摘要:
本发明提供了调整功率的方法、网络管理系统、CMTS和CM。调整功率的方法包括:网络管理系统获取与CMTS相连的两个CM间的第一SNR CM ,第一SNR CM 表示第一CM接收到的CMTS向第一CM发送的信号与第一CM接收到的第二CM向CMTS发送的信号间的信号比;网络管理系统根据第一SNR CM 以及SNR CM 与CMTS向CM发送信号使用的发送功率之间的第一关系,向CMTS发送指示信息,指示信息用于指示CMTS调整CMTS向第一CM发送信号使用的发送功率,使得调整后的发送功率对应的SNR CM 为两个CM间的同频互干扰信噪比目标值。本发明提供了调整功率的方法、网络管理系统、CMTS和CM能够根据CM间的同频互干扰信噪比以及该同频互干扰与功率之间的关系来调整CMTS的功率,从而可以灵活改变CM间的同频互干扰信噪比,进而可以灵活地对CM进行分组。
摘要:
Approaches for performing all DOCSIS downstream and upstream data forwarding functions using executable software. DOCSIS data forwarding functions may be performed by classifying one or more packets, of a plurality of received packets, to a particular DOCSIS system component, and then processing the one or more packets classified to the same DOCSIS system component on a single CPU core. The one or more packets may be forwarded between a sequence of one or more software stages. The software stages may each be configured to execute on separate logical cores or on a single logical core.
摘要:
A communication device includes a communication port including network interface circuitry; and a processor, and a non-transitory storage medium configured to store program instructions which, when executed by the processor cause the communication device to perform a network operation comprising: entering into a listening phase; and searching for and attempting to acquire a network.
摘要:
Reverse segmentation may be provided. First, a plurality of legs may be received and combined into a first service group. Next, it may be determined that a number of active user devices increased on at least one of the plurality of legs. A portion of the plurality of legs may then be switched from the first service group to a second service group in response to determining that the number of active user devices increased on the at least one of the plurality of legs.
摘要:
Producing advanced HFC CATV cable systems while easing the burden of backward compatibility. The system improves CATV data carrying capacity by moving RF QAM modulators from the cable head end to various optical fiber nodes supplying neighborhood CATV cables, and sending data from the cable head IP backbone to the nodes over optical fiber as IP data packets. For high backward compatibility, the system digitizes legacy RF waveforms, or demodulates legacy QAM waveforms to QAM symbols, also transmits these over the optical fiber as IP data packets, and then reconstitutes back to original waveforms as needed. The system is thus able to easily handle legacy NTSC, FM, QPSK waveforms and do partial (QAM symbol level) compression of legacy QAM waveforms to and from multiple nodes without requiring additional optical fiber wavelengths. The system may use non-standard upstream/downstream CATV frequency splits, filter bank receivers, and FPGA/DSP/ASIC methods.
摘要:
Distributed and software reconfigurable CMTS (CMRTS) device, based on MAC and PHY units with FPGA and DSP components, for a HFC CATV network. The various CATV RF modulators, such as QAM modulators, may be divided between QAM modulators located at the cable plant, and remote QAM modulators ideally located at the fiber nodes. A basic set of CATV QAM data waveforms may optionally be transmitted to the nodes using a first fiber, and a second set of IP/on-demand data may be transmitted to the nodes using an alternate fiber or alternate fiber frequency, and optionally using other protocols such as Ethernet protocols. The nodes will extract the data specific to each neighborhood and inject this data into unused QAM channels, thus achieving improved data transmission rates through finer granularity. A "virtual shelf" control system for managing and reconfiguring the FPGA and DSP based CMTRS units is also disclosed.
摘要:
A method to extend the downstream and upstream data carrying capability of an HFC CATV system. At the neighborhood level, the CATV cable (the primary channel) is divided into different segments connected by electrically active junctions. At the junctions, each segment is also connected to a secondary data channel, such as an optical fiber or ultrahigh RF frequency (1 GHz+) secondary channel, which can carry supplemental downstream narrowcast channels and upstream channels between a plurality of such CATV cable segments. At the junctions, some CATV primary channel RF signals such as broadcast channels are passed without interference, while certain primary channel downstream narrowcast RF channels and upstream narrowcast RF channels are precisely suppressed using adaptive cancelling methods. Such adaptive cancellation methods are superior to prior art lowpass, highpass, and bandpass filtering methods because they allow for more efficient use of limited CATV primary channel RF spectrum.
摘要:
Some demonstrative embodiments include devices, systems and methods of transferring information between elements of a communication device. For example, a device may include a front-end to receive an analog downstream input including a plurality of downstream data channels, and to provide a digital serial downstream output including at least one continuous stream of constant-size downstream frames including a plurality of constant-size downstream data frames, which include downstream sample data of the plurality of downstream data channels; a serial interface including at least one serial lane to transfer the at least on stream of the digital serial downstream output; and a processor to receive the digital serial downstream over the serial interface, and to process the downstream data frames.
摘要:
Techniques are provided for enabling multicast traffic for a Cable Modem Termination System (CMTS) Modular Headend Architecture (MHA) system. The techniques allow a single modular CMTS core Media Access Control (MAC) domain to service a plurality of physical layer devices. When combined with an independent control plane, Downstream External physical layer (PHY) Interface (DEPI), and Upstream External physical layer (PHY) Interface (UEPI), a downstream PHY device becomes a completely independent and scalable network element.
摘要:
Disclosed are a method, device and system for transmitting data in a coaxial network. The method comprises: in a current transmission cycle, obtaining the total length of data to be sent cached by a head end device; determining, according to sending duration of the total length of the data to be sent cached by the head end device, a downlink time slot length; when a next transmission cycle arrives, sending to a terminal device time slot indication information at least comprising the determined downlink time slot length; sending, according to the determined downlink time slot length, the data to be sent cached by the head end device to each terminal, and receiving terminal cached data sent by the terminal device. In the solution provided by the embodiments of the present invention, the head end device determines, according to the sending duration of the length of data thereof to be sent in the current transmission cycle, the downlink time slot length of the next transmission cycle, thereby dynamically adjusting, according to the size of the current downlink service stream, the downlink time slot length, so that the downlink time slot length matches the service traffic to the greatest degree, thus improving the bandwidth utilization ratio.