New! View global litigation for patent families

US20100316104A1 - Wideband cable system - Google Patents

Wideband cable system Download PDF

Info

Publication number
US20100316104A1
US20100316104A1 US12853220 US85322010A US2010316104A1 US 20100316104 A1 US20100316104 A1 US 20100316104A1 US 12853220 US12853220 US 12853220 US 85322010 A US85322010 A US 85322010A US 2010316104 A1 US2010316104 A1 US 2010316104A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
wideband
channel
channels
rf
mpeg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12853220
Inventor
John T. Chapman
Alvar A. Dean
Richard J. Santarpio
John P. Prokopik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cisco Technology Inc
Original Assignee
Cisco Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65Arrangements characterised by transmission systems for broadcast
    • H04H20/76Wired systems
    • H04H20/77Wired systems using carrier waves
    • H04H20/78CATV [Community Antenna Television] systems
    • H04H20/79CATV [Community Antenna Television] systems using downlink of the CATV systems, e.g. audio broadcast via CATV network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H60/00Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/76Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
    • H04H60/81Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
    • H04H60/93Wired transmission systems
    • H04H60/96CATV systems
    • H04H60/97CATV systems using uplink of the CATV systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/2801Broadband local area networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2381Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/239Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/437Interfacing the upstream path of the transmission network, e.g. for transmitting client requests to a VOD server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4381Recovering the multiplex stream from a specific network, e.g. recovering MPEG packets from ATM cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/60Selective content distribution, e.g. interactive television, VOD [Video On Demand] using Network structure or processes specifically adapted for video distribution between server and client or between remote clients; Control signaling specific to video distribution between clients, server and network components, e.g. to video encoder or decoder; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6131Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/60Selective content distribution, e.g. interactive television, VOD [Video On Demand] using Network structure or processes specifically adapted for video distribution between server and client or between remote clients; Control signaling specific to video distribution between clients, server and network components, e.g. to video encoder or decoder; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6156Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6181Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a mobile phone network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/60Selective content distribution, e.g. interactive television, VOD [Video On Demand] using Network structure or processes specifically adapted for video distribution between server and client or between remote clients; Control signaling specific to video distribution between clients, server and network components, e.g. to video encoder or decoder; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing using dedicated Communication protocols
    • H04N21/64322IP
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/173Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309Transmission or handling of upstream communications

Abstract

A wideband cable modem system increases available bandwidth of a single channel by encoding a data stream into wideband packets. The wideband packets are associated with a logical wideband channel that extends over multiple physical downstream cable channels.

