Abstract: A method and apparatus of processing a multicast service flow for a headend cable modem is provided. The method of processing the multicast service flow includes: classifying an inputted multicast packet by a session; composing an internal header including multicast service flow information allocated to the classified session; and outputting an internal multicast packet including the internal header.

Abstract: A method of effectively setting and changing a Receive Channel Set (RCS) of a cable modem (CM) is provided. The method includes: receiving, by a Cable Modem Termination System (CMTS), a Receive Channel Profile (RCP) with respect to a downstream physical layer of a CM; composing, by the CMTS, a plurality of channel configuration information required for setting the RCS of the CM with reference to the RCP; encoding, by the CMTS, the plurality of channel configuration information, and transmitting the encoded plurality of channel configuration information to the CM; transmitting, by the CM, an RCP with respect to a downstream physical layer to a CMTS; receiving, by the CM, a plurality of channel configuration information being composed with reference to the RCP and being required for setting the RCS; and setting, by the CM, the RCS using the plurality of channel configuration information.

Abstract: A method and apparatus of processing a multicast service flow for a headend cable modem is provided. The method of processing the multicast service flow includes: classifying an inputted multicast packet by a session; composing an internal header including multicast service flow information allocated to the classified session; and outputting an internal multicast packet including the internal header.

Abstract: An apparatus for remotely monitoring a terminal is provided which includes an analyzer to map terminal information regarding at least one management target terminal, a collection period, a cycle setting value, or an analysis item, to group the at least one management target terminal, and to store the grouped at least one management target terminal in a form of a profile, a management processor to perform a query for a Management Information Base (MIB) object requested by the at least one management target terminal conforming with a Simple Network Management Protocol (SNMP) standard, and to transmit a value of the returned MIB object to the analyzer, and an output unit to output, from a database, at least one of the analysis item, the analysis period, the terminal information, and an output format.

Abstract: Provided are an apparatus and a method for multimedia data transmission in a cable network using a broadband and physical layer frame structure. The apparatus includes an external network matching module for transmitting data inputted/outputted from/to an external network to a Data Over Cable Service Interface Specification (DOCSIS) Media Access Control (MAC) layer, a DOCSIS MAC processor for transmitting the data from the external network matching module to a corresponding destination, a first downstream physical layer processor for handling an existing standard transmission in the data from the DOCSIS MAC processor, a second downstream physical layer processor for dealing with a new broadband transmission in the data from the DOCSIS MAC processor, and an upstream physical layer processor for providing received data to the DOCSIS MAC processor.

Abstract: A method for composing a lookup table and searching indexes thereof is provided. The method includes the steps of: a) composing a lookup table using a symmetry of a sine and a cosine function; b) changing and setting a gain of a DCO by reflecting a lookup table size in the DCO; c) transforming an absolute value of a DCO output to an integer value; d) determining a range of the integer value of the DCO output; e) searching indexes of a sine and an cosine function according to the range of the integer value of the DCO output; and f) correcting a sign of a lookup table value corresponding to the searched index of the sine function and a sign of a lookup table value corresponding to the searched index of the cosine function according to the range of integers of the DCO output.

Abstract: A decision feedback equalizing apparatus selectively using a feedback filter and a method thereof are provided. The apparatus includes: an equalizing unit including a feed forward filter (FFF) for correcting a distorted transmission channel by receiving a match-filtered signal and a feedback filter (FBF) for reducing inter symbol interference ISI of the corrected transmission channel for driving only the FFF in a blind mode and driving the FFF and the FBF in a decision directed mode; a diverge/converge determining unit for determining whether the decision feedback equalizing apparatus is diverged or converged using a unit square error obtained through a least unit square algorithm; and a filter controlling unit for controlling the equalizing unit in a blind mode if the decision feedback equalizing apparatus is determined as divergence, and for controlling the equalizing unit in a decision directed mode if the decision feedback equalizing apparatus is determined as convergence.

Abstract: A timing lock detection apparatus and method for digital broadcasting receiver are provided. The apparatus includes: a discrete value generator for cyclically selecting a discrete signal value from a continuous timing error signal; a differential calculator for obtaining a difference between the currently selected timing error signal value and a previously selected timing error signal that is a timing jitter signal; a sign variation detector for detecting variation in a sign of the timing jitter signal; a lock control signal generator for discriminating a period based on the detected sign changing time, and controlling a lock step of the loop filter according to a convergence mode of the timing jitter signal at each period; and a lock detection signal generator for generating a lock signal or an unlock signal according to whether the timing jitter signal reaches a steady state and using the current lock step signal.

Abstract: Provided is a re-authentication apparatus in a Downloadable Conditional Access System (DCAS), the re-authentication apparatus includes: a receiving unit to receive a key request message from a Secure Micro (SM); a determination unit to determine whether to perform re-authentication depending on downloading of SM client image; an identification unit to identify an SM identifier using the key request message, when the re-authentication is performed as a result of the determination; an extraction unit to retrieve previous session information corresponding to the SM identifier and to extract keying information about the previous session information; and an encryption unit to control an encryption key about the SM client image to be reused, the SM client image being encrypted in a previous session based on the previous session information using the keying information.

