CASA SYSTEMS, INC. Patent applications |
Patent application number | Title | Published |
20140185630 | Systems And Methods For Performing Fiber Node Splits Using Remote QAM Modulation And Demodulation - Systems and methods are provided for performing fiber node splits in DOCSIS cable systems by performing remote modulation and/or demodulation in the fiber node. In the downstream direction, a high-speed digital fiber optic interface can be used to send data from the CMTS to the fiber node, which then modulates the data onto separate downstream interfaces for subsequent distribution of the downstream data to CMs and/or STBs. In the upstream direction, different upstream interfaces from the CMs and/or STBs may be demodulated into digital streams which can then be combined into a single, time division multiplexed digital stream that is transmitted to the CMTS. As such, the modulation and demodulation functions are performed remotely in the fiber node instead of at the CMTS. This allows the fiber portion of the network to use less-expensive, off-the-shelf networking technologies such as Ethernet, and allows for more data to be sent over the fiber network such that additional fibers and/or wavelengths are not required when performing a node split. | 07-03-2014 |
20130266049 | INTELLIGENT NODE FOR IMPROVING SIGNAL QUALITY IN A CABLE MODEM NETWORK - Systems and methods are provided for improving the signal quality and performance in a cable operator's Hybrid Fiber Coax (HFC) plant by adding DOCSIS intelligence to components within the HFC plant. These intelligent DOCSIS devices, referred to here as DOCSIS Intelligent Nodes (DINs), intercept the upstream signal from cable modems and set top boxes, and perform various types of signal processing on the signals based upon knowledge of the signal characteristics obtained from CMTS control structures such as MAPs and Upstream Channel Descriptors (UCDs). The DIN functionality can be integrated into any type of device found in HFC networks such as RF amplifiers and fiber nodes. | 10-10-2013 |
20130182752 | System and Method for Detecting Burst Noise During Quadrature Amplitude Modulation Communications - A system and method for detecting burst noise during quadrature amplitude modulation (QAM) communications are provided. A QAM signal is acquired at a receiver in communication with a network. The QAM signal is demodulated at the receiver to identify a plurality of symbols. Amplitudes for each of the plurality of symbols are determined, and are compared to a predetermined threshold. For each amplitude that is greater than the predetermined threshold, information is recorded at the receiver relating to a burst noise event. The magnitude of the burst noise can be determined by measuring a difference between a received constellation point and a perimeter constellation point closest to the received constellation point. The information about the burst noise event can be transmitted to an error correction module for reducing future burst noise in the network. Equalizer coefficients and tracking loop performance can be adjusted/enhanced using the burst noise information. | 07-18-2013 |