Description

    BACKGROUND
  • [0001]
    The Data Over Cable Service Interface Specification (DOCSIS) standard defines a high speed, bi-directional, data communication channel between cable providers and cable customers. The DOCSIS standard defines the layer 1 thru layer 3 communication protocols, timings, and Radio Frequency (RF) specifications for data traffic over cable systems. The communication media can be either coaxial cable or fiber.
  • [0002]
    FIG. 1 shows how Internet Protocol (IP) traffic is currently transferred over a DOCSIS system. A communication link is established between a Cable Modem Termination Systems (CMTS) 14 on the cable provider end and a Cable Modem (CM) 20 on the customer premises. Data transfers from the CMTS 14 to the CM 20 are referred to as downstream while transfers from the CM 20 to the CMTS 14 are referred to as upstream.
  • [0003]
    The CMTS 14 at a cable system headend may include a Wide Area Network connection 12, such as an Ethernet connection, that receives IP traffic. Other types of network interfaces may also be used such as Dynamic Packet Transport/Resilient Packet Ring (DPT/RPR) or Packet-over-SONET/SDH (POS) The CMTS 14 modulates the IP traffic over a single downstream channel 16 on a high speed Hybrid Fiber Coax (HFC) 19. In one instance, the single downstream channel 16 has a bandwidth limit of about 30 to 42 Million Bits Per Second (Mbps) and may supply downstream IP connectivity for up to 8000 different cable modems 20 connected to the same cable plant 19. Each cable modem 20 demodulates the downstream traffic and formats the traffic for transfer over Ethernet link 22. Upstream IP traffic is transferred over upstream channel 18.
  • [0004]
    Most cable traffic consists of data flowing in the downstream direction from CMTS 14 to CM 20. Current bandwidth may be sufficient for large numbers of cable modems with bursty traffic that can operate efficiently on shared bandwidth. However, current cable systems cannot support applications that have a high average bandwidth such as Constant Bit Rate (CBR) or Variable Bit Rate (VBR) Video.
  • [0005]
    The present invention addresses this and other problems associated with the prior art.
  • SUMMARY OF THE INVENTION
  • [0006]
    A wideband cable modem system increases available bandwidth of a single channel by encoding a data stream into wideband packets. The wideband packets are associated with a logical wideband channel that extends over multiple downstream physical cable channels.
  • [0007]
    The foregoing and other objects, features and advantages of the invention will become to more readily apparent from the following detailed description of a preferred embodiment of the invention which proceeds with reference to the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0008]
    FIG. 1 is a background diagram showing downstream and upstream channel used in a cable plant for transferring IP data.
  • [0009]
    FIG. 2 is a block diagram showing how a wideband cable system uses multiple downstream channels for carrying downstream IP traffic.
  • [0010]
    FIG. 3 is a detailed diagram of the circuitry used in a wideband cable system.
  • [0011]
    FIG. 4 shows MPEG packet ordering in a wideband channel.
  • [0012]
    FIGS. 5-9 show different fields in a wideband packet.
  • [0013]
    FIGS. 10 and 11 show how wideband channels are dynamically changed over different RF channels.
  • [0014]
    FIGS. 12-14 show how different wideband and narrowband channels are associated with different RE channels.
  • [0015]
    FIG. 15 shows how DOCSIS MAC frames can span wideband packets.
  • [0016]
    FIG. 16 shows one example of how bytes are striped over multiple RF channels.
  • [0017]
    FIG. 17 shows a wideband channel descriptor.
  • [0018]
    FIG. 18 is a block diagram showing how the wideband cable system is configured.
  • DETAILED DESCRIPTION
  • [0019]
    Referring to FIG. 2, a group of downstream RF channels 30 in an HFC 33 are bundled together into one wideband channel 35. A single RE channel 30 is defined in the nomenclature of the present invention as a NarrowBand (NB) channel. The wideband channel 35 is a logical channel that spans one or more physical RF channels 30.
  • [0020]
    An IP server 26 outputs an IP data stream to a Wideband Cable Modem Termination System (WCMTS) 28 over an Ethernet connection 27 or some other type of Wide Area Network (WAN) link. Any type of data can be sent over connection 27, but in one example a video data stream is sent. The WCMTS 28 transmits portions of the data stream over the multiple different downstream RF channels 30.
  • [0021]
    The wideband channel 35 contains a number of wideband transport sub-channels which can be dynamically adjusted for varying bandwidth requirements. Legacy protocols can be interlaced into the wideband channel maintaining backward compatibility with existing cable modems. The bandwidth of the wideband channel 35 provides scalable and efficient Variable Bit Rate (VBR) utilization of data/voice/video IP streams in a DOCSIS compatible environment.
  • [0022]
    The individual downstream RF channels 30 are received at one or more Wideband Cable Modems (WCMs) 34 on the HFC plant 33. In one embodiment, the WCMTS 28 also operates as a conventional CMTS 14 (FIG. 1) and the WCMs 34 also operate as conventional CMs 20 as shown in FIG. 1. An upstream channel 32 is used for upstream DOCSIS communications from the WCMs 34 to the WCMTS 28.
  • [0023]
    The RF channels 30 are independent of each other. All RF channels 30 could originate from a single multi-channel WCMTS 28, but each different RF channels may go to different WCMs 34. Many WCMs 34 can share a single or multiple downstream RF channels 30. Data is transmitted via the RF channels 30 by framing DOCSIS MAC frames into Motion Picture Experts Group—Transport Stream (MPEG-TS) packets.
  • [0024]
    The WCMs 34 can simultaneously demodulate each of the different channels 30 and regenerate the different portions of the original data stream received on link 27. In one example, the different portions of the data stream distributed over the different downstream RF channels 30 are reformatted back into Ethernet frames and sent over link 36 to an IP Set Top Box (STB) 38. The STB 38 converts the digital data contained in the Ethernet frames into an analog signal for displaying on a television 40.
  • [0025]
    FIG. 3 shows the circuitry in the WCMTS 28 and the WCM 34 that encode and decode the wideband channel 35. The WCMTS 28 includes a backplane 42 that couples data from the WAN connection 27 to a wideband transmit framer 44 and a Media Access Control (MAC) interface 46. In one embodiment, the wideband framer 44 separates Ethernet frames into wideband packets that are transmitted simultaneously over the multiple downstream channels 30.
  • [0026]
    In one example, the wideband channels 30 are each modulated using Quadrature Amplitude Modulation (QAM). In one example, 64 QAM modulation with 16 downstream RF channels 30 provides approximately 480 Million bits per second (Mbps) of downstream bandwidth. Using 256 QAM modulation provides approximately 640 Mbps of downstream bandwidth. Each downstream RF channel 30 is associated with a Quadrature Amplitude Modulator (QAM) and Up-Converter (U) 48. The Q&U's 48 each modulate the MPEG digital data over a different RF channel.
  • [0027]
    The MAC interface 46 is also used for transmitting DOCSIS IP data over a single RF channel 30A and receiving DOCSIS IP data over upstream RF channel 32. A demodulator 50 demodulates upstream IP traffic received over upstream channel 32. The MAC 46 in the WCMTS 28 can use the same Q&U 48A for transmitting narrowband traffic, wideband traffic, or both narrowband and wideband traffic over downstream channel 30A.
  • [0028]
    Each WCM 34 includes a wideband tuner 54 that includes multiple Tuners (T) and QAM demodulators (D) 56. The T&Ds 56 demodulate the digital data from the downstream channels 30. A wideband Receive (Rx) framer 58 reassembles data received over the different RF channels 30 into the data stream originally sent by the server 26 (FIG. 2).
  • [0029]
    A decoder 60 includes a DOCSIS MAC/PHY interface for controlling how MPEG frames are reassembled into Ethernet frames and sent over the Ethernet link 36. The MAC/PHY interface is also used for sending IP data over upstream RF channel 32 to the MAC interface 46 in CMTS 14. The MAC interface 46 in the WCMTS 28 sends a Wideband Channel Descriptor (WCD) 55 to the WCMs 34 that indicate which RF channels 30 are part of the wideband channel 35.
  • Wideband Formatting
  • [0030]
    FIG. 4 shows vertical striping of wideband MPEG-TS packets 69 in a 4-wide wideband channel 35. Wideband MPEG-TS packets 69 carry wideband DOCSIS data.
  • [0031]
    Vertical Alignment Indexes (VAIs) increment across the horizontal MPEG-TS packets 69. The VAI values in a vertical group of wideband MPEG-TS packets are shown on the horizontal axis. For example, the wideband MPEG-TS packets 1-4 are assigned VAI values of 0.
  • [0000]
    The wideband channels are effectively independent of the layer-1 physical layer (PHY) and operates as a shim between the PHY layer and the layer-2 MAC layer. This allows the downstream bandwidth to be noncontiguous. The bandwidth assigned to a particular WCM can be distributed in different noncontiguous portions of the total available RF spectrum. In other words, any selectable combination of non-contiguous RF channels can be used for any wideband channel.
  • [0032]
    The VAIs indicate a time sequence for the wideband MPEG-TS packets 69 transmitted over the RF channels. The WCMs 34 use the VAIs to realign the wideband MPEG-TS packets 69 received from the WCMTS 28 over the different RF channels. A Radio Frequency (RF) table (FIG. 17) identifies the frequencies for the RF channels and the order that the identified RF channels should be decoded by the WCM 34.
  • [0033]
    The decoder 60 uses the VAI's to temporally align the wideband MPEG-TS packets 69 transmitted over the multiple RF channels. The decoder 60 then decodes particular RF channels in a particular channel sequence identified in the RF table (FIG. 17).
  • [0034]
    In the example shown in FIG. 4, the decoder 60 reads the wideband MPEG-TS packet 1 in RF channel 1 and then reads the wideband MPEG-TS packet 2 in RF channel 2. The decoder 60 combines other wideband packets 3, 4, 5, etc. from the RF channels in a similar manner. Different WCMs 34 could scan different RF channel frequencies and in different RF channel orders according to the sequence of frequencies contained in the RF table.
  • [0035]
    FIG. 5 shows the format of the wideband MPEG-TS packet 69 in more detail. The wideband packet 69 consists of a MPEG-TS header 70, a pointer_field 72 (may not be present in all wideband packets), a wideband header 74, and a DOCSIS payload 76. One example of fields contained in the standard MPEG-TS header 70 shown in Table 1.0.
  • [0036]
    A Packet Identifier (PID) exists in the current MPEG transport scheme. Particular PID values are used in a novel manner in one embodiment of the present invention to identify payloads associated with wideband channels. The wideband PID values are used along with the RF table by the WCMs 34 (FIG. 2) to decode wideband payloads that extend over multiple downstream channels.
  • [0037]
    A Continuity Counter (CC) is a prexisting field used in a conventional MPEG header. The CC is used in a novel manner in one embodiment of the present invention for tracking wideband MPEG-TS packets that extend over multiple RF channels.
  • [0038]
    The pointer_field 72 contains the number of bytes in the wideband packet 69 that immediately follow the pointer_field 72 that the framer 58 (FIG. 3) in the WCM 34 must skip before looking for the beginning of a DOCSIS MAC frame. The pointer_field 72 may point to the beginning of a DOCSIS MAC frame. Alternatively, the pointer_field 72 may point to any stuff byte preceding the DOCSIS MAC frame. The pointer_field was previously used in DOCSIS to identify consecutive MPEG-TS packets in a same RF channel. The wideband scheme according to one embodiment of the invention uses the pointer_field 72 to identify payloads that extend across multiple RF channels.
  • [0000]
    TABLE 1.0
    MPEG-TS Header Format for Wideband MPEG-TS packets