Abstract: A Data Over Cable Service Interface Specifications (DOCSIS) frame reassembling apparatus and method in a cable modem including a plurality of receiving channels is provided. A method of controlling reassembling of a Media Access Control (MAC) frame, the method including: receiving a signal and outputting a packet signal through demodulation and error correction; receiving the outputted signal and controlling a specific compression format standard header and a point field; receiving packet data and a buffer write enable signal, and writing data in a MAC frame reassembling buffer; storing the data written in the MAC frame reassembling buffer; and reading the stored data from the MAC frame reassembling buffer in response to a received buffer read enable signal, and storing the read data in a MAC frame buffer.

Abstract: Disclosed is a downloadable conditional access system (DCAS) and an operational method thereof that distributes a part of a function of a Trusted Authority to each multiple system operator (MSO) to enable the MSO server to process authentication with respect to a secure micro (SM) chip and a transport processor (TP) chip, and thus, a normal DCAS service is possible even when there is a problem with a security, and a DCAS host terminal for rental use is effectively operated.

Abstract: Provided is a method for classifying packets in a cable modem termination system (CMTS) supporting a channel bonding mode.

Abstract: The present invention relates to a technology of paring a secure micro (SM) and a transport processor (TP) in a downloadable conditional access system (DCAS). More specifically, predetermined security components generated by a trusted authority which is a certificate authority are previously embedded into the SM and the TP, and pairing between the SM and the TP is performed by association of the security components with the TA. Accordingly, safe pairing can be assured and the leakage of security information from the SM by malicious hacking can be prevented.

Abstract: A cable modem termination system receives a bandwidth request message, and collects information on the basis of the bandwidth request message. Then, time bandwidth size information is generated on the basis of the bandwidth request message and the collected information, and a bandwidth allocation message is generated on the basis of the collected information and the time bandwidth size information. Accordingly, a cable modem termination system can effectively receive data transmitted from a cable modem.

Abstract: A packet transmission device of a physical layer receives a plurality of packets from a media access control layer that is an upper layer of the physical layer, and detects a packet including a sync message from the packets. The packet transmission device receives first time information for synchronization from the media access control layer, inserts first time information into the sync message, and transmits packets at a predetermined data rate.

Abstract: Provided is a method for providing a service based on a subscriber level. The method includes the steps of: a) initializing a Data Back-off Start (DBS) value and a Data Back-off End (DBE) value; b) acquiring subscriber information from an external management system; c) acquiring service flow identifier (SFID) and service identifier (SID) information from an object model for quality of service (QoS) based on information on Service Class Name (SCN) of the subscriber acquired in the step b); d) creating manufacturing automation protocol (MAP) according to a priority by grasping the SID information based on the service level and controlling the DBS value and the DBE value of a cable modem (CM); and e) transmitting the created MAP to the cable modem.

Abstract: Provided are an apparatus for receiving cable broadcasting programs and a multiplexer and a de-multiplexer thereof for reducing data amount processed in a Cable CARD and for correcting synchronization of descrambled data stream. The apparatus includes: a multiplexing unit for filtering a broadcasting stream to select only programs selected by a viewer and multiplexing the selected programs; a conditional-access processing unit for receiving the multiplexed streams and processing the multiplexed streams for conditional access (descrambling); and a de-multiplexing unit for de-multiplexing the multi stream from the conditional-access processing unit and correcting a program clock reference (PCR).

Abstract: A downloadable conditional access system (DCAS), a secure micro (SM), and a transport processor (TP), and a security authentication method using the same are provided. The DCAS provides a safe security environment through a security protocol which enables mutual authentication and secure channel establishment between the SM and the TP.

Abstract: A mutual authentication apparatus in a Downloadable Conditional Access System (DCAS) includes an announce protocol processor to authenticate SecurityAnnounce information using an Authentication Proxy (AP) and to transmit the authenticated SecurityAnnounce information to a Secure Micro (SM), a keying protocol processor to relay KeyRequest information and KeyResponse information between a Trusted Authority (TA) and the SM in response to the SecurityAnnounce information, a decryption unit to decrypt the KeyResponse information using the SM, an authentication protocol processor to determine whether a first encryption key of the KeyResponse information is identical to a second encryption key generated by the AP, and a download protocol processor to control DownloadInfo to be transmitted from the AP to the SM, the DownloadInfo permitting the SM to download SM Client Image information.

Abstract: Provided are a multiplexing and demultiplexing apparatus and method for delivering an MPEG-2 TS packet error signal through a CableCARD interface. In the multiplexing apparatus, a TS packet reception unit receives TS packets, and a pre-header generation unit generates pre-headers corresponding to the received TS packets. A pre-header insertion unit inserts the pre-headers in front of the received TS packets to generate cable MPEG packets (CMPs), and an output FIFO unit stores the CMPs. A FIFO control unit transfers the CMPs without collision with CMPS of different channels, and an output signal generation unit generates output signals from the CMPs of the different channels.