bi-directional cable system having an upstream band and a downstream band for carrying upstream signals and downstream signals, respectively. The upstream ingress filter (300) includes a DC switching element (310) for changing the DC voltage on the cable system at said cable access unit and a switchable notch filter (340) that switches ON and OFF in response to the DC switching element. The notch filter isolates upstream ingress noise by attenuating upstream signals in the upstream band when the upstream ingress filter is ON. Both the DC switching element (310) and the notch filter (340) are connected in parallel to the cable (301).

Abstract: A multi-level demodulator has a VCO (32) and two reference frequency sources (50, 41). A relatively long time-constant loop (45, 47) has an input coupled to the VCO, an input coupled to one of the reference frequency sources (41) and an output coupled to the VCO. A relatively short time-constant loop (51, 30) has an input coupled to the VCO, an input coupled to the other reference frequency source (50) and an output coupled to the VCO.