    Length
    Field (bits) Description
    sync_byte 8 MPEG-TS packet Sync byte
    transport_error_indicator 1 Indicates an error has
    occurred in the reception
    of the packet. This bit is
    reset to zero by the sender,
    and set to one by the receiver
    whenever an error occurs in
    transmission of the packet.
    payload_unit_start_indicator 1 A value of one indicates the
    (PUSI) presence of a pointer_field as
    the fifth byte of the packet
    transport_priority 1 Reserved; set to zero
    PID 13 Wideband channel packet
    identifier:
    transport_scrambling_control 2 Reserved
    adaptation_field_control 2 Use of the adaptation_field
    may not be allowed on
    wideband channel PIDs
    continuity_counter (CC) 4 Cyclic counter within a
    wideband channel PID
    per RF channel
  • [0039]
    Table 2.0 shows the wideband header 74 in more detail. The wideband header 74 contains reserved bits followed by the Vertical Alignment Index (VAI). The reserved field can be used to compensate for skew. For example, one of the RF channels may be substantially ahead of the other RF channels. The reserved field may be used to identify the same VAI for two sequencial wideband MPEG-TS packets. The exact position of the wideband header 74 within a wideband MPEG-TS packet 69 can vary depending on whether or not the pointer_field 72 is present.
  • [0000]
    TABLE 2.0
    Wideband Header Format
    Length
    Field (bits) Description
    Reserved 2 Reserved
    Vertical Alignment 6 A cyclic counter generated by the
    Index WCMTS conveys the vertical alignment
    of wideband MPEG-TS packets on all
    associated RF channels.
  • [0040]
    The DOCSIS payload 76 in wideband MPEG-TS packet 69 can carry DOCSIS MAC frames and can also carry stuff bytes. The WCMTS 28 can insert conventional MPEG-TS null packets or wideband MPEG-TS null packets in an inactive wideband channel. Unlike conventional MPEG-TS null packets, wideband MPEG-TS null packets can provide VAIs to the WCMs 34.
  • [0041]
    The DOCSIS MAC frames can begin anywhere within the payload 76 of the wideband MPEG-TS packet 69 and may span multiple wideband MPEG-TS packets. Several DOCSIS MAC frames may exist within a single wideband MPEG-TS packet.
  • [0042]
    FIG. 6 shows a Payload Unit Start Indicator (PUSI) bit in the MPEG-TS header 70 that indicates the presence or absence of the pointer_field 72 as the first byte of the MPEG-TS payload. The start of a DOCSIS MAC frame 78 in DOCSIS payload 76 is positioned immediately after the wideband header 74. In FIG. 6, the pointer_field 72 is 1, and the decoder 60 in the WCM 34 begins searching for a valid DOCSIS MAC sublayer Frame Control (FC) immediately following the wideband header 74.
  • [0043]
    FIG. 7 shows the case where a DOCSIS MAC frame 2 is preceded by the tail of a previous DOCSIS MAC frame 1 and possibly a sequence of stuff bytes 83. The pointer_field 72 identifies the first byte after the tail of frame 1 (which could be a stuff byte) as the position where the decoder 60 in the WCM 34 should begin searching for a DOCSIS MAC sublayer frame control value.
  • [0044]
    FIG. 8 shows multiple DOCSIS MAC frames 1, 2, and 3 contained within the same wideband MPEG-TS packet 69. The DOCSIS MAC frames may follow one after the other, or may be separated by an optional sequence of stuff bytes 83. FIG. 9 shows the case where, a DOCSIS MAC frame 1 spans multiple wideband MPEG-TS packets 69A, 69B and 69C. The wideband MPEG-TS packet 69C encapsulates the start of the next MAC frame 2. The pointer_field 72C for wideband packet 69C points to the byte following the last byte of the tail of MAC frame 1.
  • Wideband Dynamic Bandwidth Allocation
  • [0045]
    FIG. 10 shows how the bandwidth of the wideband channel can be dynamically adjusted by changing the number of RF channels. In one example, the wideband channel bandwidth is adjusted at wideband MPEG-TS packet boundaries. The WCMTS 28 (FIG. 3) can dynamically vary the bandwidth of multiple different wideband channels simply by varying the wideband configuration parameters in the RF table associated with different PIDs.
  • [0046]
    For example, FIG. 10 shows three wideband channels PID=X, Y, and Z mapped over four RF channels 1-4. The three wideband channels are configured using a RF channel frequency tables. The RF channel frequency table is part of the wideband channel descriptors that specify wideband channels as entering over RF channels 1-4. The channel frequency table is part of the wideband channel descriptor 55 shown in FIG. 17.
  • [0047]
    Pursuant to the RF frequency table, the WCM 34 finds the wideband data by monitoring all four RF channels 1-4 for wideband packets having certain PID values (See Table 1.0). The WCM 34 further filters the wideband channel data by, looking for MAC addresses in the Destination Address (DA) field of the Ethernet packets in the DOCSIS MAC frame payloads within the wideband channel.
  • [0048]
    FIG. 10 shows a wideband channel PID=X that uses the entire bandwidth of all four RF channels 1, 2, 3, and 4 when the wideband MPEG-TS packets 69 have Vertical Alignment Indexes (VAI) equal to N. For the next wideband MPEG-TS packets transported at VAI=N+1, RF channels 1 and 2 carry wideband channel PID=Y and RF channels 3 and 4 continue to carry wideband channel PID=X. The equal division of bandwidth between wideband channels X and Y continues until the wideband MPEG-TS packets have VAIs equal to M+1.
  • [0049]
    At VAI=M+1, wideband channel X again utilizes the entire bandwidth of all four RF channels. This RF channel utilization continues up to and including when the transported wideband MPEG-TS packets have VAIs equal to P. When the next wideband MPEG-TS packets are transported at VAI=P+1, RF channels 2-4 are used for wideband channel Z while RF channel 1 is used for wideband channel X.
  • [0050]
    The WCM decoder 60 reads the PID values in each wideband packet 69. Since all wideband packets for VAI=N have the same PID value, the WCM decoder 60 combines these packets together as part of the same wideband channel. At VAI=N+1, the wideband packets for RF channels 1 and 2 have PID=Y and the RF channels 3 and 4 have PID=X. The WCM decoder 60 by reading the PIDs knows to combine the MPEG frames, if appropriate, for wideband channel X in the RF channels 3 and 4 with other MPEG frames previously received in RF channels 1-4 for wideband channel X at VAI=1. The WCM decoder 60 similarly combines when appropriate the MPEG frames received in wideband channel Y over RF channels 1 and 2 for VAI=N+1 through VAI=M.
  • [0051]
    FIG. 11 shows how the Vertical Alignment Indexes (VAIs) operate in combination with Continuity Counters (CCs). The CC is a field incremented with each transport stream packet having the same Packet Identifier (PID). In one example, seventeen wideband MPEG-TS packet slots VAI=0 through VAI=16 are transmitted over each of four RF channels. Two wideband channels X and Y are mapped over the four RF channels 1, 2, 3 and 4.
  • [0052]
    The VAI values are used for aligning vertical groups of wideband MPEG-TS packets across all the RF channels. The CC values increment horizontally across RF channels according to the wideband channel. The CCs in wideband MPEG-TS packets are treated independently for each RF channel PID. This allows the WCM decoder 60 to determine which wideband packets in a sequence for a particular RF channel have been received, even when wideband packets for a particular wideband channel are not transmitted for certain VAI packet slots.
  • [0053]
    FIG. 12 shows six fiber nodes A-F, each with a separate forward carrier path. Each forward carrier path contains its own RF spectrum. The wideband channels WB1-WB4 are associated with the RF channels 1-4 and the narrow band channels NB1-NB4 are associated with RF channel 5. Fiber nodes A and 13 each share the same narrowband channel NB 1 and wideband channel WB 1. This results in a single association of WB 1 to NB 1. It should be understood that this is only one example, and any combination of any number of wideband and narrowband channels can be associated with any number and combination of RF channels.
  • [0054]
    Fiber nodes C and D share wideband channel WB2 and each have their own narrowband channels NB2 and NB3, respectively. This results in two separate associations of WB2 to NB2, and WB2 to NB3. Fiber nodes E and F share the same narrowband channel NB4, but have different wideband channels WB3 and WB4, respectively. This results in two separate associations of WB3 to NB4 and WB4 to NB4. In one embodiment, there is one PID associated with each wideband channel. The wideband channel descriptors associated with a particular PID then identify to the WCMs of the RF channels and sequence associated with the wideband channels and narrowband channels.
  • [0055]
    The wideband channel descriptor 55 (FIG. 3) is sent by the WCMTS 28 over the narrowband channel 30A. The WCD 55 contains channel descriptors that identify the RF channel frequencies, sequence, and PIDs for the wideband channels associated with each fiber node A-F. Each unique association of wideband channel to narrowband channel may have its own wideband channel descriptor.
  • Interleaving Wideband and Narrowband Channels
  • [0056]
    Narrowband and wideband cable modems can receive narrowband MPEG-TS packets over either an RF channel dedicated to a narrowband channel, or an RF channel where wideband and narrowband channels are interleaved. FIGS. 13 and 14 illustrate two different scenarios.
  • [0057]
    FIG. 13 shows five RF channels 1-5. RF channels 1-4 carry wideband MPEG-TS packets 90 for wideband channel X. The RF channel 5 carries narrowband MPEG-TS packets 92 in a narrowband channel (PID=DOCSIS PID). The wideband packets 90 from RF channels 1-4 are combined together by the WCM 34 to generate a single wideband data stream. The narrowband packets 92 from RF channel 5 are combined together to generated a single narrowband data stream.
  • [0058]
    FIG. 14 shows another interleaving configuration where RF channels 1-4 carry both wideband and narrowband channels. The wideband channel X extends over different combinations of all four RF channels 1-4 and the narrowband channel (PID=DOCSIS PID) is interleaved with the wideband channel X on RF channel 4.
  • [0059]
    The bandwidth of wideband channel X can be dynamically adjusted to allow the narrowband channel 92 to share the bandwidth of RF channel 4 during the packet slots from VAI=N+1 through VAI=M. The WCMs 34 (FIG. 3) are configured using the WCD 55 (FIG. 17) to receive wideband channel X over RF channels 1-4. The WCM decoder 60 identifies the narrowband packet 92 at VAI=N+1 by detecting PID=DOCSIS PID in the MPEG-TS header. The WCM decoder 60 processes the narrowband packet 92 as a conventional single band DOCSIS MPEG-TS packet by combining packet 92 with other narrowband packets identified (PID=DOCSIS PID) on RF channel 4.
  • [0060]
    FIG. 15 is an example showing how DOCSIS MAC frames span multiple wideband MPEG-TS packets 98 even when the wideband channel bandwidth dynamically changes. In this example, two wideband channels PID=X and PID=Y and a narrowband channel 94 are interleaved across four RF channels 1-4. The wideband channel descriptor in FIG. 17 identifies the RF channels 1-4 associated with wideband channels X and Y.
  • [0061]
    The first three wideband MPEG-TS packets transmitted on RF channels 1-3 have VAI=0 and PID=X. The RF channel 4 at VAI=0 has a PID=DOCSIS PID. At VAI=1, RF channels 1 and 2 have PID'=Y. The wideband MPEG-TS packets for RF channels 3 and 4 at VAI=1 have PID=X. Narrowband MPEG-TS packets do not contain a VAI field. The values of the Continuity Counters (CCs) in the first four vertical MPEG-TS packets are arbitrarily chosen to illustrate the independence of CCs between RF channels.
  • [0062]
    The decoders 60 in the WCMs 34 conduct the following wideband striping sequence according to the above VAI and PID values. The DOCSIS MAC frame X1 begins inside the wideband MPEG-TS packet 98 with VAI=0 on RF channel 1. The PID value of X in the MPEG-TS header 96 identifies the wideband MPEG-TS packet 98 as part of wideband channel X. The wideband MPEG-TS packet 98 has a Payload Unit Start Indicator (PUSI) bit in the MPEG-TS header 96 set to 1, indicating that the pointer_field is present. The pointer_field points to one of the stuff bytes 97 preceding the beginning of DOCSIS MAC frame X1.
