Viavi Solutions Inc.

Acterna LLC

Loren R Eggert

Daniel Keith Chappell

Robert Flask

Adam D Gray

Gregory W Massey

Thomas Renken

Daniel Eugene Cooprider

Brett Emsley

A method, apparatus and system for per-channel MER calibration and determination on a multi-channel receiver.

Per-channel modulation error ratio (MER) calibration and determination on a multi channel receiver

A CMTS may instruct one or more cable modems to transmit an upstream test signal with a particular preamble (and or any other type of signature) in the upstream transmission bandwidth. The preamble may be within a significant band of the upstream transmission bandwidth. A leakage detection device may be brought in the vicinity of the cable network to listen for various signals. The leakage detection device may filter received signals to retain the portions thereof within a desired limited band and further filter the band-limited signals to reduce noise, e.g., removing the payload following the preamble. A correlation filter in the leakage detection device may compare the pattern in the band-limited filtered signal with a stored preamble. If there is a match, the leakage detection device may generate an indication that leakage is detected in the upstream transmission.

Upstream signal leakage detection in high-split cable network

A method and test instrument for validating one or more out of band (OOB) channels in a CATV network, particularly one having a Remote PHY architecture. The method and test instrument may quickly and efficiently determine if an OOB channel is carrying valid data and is therefore 'active.'

Method and apparatus providing out of band validation by content analysis in a cable TV network

A method and an apparatus providing common path distortion (CPD) detection from a field instrument, particularly when the source of the common path distortion is at a portion of the network beyond the subscriber's tap.

Method and apparatus providing common path distortion (CPD) detection from a field instrument

Systems and methods for detecting leakage in a cable network system are disclosed. In at least some illustrative embodiments, a system may include a digital tagger operable to generate a digital tag including a chirp signal configured to be placed on a downstream signal path of the cable network system, and a cable network test instrument configured detect the digital tag in wireless signal data received from the cable network system when a point of ingress is presented in the cable network system. The network test instrument may be operable to provide a user-perceptible indication when the digital tag is detected to inform a technician or other user that a flaw in the cable network system is nearby.

Systems and methods for detecting leakage in a cable network system

A test instrument connectable to a cable television (CATV) network to provide a high resolution time domain reflectometry (TDR) in a fault location measurement is disclosed. The test instrument may have a port connectable to a test point in the CATV network. The test instrument may also have a processing circuit to perform a calibration measurement and a fault location measurement by transmitting frequency-chirped probe pulses into a closed calibration circuit within the test instrument, and receiving return signals at an analog-digital converter in the test instrument. The processing circuit may resample the calibration measurement and the fault location measurement at a high sampling rate, cross-correlate the fault location with the calibration measurement to generate a cross-correlation TDR waveform, and generate a new TDR waveform using a refinement processing technique to remove echoes from the cross-correlation TDR waveform.

High resolution time domain reflectometry (TDR) in fault location measurement in a cable network

A method and test instrument for validating MPEG content in a CATV network, particularly one having a Remote PHY architecture.

Method and apparatus providing optimized MPEG validation in a cable TV network

A method, an apparatus and a system for determining stress on a low density parity check (LDPC) process for a network using orthogonal frequency division multiplexing (OFDM).

Methods and systems for determing stress on a low density parity check (LDPC) process for a network using orthogonal frequency division multiplexing (OFDM)

Methods and systems for determining stress on a low density parity check (LDPC) process for a network using orthogonal frequency division multiplexing (OFDM)

A method and apparatus are provided for detecting network impairments through tilt-normalized measurement data, the method including: collecting data for a network signal; computing a best-fit tilt for the collected data; performing tilt-normalization of the collected data responsive to the computed best-fit tilt; and determining whether the tilt-normalized data crosses a threshold, and if so, pattern matching the tilt-normalized data to detect a network impairment; and the apparatus including: an input unit for collecting data from a network signal; a tilt unit connected to the input unit for computing a best-fit tilt for the collected data and performing tilt-normalization of the collected data responsive to the computed best-fit tilt; and a pattern matching unit connected to the tilt unit for determining whether the tilt-normalized data crosses a threshold, and if so, pattern matching the tilt-normalized data to detect at least one network impairment.

Growing community of inventors

Indianapolis, IN, United States of America

Loren R Eggert