  • [0063]
    The DOCSIS MAC frame X1 continues in the wideband MPEG-TS packet 100 on RF channel 2 at VAI=0. The entire payload of the wideband MPEG-TS packet 100 contains the continuation of DOCSIS MAC frame X1 from RF channel 1. The PUSI bit is accordingly set to 0 and there is no pointer_field. In one embodiment, stuff bytes are only inserted between DOCSIS MAC frames, therefore no stuff bytes exist in wideband MPEG-TS packet 100.
  • [0064]
    The DOCSIS MAC frame X1 ends on the wideband MPEG-TS packet 102 on RF channel 3 at VAI=0. The DOCSIS MAC frame X1 is immediately followed by DOCSIS MAC frame X2. The DOCSIS MAC frame X2 is a small frame totally contained in wideband MPEG-TS packet 102. The pointer_field 106 is used in wideband packet 102 to point to the beginning of new DOCSIS MAC frame X2. The DOCSIS MAC frame X2 is followed by optional stuff bytes 108 and the beginning of DOCSIS MAC frame X3.
  • [0065]
    Although wideband MPEG-TS packet 102 contains the beginning of two DOCSIS MAC frames X2 and X3, the pointer_field points to the first new MAC frame X2.
  • [0066]
    The narrowband MPEG-TS packet on RF channel 4 and the wideband MPEG-TS packets with VAI=1 on RF channels 1 and 2 do not have a PID value of X. The DOCSIS MAC frame X3 accordingly is continued on the next wideband MPEG-TS packet 104 with VAI=1 and PID=X on RF channel 3. The DOCSIS MAC frame X3 ends in the wideband MPEG-TS packet 110 on RF channel 4 having VAI=1. The DOCSIS MAC frame X3 in wideband packet 110 is followed by a number of stuff bytes 114 and the start of DOCSIS MAC frame X4. The pointer_field 112 in wideband MPEG-TS packet 110 points to the beginning of DOCSIS MAC frame X4. Alternatively, the pointer_field 112 could point to any of the preceding stuff bytes 114.
  • MPEG Over MPEG Byte Striping
  • [0067]
    FIG. 16 shows one alternative embodiment referred to as vertical byte striping. Referring to FIGS. 3 and 16, a wideband transport channel 120 is created by vertically byte-striping MPEG-TS packets over multiple horizontal MPEG-TS streams. At the physical layer, each RF channel 1-4 runs independently as a separate MPEG-TS stream. At the link layer, the wideband transmitter 44 aligns the various RF channels 1-4 that make up a wideband transport sub-channel by selecting values in the PID field in MPEG-TS header 125. The wideband decoder 60 in FIG. 3 corrects for jitter in the RF channels 1-4 between the wideband transmitter 44 and wideband receiver 58 using the VAI values 124 to realign the horizontal MPEG-TS streams. The receiving WCMs 34 recreate the original MPEG-TS stream by de-striping the vertical MPEG-TS stream from the horizontal MPEG-TS streams.
  • [0068]
    The wideband channel 120 can be run as a single fat wideband transport sub-channel, sub-divided into several smaller wideband transport sub-channels, or run as a mixture of wideband transport sub-channels and narrowband channels. In FIG. 16, during the first horizontal MPEG-TS packet time, RF channels 1, 2 and 3 are run as a 3-wide wideband transport channel, while RE channel 4 is run as a narrowband channel.
  • [0069]
    The PID field in the MPEG packet header 125 indicates which RF channels are being used to stripe the wideband data for a given wideband transport sub-channel. The PID is set to the value of X for the wideband transport sub-channel. The PID value X can be any value except reserved values (e.g. 0x1FFFE). In this example, the WCMTS 28 knows that there is a 4-channel wide wideband receiver 58 listening on the four RF channels 1-4.
  • [0070]
    The WCMTS 28 may decide that it needs to use three of the four RF channels to keep up with Quality of Service (QoS) bandwidth requirements. Accordingly, the WCMTS 28 transmits with the PID set to X over RF channels 1, 2, and 3. During the next MPEG-TS packet time, the WCMTS 28 may decide that it only needs two RF channels worth of bandwidth and transmits with a PID set to X only over RF channels 3 and 4.
  • [0071]
    The WCM 34 looks on the four RF channels 1-4 for wideband channels with a PID=X and de-stripes the wideband data from all MPEG-TS packets having a PID=X. If another wideband channel PID value is detected, the WCM 34 combines that wideband packet with other wideband packets having a similar PID value.
  • [0072]
    This dynamic channel assignment allows the WCMTS 28 to balance the load between all the subscribers by simply choosing which and how many RF channels to stripe the wideband transport sub-channel for any given time slot. The WCMTS 28 does not need to notify the WCM a priori, as the PID information is sent in-band and is sufficient for the WCM 34 to adjust the received channels dynamically to keep up with the WCMTS transmission.
  • Wideband Channel Descriptor (WCD)
  • [0073]
    FIGS. 17 and 18 show how a Wideband Channel Descriptor (WCD) 55 is transmitted by a wideband capable CMTS 28 at periodic intervals to define the characteristics of a logical wideband downstream channel. A separate message may be transmitted for each logical wideband downstream channel that is currently available for use. The CMTS 28 generates WCDs 55 that contain the information shown in FIG. 17.
  • [0074]
    A configuration change count is incremented by one by the CMTS 28 whenever any of the values of the channel descriptors in WCD 55 change. If the value of the count in a subsequent WCD 55 remains the same, the WCMs 34 can quickly decide that the channel operating parameters have not changed, and may be able to disregard the remainder of the message.
  • [0075]
    The WCD 55 includes a MAC management header 130, a transaction ID 132 and TLVs 134 containing wideband configuration data 134 that specifies how PID 136 is used in the wideband packet header to identify the wideband channel. The TLVs 134 specifies in field 140 the number of physical RF channels used to carry the wideband channel and identifies in field 138 narrowband downstream channels associated with the wideband channel.
  • [0076]
    The TLVs 134 can include the RF table 142 that contains a sequence number 144 indicating what order the RF channel payloads are decoded by the WCMs. Center frequencies 146 indicate the frequences for each RF channel used in the wideband channel. The RF channels may be sequenced in any order and may or may not be adjacent in frequency to each other.
  • [0077]
    The WCMTS 28 and WCM 34 can support data link encryption within the wideband channels. The WCMTS 28 may or may not use the same encryption and keying for the WCM 34 used on the associated narrowband channel. The cable modems can accept the same keying on both the narrowband channel and with wideband channel, or can accept separate keying for wideband and narrowband channels.
  • Wideband Channel Acquisition
  • [0078]
    FIG. 18 shows how the WCM 34 acquires a logical wideband channel. The WCM 34 first acquires a DOCSIS narrowband channel 130A and completes ranging making an upstream channel 132 operational. The WCMTS 28 assigns a PID value to the WCM 34 and downloads the WCD 55 containing the wideband channel parameters including the frequency table 142 to the WCM 34.
  • [0079]
    The WCM 34 reads the wideband channel descriptors 55 having the assigned PID 136 (FIG. 17). The WCM 34 issues a REG-REQ 134 to the WCMTS 28 along with any WCD wideband capabilities parameters 136. After the WCM 34 receives an REG-RSP 138 back from the WCMTS 28, all downstream RF channels 130A-130N are acquired that are identified as comprising the wideband channel. A REG-ACK 140 is sent from the WCM 34 back to the WCMTS 28. The WCM 34 then starts receiving data on the assigned wideband PID.
  • [0080]
    The WCMTS 28 can periodically reassign different wideband perameters to one or more of the wideband cable modems 34. For example, the WCMTS 28 may send a wideband channel descriptor 55 to a WCM 34 lists a first set of RF channels in a first sequence for the WCM's wideband channel. Some time later, the WCMTS 28 may send another wideband channel desciptor 55 having the same associated PID value but that contains a different set of RF channels to be used as wideband or narrowband channels or that lists the same set of RF channels in a different order.
  • [0081]
    The WCMTS 28 can use the wideband channel descriptors 55 to dynamically send different wideband configuration data to particular WCMs 34 based on changing bandwidth requirements. For example, at different times there can be different wideband and narrowband payload demands. The WCMTS 28 uses the wideband channel descriptor 55 to dynamically reassign the RF channels to different wideband and narrowband channels according to these changing bandwidth demands.
  • [0082]
    The dynamic assignment of RF channels can also be used to increase system reliability. For example, the WCMTS or WCM may identify faults in one or more RF channels. The WCMTS can then send a wideband channel descriptor 55 containing a new RF table to the WCMs using the RF channels identified with faults. The new RF table dynamically drops the identifed RF channels from the wideband or narrowband channels.
  • [0083]
    A CM without wideband capabilities may not recognize any of the new wideband-specific TLVs 134 in the WCD 55. The CM may be unable to register successfully if provisioned with the WCD 55 that contains wideband-specific parameters. When interoperating with a CM that does not have wideband-specific capabilities, the WCMTS 28 would allow a CM to register and operate as a CM. When WCM 34 registers with the WCMTS 28, the WCMTS 28 may return the REG-RESP message 138 that configures the WCM 34 in a mode with or without wideband-specific capabilities.
  • [0084]
    When interoperating with a WCMTS 28, a CM without wideband-specific capabilities receives data on a single RF channel 130A. When interoperating with a CMTS without wideband-specific capabilities, a WCM 34 receives data on a single RF channel 130A.
  • Packet Skew
  • [0085]
    Wideband MPEG-TS packet skew is defined to be the maximum expected skew from the arrival of the first MPEG-TS packet with a given VAI to the arrival of the last MPEG-TS packet with the same VAI within a given wideband channel. The skew is measured at the WCM receiver MAC interface to the PHY.
  • [0086]
    The MPEG-TS packets that make up a wideband channel are de-skewed using the VAI in the wideband MPEG header 74 (FIGS. 6-9). The MPEG-TS packets with PID values other than those defined to be wideband PIDs, including narrowband packets (PID=DOCSIS PID) and MPEG-TS nulls, will not contain valid VAIs. If the WCM 34 does not receive an MPEG-TS packet for a given VAI within the specified maximum skew window for any given RF channel of the wideband channel, the WCM 34 concludes no wideband MPEG-TS packet was sent on that RF channel for the given VAI.
  • [0087]
    Alternatively, the next consecutive CC for that PID may be received in another VAI packet slot. The WCM 34 may then conclude that no wideband packet for that PID was sent in the previous VAI packet slot.
  • [0088]
    The system described above can use dedicated processor systems, micro controllers, programmable logic devices, or microprocessors that perform some or all of the operations. Some of the operations described above may be implemented in software and other operations may be implemented in hardware.
  • [0089]
    For the sake of convenience, the operations are described as various interconnected functional blocks or distinct software modules. This is not necessary, however, and there may be cases where these functional blocks or modules are equivalently aggregated into a single logic device, program or operation with unclear boundaries. In any event, the functional blocks and software modules or features of the flexible interface can be implemented by themselves, or in combination with other operations in either hardware or software.
  • [0090]
    Having described and illustrated the principles of the invention in a preferred embodiment thereof, it should be apparent that the invention may be modified in arrangement and detail without departing from such principles. I claim all modifications and variation coming within the spirit and scope of the following claims.

Claims (20)

  1. 1. An apparatus, comprising:
    a wideband cable modem configured to receive and decode a logical wideband channel received over a plurality of downstream Quadrature Amplitude Modulation (QAM) channels, wherein the logical wideband channel spans across a first combination of some of the QAM channels at a first time and a second different combination of some of the QAM channels at a second later time; and
    the wideband cable modem configured to monitor all the QAM channels for packets having a particular packet identifier value that correlates said packets to the logical wideband channel, to track dynamic utilization of the QAM channels by the logical wideband channel over the different times according to the monitoring;
    wherein the correlated packets include Vertical Alignment Indexes (VAIs) to identify temporal positions of said packets in the plurality of QAM channels, and wherein the wideband cable modem is configured to use the VAIs to temporally realign the packets received over the different QAM channels.
  2. 2. The apparatus of claim 1, wherein the wideband cable modem is configured to inspect Moving Picture Experts Group (MPEG) Packet IDentifier (PID) fields for the particular packet identifier value to distinguish the packets of the logical wideband channel from other packets received over the QAM channels.
  3. 3. The apparatus of claim 1, wherein ones of the packets associated with a first transmit time have a same VAI value that is different than a VAI value of those ones of the packets associated with a second different transmit time.
  4. 4. The apparatus of claim 1, wherein the wideband cable modem includes a plurality of tuners having demodulators each configured to demodulate a different one of the QAM channels.
  5. 5. The apparatus of claim 1, wherein the wideband cable modem is configured to identify the QAM channels according to a received wideband channel descriptor.
  6. 6. The apparatus of claim 1, wherein the wideband cable modem is configured to use the same QAM channels for decoding both the logical wideband channel and a narrowband channel.
  7. 7. The apparatus of claim 1, wherein the received packets have an MPEG header, a wideband header and a Data Over Cable Service Interface Specification (DOCSIS) payload that contains Media Access Control (MAC) frames.
  8. 8. The apparatus of claim 1, wherein the wideband cable modem is configured to inspect continuity values to the packets that identify an order that the packets are transmitted over the different QAM channels.
  9. 9. A method, comprising:
    receiving and decoding a logical wideband channel received over a plurality of downstream channels, wherein the logical wideband channel spans across a first combination of some of the downstream channels at a first time and a second different combination of some of the downstream channels at a second later time; and
    monitoring all the downstream channels for packets having a particular packet identifier value that correlates said packets to the logical wideband channel, to track dynamic utilization of the downstream channels by the logical wideband channel over the different times according to the monitoring;
    wherein the correlated packets include Vertical Alignment Indexes (VAIs) to identify temporal positions of said packets in the plurality of downstream channels, and wherein the method further comprises using the VAIs to temporally realign the packets received over the different downstream channels.
  10. 10. The method of claim 9, further comprising inspecting Moving Picture Experts Group (MPEG) Packet IDentifier (PID) fields for the particular packet identifier value to distinguish the packets of the logical wideband channel from other packets received over the downstream channels.
  11. 11. The method of claim 9, wherein ones of the packets associated with a first transmit time have a same VAI value that is different than a VAI value of those ones of the packets associated with a second different transmit time.
  12. 12. The method of claim 9, further comprising demodulating the downstream channels using a plurality of tuners.
  13. 13. The method of claim 9, further comprising identifying the downstream channels according to a received wideband channel descriptor.
  14. 14. The method of claim 9, further comprising using the same downstream channels for decoding both the logical wideband channel and a narrowband channel.
  15. 15. The method of claim 9, wherein the received packets have an MPEG header, a wideband header and a Data Over Cable Service Interface Specification (DOCSIS) payload that contains Media Access Control (MAC) frames.
  16. 16. The method of claim 9, further comprising inspecting continuity values to the packets that identify an order that the packets are transmitted over the different downstream channels.
  17. 17. An article of manufacture including a tangible computer-readable medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to perform operations comprising:
    receiving and decoding a logical wideband channel received over a plurality of downstream channels, wherein the logical wideband channel spans across a first combination of some of the downstream channels at a first time and a second different combination of some of the downstream channels at a second later time; and
    monitoring all the downstream channels for packets having a particular packet identifier value that correlates said packets to the logical wideband channel, to track dynamic utilization of the downstream channels by the logical wideband channel over the different times according to the monitoring;
    wherein the correlated packets include Vertical Alignment Indexes (VAIs) to identify temporal positions of said packets in the plurality of downstream channels, and wherein the operations further comprise using the VAIs to temporally realign the packets received over the different downstream channels.
  18. 18. The article of manufacture of claim 17, wherein the operations include inspecting Moving Picture Experts Group (MPEG) Packet IDentifier (PID) fields for the particular packet identifier value to distinguish the packets of the logical wideband channel from other packets received over the downstream channels.
  19. 19. The article of manufacture of claim 17, wherein the operations include demodulating the downstream channels using a plurality of tuners.
  20. 20. The article of manufacture of claim 17, wherein the operations include inspecting continuity values to the packets that identify an order that the packets are transmitted over the different downstream channels.
US12853220 2003-02-04 2010-08-09 Wideband cable system Abandoned US20100316104A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10358416 US7782898B2 (en) 2003-02-04 2003-02-04 Wideband cable system
US12853220 US20100316104A1 (en) 2003-02-04 2010-08-09 Wideband cable system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12853220 US20100316104A1 (en) 2003-02-04 2010-08-09 Wideband cable system

Publications (1)

Publication Number Publication Date
US20100316104A1 true true US20100316104A1 (en) 2010-12-16

Family

ID=32849575

Family Applications (3)

Application Number Title Priority Date Filing Date
US10358416 Active 2027-11-20 US7782898B2 (en) 2003-02-04 2003-02-04 Wideband cable system
US12853220 Abandoned US20100316104A1 (en) 2003-02-04 2010-08-09 Wideband cable system
US12854009 Active 2024-01-03 US8457156B2 (en) 2003-02-04 2010-08-10 Wideband cable system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10358416 Active 2027-11-20 US7782898B2 (en) 2003-02-04 2003-02-04 Wideband cable system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12854009 Active 2024-01-03 US8457156B2 (en) 2003-02-04 2010-08-10 Wideband cable system

Country Status (4)

Country Link
US (3) US7782898B2 (en)
CN (1) CN1748389B (en)
CA (3) CA2971742A1 (en)
WO (1) WO2004070582A3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110051753A1 (en) * 2003-02-04 2011-03-03 Cisco Technology, Inc. Wideband cable system
US20110072474A1 (en) * 2009-09-24 2011-03-24 Cisco Technology, Inc. Selective Defragmentation of Quadrature Amplitude Modulators
US20130101071A1 (en) * 2011-10-19 2013-04-25 Comcast Cable Communications, Llc Signal monitoring platform
US20160134908A1 (en) * 2013-06-19 2016-05-12 Lg Electronics Inc. Broadcasting transmission/reception apparatus and broadcasting transmission/reception method

Families Citing this family (104)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7639617B2 (en) * 2001-06-27 2009-12-29 Cisco Technology, Inc. Upstream physical interface for modular cable modem termination system
US7209442B1 (en) * 2001-06-27 2007-04-24 Cisco Technology, Inc. Packet fiber node
US7688828B2 (en) * 2001-06-27 2010-03-30 Cisco Technology, Inc. Downstream remote physical interface for modular cable modem termination system
US7324515B1 (en) 2002-03-27 2008-01-29 Cisco Technology, Inc. Proxy addressing scheme for cable networks
US7023871B2 (en) * 2003-05-28 2006-04-04 Terayon Communication Systems, Inc. Wideband DOCSIS on catv systems using port-trunking
US7583704B1 (en) 2003-06-10 2009-09-01 Carl Walker Synchronizing separated upstream and downstream channels of cable modem termination systems
US7065144B2 (en) * 2003-08-27 2006-06-20 Qualcomm Incorporated Frequency-independent spatial processing for wideband MISO and MIMO systems
US7920502B2 (en) * 2003-09-10 2011-04-05 Gilat Satellite Networks, Ltd. Satellite telephony packetization techniques
US7349436B2 (en) 2003-09-30 2008-03-25 Intel Corporation Systems and methods for high-throughput wideband wireless local area network communications
US9226308B2 (en) 2003-10-15 2015-12-29 Qualcomm Incorporated Method, apparatus, and system for medium access control
US8233462B2 (en) 2003-10-15 2012-07-31 Qualcomm Incorporated High speed media access control and direct link protocol
US8462817B2 (en) 2003-10-15 2013-06-11 Qualcomm Incorporated Method, apparatus, and system for multiplexing protocol data units
US8472473B2 (en) 2003-10-15 2013-06-25 Qualcomm Incorporated Wireless LAN protocol stack
US8842657B2 (en) 2003-10-15 2014-09-23 Qualcomm Incorporated High speed media access control with legacy system interoperability
US8483105B2 (en) 2003-10-15 2013-07-09 Qualcomm Incorporated High speed media access control
US8284752B2 (en) 2003-10-15 2012-10-09 Qualcomm Incorporated Method, apparatus, and system for medium access control
US7818018B2 (en) 2004-01-29 2010-10-19 Qualcomm Incorporated Distributed hierarchical scheduling in an AD hoc network
US8903440B2 (en) 2004-01-29 2014-12-02 Qualcomm Incorporated Distributed hierarchical scheduling in an ad hoc network
US7504968B2 (en) * 2004-02-13 2009-03-17 Hewlett-Packard Development Company, L.P. Media data decoding device
US8315271B2 (en) 2004-03-26 2012-11-20 Qualcomm Incorporated Method and apparatus for an ad-hoc wireless communications system
US7809011B2 (en) * 2004-04-05 2010-10-05 Broadcom Corporation Method and apparatus for establishing communication between entities in a communication system
US8351468B2 (en) 2004-04-05 2013-01-08 Broadcom Corporation Method and apparatus for downloading content using channel bonding
US7564814B2 (en) 2004-05-07 2009-07-21 Qualcomm, Incorporated Transmission mode and rate selection for a wireless communication system
US7630361B2 (en) * 2005-05-20 2009-12-08 Cisco Technology, Inc. Method and apparatus for using data-over-cable applications and services in non-cable environments
US7835274B2 (en) * 2004-05-25 2010-11-16 Cisco Technology, Inc. Wideband provisioning
US7539208B2 (en) * 2004-05-25 2009-05-26 Cisco Technology, Inc. Timing system for modular cable modem termination system
US7817553B2 (en) * 2004-05-25 2010-10-19 Cisco Technology, Inc. Local area network services in a cable modem network
US7720101B2 (en) * 2004-05-25 2010-05-18 Cisco Technology, Inc. Wideband cable modem with narrowband circuitry
US7864686B2 (en) * 2004-05-25 2011-01-04 Cisco Technology, Inc. Tunneling scheme for transporting information over a cable network
US7646786B2 (en) * 2004-05-25 2010-01-12 Cisco Technology, Inc. Neighbor discovery in cable networks
US7532627B2 (en) * 2004-05-25 2009-05-12 Cisco Technology, Inc. Wideband upstream protocol
US8102854B2 (en) 2004-05-25 2012-01-24 Cisco Technology, Inc. Neighbor discovery proxy with distributed packet inspection scheme
US8149833B2 (en) * 2004-05-25 2012-04-03 Cisco Technology, Inc. Wideband cable downstream protocol
US8401018B2 (en) 2004-06-02 2013-03-19 Qualcomm Incorporated Method and apparatus for scheduling in a wireless network
US9722850B2 (en) * 2004-08-09 2017-08-01 Arris Enterprises Llc Method and system for transforming video streams using a multi-channel flow-bonded traffic stream
WO2006020559A3 (en) * 2004-08-09 2007-03-01 Arris Int Inc Very high speed cable modem for increasing bandwidth
US7792034B2 (en) * 2004-10-29 2010-09-07 Broadcom Corporation Hierarchical flow-level multi-channel communication
US7970010B2 (en) 2004-12-10 2011-06-28 Broadcom Corporation Upstream channel bonding in a cable communications system
US7701938B1 (en) 2004-12-13 2010-04-20 Cisco Technology, Inc. Advanced multicast support for cable
US9723267B2 (en) * 2004-12-15 2017-08-01 Time Warner Cable Enterprises Llc Method and apparatus for wideband distribution of content
US8522293B2 (en) 2004-12-15 2013-08-27 Time Warner Cable Enterprises Llc Method and apparatus for high bandwidth data transmission in content-based networks
US20060146861A1 (en) * 2004-12-20 2006-07-06 Ryuji Maeda System and Method for Communication over a Network with Extended Frequency Range
US7602820B2 (en) 2005-02-01 2009-10-13 Time Warner Cable Inc. Apparatus and methods for multi-stage multiplexing in a network
US8028322B2 (en) 2005-03-14 2011-09-27 Time Warner Cable Inc. Method and apparatus for network content download and recording
US7961754B2 (en) 2005-07-26 2011-06-14 Electronics And Telecommunications Research Institute Apparatus and method for multimedia data transmission and reception in cable network using broadband and physical layer frame structure
US8600336B2 (en) 2005-09-12 2013-12-03 Qualcomm Incorporated Scheduling with reverse direction grant in wireless communication systems
US7889765B2 (en) * 2005-11-30 2011-02-15 Time Warner Cable Inc. Apparatus and methods for utilizing variable rate program streams in a network
US7701951B2 (en) * 2006-03-06 2010-04-20 Cisco Technology, Inc. Resource reservation and admission control for IP network
US7898967B2 (en) 2006-03-22 2011-03-01 Broadcom Corporation Multiple upstream channel descriptor messages pointing to single upstream channel ID for more efficient operation of a DOCSIS system
US9088355B2 (en) 2006-03-24 2015-07-21 Arris Technology, Inc. Method and apparatus for determining the dynamic range of an optical link in an HFC network
WO2007112298A3 (en) 2006-03-24 2008-03-06 Michael J Cooper Method and apparatus for configuring logical channels in a network
US7610046B2 (en) 2006-04-06 2009-10-27 Adc Telecommunications, Inc. System and method for enhancing the performance of wideband digital RF transport systems
US8280982B2 (en) 2006-05-24 2012-10-02 Time Warner Cable Inc. Personal content server apparatus and methods
US9386327B2 (en) 2006-05-24 2016-07-05 Time Warner Cable Enterprises Llc Secondary content insertion apparatus and methods
US8024762B2 (en) 2006-06-13 2011-09-20 Time Warner Cable Inc. Methods and apparatus for providing virtual content over a network
US8255682B2 (en) * 2006-07-27 2012-08-28 Cisco Technology, Inc. Early authentication in cable modem initialization
US7957305B2 (en) * 2006-08-16 2011-06-07 Cisco Technology, Inc. Hierarchical cable modem clone detection
US7865727B2 (en) * 2006-08-24 2011-01-04 Cisco Technology, Inc. Authentication for devices located in cable networks
US8537972B2 (en) 2006-12-07 2013-09-17 General Instrument Corporation Method and apparatus for determining micro-reflections in a network
KR101367203B1 (en) * 2007-02-15 2014-02-28 삼성전자주식회사 Digital broadcasting transmission/reception apparatus and method
US8181206B2 (en) 2007-02-28 2012-05-15 Time Warner Cable Inc. Personal content server apparatus and methods
US8270434B2 (en) * 2007-03-12 2012-09-18 Broadcom Corporation Method and system for reducing transceiver power via a variable number of channels
US20080240225A1 (en) * 2007-03-27 2008-10-02 Adc Telecommunications, Inc. Method and system for enhancing the performance of wideband digital rf transport systems
US7773594B2 (en) * 2007-07-11 2010-08-10 Cisco Technology, Inc. Transferring DOCSIS frames using a label switching network
US8625607B2 (en) 2007-07-24 2014-01-07 Time Warner Cable Enterprises Llc Generation, distribution and use of content metadata in a network
US8351368B2 (en) * 2007-10-05 2013-01-08 Entropic Communications, Inc. Method for extended rate/range communication over a communication network
US9413632B2 (en) 2007-10-05 2016-08-09 Entropic Communications, Llc Method for extended rate/range communication over a communication network
KR100923163B1 (en) * 2007-10-25 2009-10-23 한국전자통신연구원 Apparatus and method of channel bonding receiving for expanding a channel bonding receiving band
KR100897158B1 (en) 2007-12-03 2009-05-14 한국전자통신연구원 Multi-channel tuning receiver apparatus and multi-channel tuning method thereof
US8300541B2 (en) * 2008-02-19 2012-10-30 Time Warner Cable Inc. Apparatus and methods for utilizing statistical multiplexing to ensure quality of service in a network
US9503691B2 (en) 2008-02-19 2016-11-22 Time Warner Cable Enterprises Llc Methods and apparatus for enhanced advertising and promotional delivery in a network
US8797854B2 (en) * 2008-09-29 2014-08-05 Cisco Technology, Inc. Scheduling for RF over fiber optic cable [RFoG]
US7889721B2 (en) * 2008-10-13 2011-02-15 General Instrument Corporation Selecting an adaptor mode and communicating data based on the selected adaptor mode
US9203638B2 (en) * 2008-11-11 2015-12-01 Arris Enterprises, Inc. CMTS plant topology fault management
US8160098B1 (en) * 2009-01-14 2012-04-17 Cisco Technology, Inc. Dynamically allocating channel bandwidth between interfaces
US8830843B2 (en) * 2009-02-27 2014-09-09 Cisco Technology, Inc. Wideband fault correlation system
US8861546B2 (en) * 2009-03-06 2014-10-14 Cisco Technology, Inc. Dynamically and fairly allocating RF channel bandwidth in a wideband cable system
US9094713B2 (en) 2009-07-02 2015-07-28 Time Warner Cable Enterprises Llc Method and apparatus for network association of content
US8516532B2 (en) * 2009-07-28 2013-08-20 Motorola Mobility Llc IP video delivery using flexible channel bonding
US8526485B2 (en) 2009-09-23 2013-09-03 General Instrument Corporation Using equalization coefficients of end devices in a cable television network to determine and diagnose impairments in upstream channels
US8923131B2 (en) * 2010-02-16 2014-12-30 Broadcom Corporation Traffic management in a multi-channel system
US8582551B2 (en) 2010-05-26 2013-11-12 Intel Corporation Device, system and method of wireless communication over non-contiguous channels
US8654640B2 (en) 2010-12-08 2014-02-18 General Instrument Corporation System and method for IP video delivery using distributed flexible channel bonding
KR101221398B1 (en) 2010-12-31 2013-01-11 엘지이노텍 주식회사 Modem for Radio Frequency including Tuner and display apparatus including thereof
US8649421B2 (en) 2011-02-18 2014-02-11 Jds Uniphase Corporation Cable modem for network measurements
US8937992B2 (en) 2011-08-30 2015-01-20 General Instrument Corporation Method and apparatus for updating equalization coefficients of adaptive pre-equalizers
US8576705B2 (en) 2011-11-18 2013-11-05 General Instrument Corporation Upstream channel bonding partial service using spectrum management
US9113181B2 (en) 2011-12-13 2015-08-18 Arris Technology, Inc. Dynamic channel bonding partial service triggering
KR101336189B1 (en) * 2012-02-03 2013-12-05 주식회사 씨제이헬로비전 Apparatus and method for changing channel in cable modem
US8701152B2 (en) * 2012-03-11 2014-04-15 Broadcom Corporation Cross layer coordinated channel bonding
US8837302B2 (en) 2012-04-27 2014-09-16 Motorola Mobility Llc Mapping a network fault
US8867371B2 (en) 2012-04-27 2014-10-21 Motorola Mobility Llc Estimating physical locations of network faults
US9003460B2 (en) 2012-04-27 2015-04-07 Google Technology Holdings LLC Network monitoring with estimation of network path to network element location
US8868736B2 (en) 2012-04-27 2014-10-21 Motorola Mobility Llc Estimating a severity level of a network fault
US9065731B2 (en) 2012-05-01 2015-06-23 Arris Technology, Inc. Ensure upstream channel quality measurement stability in an upstream channel bonding system using T4 timeout multiplier
US8781052B2 (en) * 2012-06-21 2014-07-15 Intel Corporation Physical layer channel synchronization method for high bit-rate cable transmissions
US9136943B2 (en) 2012-07-30 2015-09-15 Arris Technology, Inc. Method of characterizing impairments detected by equalization on a channel of a network
US9137164B2 (en) 2012-11-15 2015-09-15 Arris Technology, Inc. Upstream receiver integrity assessment for modem registration
US9203639B2 (en) 2012-12-27 2015-12-01 Arris Technology, Inc. Dynamic load balancing under partial service conditions
US20160254841A1 (en) * 2013-03-11 2016-09-01 Entropic Communications, Llc Synchronized multi-channel access system
US9197886B2 (en) 2013-03-13 2015-11-24 Arris Enterprises, Inc. Detecting plant degradation using peer-comparison
US9042236B2 (en) 2013-03-15 2015-05-26 Arris Technology, Inc. Method using equalization data to determine defects in a cable plant
US9025469B2 (en) 2013-03-15 2015-05-05 Arris Technology, Inc. Method for estimating cable plant topology
US9634874B2 (en) * 2015-01-16 2017-04-25 Vixs Systems Inc. Bonded OFDM communication system

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592480A (en) * 1995-03-13 1997-01-07 Carney; Ronald R. Wideband wireless basestation making use of time division multiple-access bus having selectable number of time slots and frame synchronization to support different modulation standards
US6229790B1 (en) * 1998-01-29 2001-05-08 Lucent Technologies Inc. Channel switching control for a communication system
US20020106017A1 (en) * 2001-02-02 2002-08-08 Dombkowski Kevin Eugene Method for transmitting signals over a cable protocol
US6434141B1 (en) * 1999-05-26 2002-08-13 Bigband Networks, Inc. Communication management system and method
US20020133618A1 (en) * 2001-03-14 2002-09-19 Desai Bhavesh N. Tunneling system for a cable data service
US20020191691A1 (en) * 2001-05-10 2002-12-19 Holborow Clive Eric Payload header suppression including removal of fields that vary in known patterns
US20030002540A1 (en) * 2001-05-14 2003-01-02 Onno Eerenberg MPEG data packet transmission through an ATM network with jitter free decoding
US20030009765A1 (en) * 2001-06-22 2003-01-09 Linden Thomas M. Multiple program burst broadcast
US20030212999A1 (en) * 2002-05-08 2003-11-13 Simin Cai System and method for providing video telephony over a cable access network infrastructure
US20040161098A1 (en) * 1998-09-25 2004-08-19 Hitachi Telecom Technologies, Ltd. DTMF signal transmission method and communication apparatus
US6842429B1 (en) * 2000-02-22 2005-01-11 Ikanos Communications, Inc Method and apparatus for synchronizing a packet based modem supporting multiple X-DSL protocols
US7126920B2 (en) * 2001-08-08 2006-10-24 General Instrument Corporation Performance of lifetest using CMTS as a proxy
US7184433B1 (en) * 2000-05-26 2007-02-27 Bigband Networks, Inc. System and method for providing media content to end-users
US7349430B1 (en) * 2001-06-27 2008-03-25 Cisco Technology, Inc. Addressing scheme implemented in access networks
US20080095083A1 (en) * 2001-09-18 2008-04-24 Sorenson Donald C Multi-carrier frequency-division multiplexing (fdm) architecture for high speed digital service

Family Cites Families (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5918019A (en) 1996-07-29 1999-06-29 Cisco Technology, Inc. Virtual dial-up protocol for network communication
US5982748A (en) * 1996-10-03 1999-11-09 Nortel Networks Corporation Method and apparatus for controlling admission of connection requests
US6137793A (en) 1997-12-05 2000-10-24 Com21, Inc. Reverse path multiplexer for use in high speed data transmissions
US6999414B2 (en) * 1999-10-27 2006-02-14 Broadcom Corporation System and method for combining requests for data bandwidth by a data provider for transmission of data over an asynchronous communication medium
EP1232604B1 (en) * 1999-11-16 2003-10-15 Broadcom Corporation Method and network switch with data serialization using hazard-free multilevel glitchless multiplexing
US6819682B1 (en) 1999-09-03 2004-11-16 Broadcom Corporation System and method for the synchronization and distribution of telephony timing information in a cable modem network
US7065779B1 (en) 1999-10-13 2006-06-20 Cisco Technology, Inc. Technique for synchronizing multiple access controllers at the head end of an access network
US7149223B2 (en) 2000-03-06 2006-12-12 Juniper Networks, Inc. Enhanced fiber nodes with CMTS capability
US7274679B2 (en) 2000-06-22 2007-09-25 Mati Amit Scalable virtual channel
KR100672400B1 (en) 2000-11-20 2007-01-23 엘지전자 주식회사 Apparatus and method for configuration file downloading in cable modem
US7110398B2 (en) 2001-01-12 2006-09-19 Broadcom Corporation Packet tag for support of remote network function/packet classification
US7174452B2 (en) 2001-01-24 2007-02-06 Broadcom Corporation Method for processing multiple security policies applied to a data packet structure
US6993353B2 (en) 2001-03-14 2006-01-31 At&T Corp. Cable data service method
US6993050B2 (en) 2001-03-14 2006-01-31 At&T Corp. Transmit and receive system for cable data service
US7292578B1 (en) * 2001-06-19 2007-11-06 Cisco Technology, Inc. Flexible, high performance support for QoS on an arbitrary number of queues
US7139923B1 (en) 2001-06-27 2006-11-21 Cisco Technology, Inc. Technique for synchronizing network devices in an access data network
US7639617B2 (en) 2001-06-27 2009-12-29 Cisco Technology, Inc. Upstream physical interface for modular cable modem termination system
US7218901B1 (en) * 2001-09-18 2007-05-15 Scientific-Atlanta, Inc. Automatic frequency control of multiple channels
US7782898B2 (en) 2003-02-04 2010-08-24 Cisco Technology, Inc. Wideband cable system
US7023871B2 (en) 2003-05-28 2006-04-04 Terayon Communication Systems, Inc. Wideband DOCSIS on catv systems using port-trunking
US8351468B2 (en) * 2004-04-05 2013-01-08 Broadcom Corporation Method and apparatus for downloading content using channel bonding
US8149833B2 (en) 2004-05-25 2012-04-03 Cisco Technology, Inc. Wideband cable downstream protocol
US7539208B2 (en) 2004-05-25 2009-05-26 Cisco Technology, Inc. Timing system for modular cable modem termination system
US7532627B2 (en) 2004-05-25 2009-05-12 Cisco Technology, Inc. Wideband upstream protocol
WO2006020559A3 (en) * 2004-08-09 2007-03-01 Arris Int Inc Very high speed cable modem for increasing bandwidth
US7792034B2 (en) * 2004-10-29 2010-09-07 Broadcom Corporation Hierarchical flow-level multi-channel communication
US7751850B2 (en) * 2005-09-01 2010-07-06 Broadcom Corporation Single chip multimode baseband processing circuitry with a shared radio interface
GB0517843D0 (en) * 2005-09-02 2005-10-12 Pace Micro Tech Plc Flexible data partitioning in systems using wideband channel bonding modems
US7983295B2 (en) * 2005-10-28 2011-07-19 Broadcom Corporation Optimizing packet queues for channel bonding over a plurality of downstream channels of a communications management system
US8218440B2 (en) * 2006-01-26 2012-07-10 Broadcom Corporation High speed transmission protocol
US7562168B1 (en) * 2008-05-29 2009-07-14 International Business Machines Corporation Method of optimizing buffer usage of virtual channels of a physical communication link and apparatuses for performing the same
US8762517B2 (en) * 2008-12-30 2014-06-24 Comcast Cable Communications, Llc System and method for managing a broadband network
US8160098B1 (en) * 2009-01-14 2012-04-17 Cisco Technology, Inc. Dynamically allocating channel bandwidth between interfaces
US8861546B2 (en) * 2009-03-06 2014-10-14 Cisco Technology, Inc. Dynamically and fairly allocating RF channel bandwidth in a wideband cable system

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592480A (en) * 1995-03-13 1997-01-07 Carney; Ronald R. Wideband wireless basestation making use of time division multiple-access bus having selectable number of time slots and frame synchronization to support different modulation standards
US6229790B1 (en) * 1998-01-29 2001-05-08 Lucent Technologies Inc. Channel switching control for a communication system
US20040161098A1 (en) * 1998-09-25 2004-08-19 Hitachi Telecom Technologies, Ltd. DTMF signal transmission method and communication apparatus
US6434141B1 (en) * 1999-05-26 2002-08-13 Bigband Networks, Inc. Communication management system and method
US6842429B1 (en) * 2000-02-22 2005-01-11 Ikanos Communications, Inc Method and apparatus for synchronizing a packet based modem supporting multiple X-DSL protocols
US7184433B1 (en) * 2000-05-26 2007-02-27 Bigband Networks, Inc. System and method for providing media content to end-users
US20020106017A1 (en) * 2001-02-02 2002-08-08 Dombkowski Kevin Eugene Method for transmitting signals over a cable protocol
US20020133618A1 (en) * 2001-03-14 2002-09-19 Desai Bhavesh N. Tunneling system for a cable data service
US20020191691A1 (en) * 2001-05-10 2002-12-19 Holborow Clive Eric Payload header suppression including removal of fields that vary in known patterns
US20030002540A1 (en) * 2001-05-14 2003-01-02 Onno Eerenberg MPEG data packet transmission through an ATM network with jitter free decoding
US20030009765A1 (en) * 2001-06-22 2003-01-09 Linden Thomas M. Multiple program burst broadcast
US7349430B1 (en) * 2001-06-27 2008-03-25 Cisco Technology, Inc. Addressing scheme implemented in access networks
US7126920B2 (en) * 2001-08-08 2006-10-24 General Instrument Corporation Performance of lifetest using CMTS as a proxy
US20080095083A1 (en) * 2001-09-18 2008-04-24 Sorenson Donald C Multi-carrier frequency-division multiplexing (fdm) architecture for high speed digital service
US20030212999A1 (en) * 2002-05-08 2003-11-13 Simin Cai System and method for providing video telephony over a cable access network infrastructure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110051753A1 (en) * 2003-02-04 2011-03-03 Cisco Technology, Inc. Wideband cable system
US8457156B2 (en) 2003-02-04 2013-06-04 Cisco Technology, Inc. Wideband cable system
US20110072474A1 (en) * 2009-09-24 2011-03-24 Cisco Technology, Inc. Selective Defragmentation of Quadrature Amplitude Modulators
US8305887B2 (en) 2009-09-24 2012-11-06 Cisco Technology, Inc. Selective defragmentation of quadrature amplitude modulators
US20130101071A1 (en) * 2011-10-19 2013-04-25 Comcast Cable Communications, Llc Signal monitoring platform
US8705639B2 (en) * 2011-10-19 2014-04-22 Comcast Cable Communications, Llc Signal monitoring platform
US20140177463A1 (en) * 2011-10-19 2014-06-26 Comcast Cable Communications, Llc Signal Monitoring Platform
US9270545B2 (en) * 2011-10-19 2016-02-23 Comcast Cable Communications, Llc Signal monitoring platform
US20160134908A1 (en) * 2013-06-19 2016-05-12 Lg Electronics Inc. Broadcasting transmission/reception apparatus and broadcasting transmission/reception method

Also Published As

Publication number Publication date Type
WO2004070582A3 (en) 2005-02-10 application
US20110051753A1 (en) 2011-03-03 application
CN1748389A (en) 2006-03-15 application
US8457156B2 (en) 2013-06-04 grant
US20040163129A1 (en) 2004-08-19 application
CN1748389B (en) 2015-04-22 grant
WO2004070582A2 (en) 2004-08-19 application
US7782898B2 (en) 2010-08-24 grant
CA2514595C (en) 2017-08-08 grant
CA2514595A1 (en) 2004-08-19 application
EP1590925A2 (en) 2005-11-02 application
CA2971726A1 (en) 2004-08-19 application
CA2971742A1 (en) 2004-08-19 application

Similar Documents

Publication Publication Date Title
US7007296B2 (en) Active cable modem outside customer premises servicing multiple customer premises
US6742187B1 (en) Upstream bandwidth allocation map (MAP)-initiated channel change method for data-over-cable systems
US7693171B2 (en) Methods and apparatus for efficient IP multicasting in a content-based network
US5892910A (en) CATV communication system for changing first protocol syntax processor which processes data of first format to second protocol syntax processor processes data of second format
US5754941A (en) Point-to-multipoint broadband services drop with multiple time slot return channel for customer premises equipment served by fiber optic telecommunication system employing STS-based transmission format containing asynchronous transfer mode cells
US6993353B2 (en) Cable data service method
US7139923B1 (en) Technique for synchronizing network devices in an access data network
US7065213B2 (en) In a subscriber network receiving digital packets and transmitting digital packets below a predetermined maximum bit rate
US7451475B1 (en) Method for delivery of narrow-cast data over digital broadcast channels
US7970010B2 (en) Upstream channel bonding in a cable communications system
US6370153B1 (en) Method and apparatus for reserving resources of one or more multiple access communication channels
US6377782B1 (en) Method and apparatus for communicating between a client device and a linear broadband network
US20030066087A1 (en) Digital transmission system having modulators remotely located from central media access control layer
US7089577B1 (en) Process for supplying video-on-demand and other requested programs and services from a headend
US6857132B1 (en) Head end multiplexer to select and transmit video-on-demand and other requested programs and services
US20070195817A1 (en) Upstream channel bonding using legacy maps in a cable communications system
US5793410A (en) Video pedestal network
US5889765A (en) Bi-directional communications network
US20020162114A1 (en) System and method for multicasting packets in a subscriber network
US5828403A (en) Method and system for selecting and receiving digitally transmitted signals at a plurality of television receivers
US7197052B1 (en) Technique for interfacing MAC and physical layers of access networks
US7324515B1 (en) Proxy addressing scheme for cable networks
US20010030785A1 (en) System and method for distributing information via a communication network
US20040045035A1 (en) Distributed cable modem termination system (CMTS) architecture
US20040045037A1 (en) Distributed cable modem termination system (CMTS) architecture implementing a media access control chip