A communication server maintains profile information on twisted pair lines in a profile table. This profile information may be generated in a training session and then retrieved to train a modem or transceiver unit to communicate data over the associated twisted pair line using XDSL communication techniques.

Communication server apparatus and method

A serial intelligent cell (SIC) and a connection topology for local area networks using Electrically-conducting media. A local area network can be configured from a plurality of SIC's interconnected so that all communications between two adjacent SIC's is both point-to-point and bidirectional. Each SIC can be connected to one or more other SIC's to allow redundant communication paths. Communications in different areas of a SIC network are independent of one another, so that, unlike current bus topology and star topology, there is no fundamental limit on the size or extent of a SIC network. Each SIC can optionally be connected to one or more data terminals, computers, telephones, sensors, actuators, etc., to facilitate interconnectivity among such devices. Networks according to the present invention can be configured for a variety of applications, including a local telephone system, remote computer bus extender, multiplexers, PABX/PBX functionality, security systems, and local broadcasting services. The network can use dedicated wiring, as well as existing wiring as the in-house telephone or electrical wiring.

Local area network of serial intelligent cells

A linecard architecture for high speed routing of data in a communications device. This architecture provides low latency routing based on packet priority: packet routing and processing occurs at line rate (wire speed) for most operations. A packet data stream is input to the inbound receiver, which uses a small packet FIFO to rapidly accumulate packet bytes. Once the header portion of the packet is received, the header alone is used to perform a high speed routing lookup and packet header modification. The queue manager then uses the class of service information in the packet header to enqueue the packet according to the required priority. Enqueued packets are buffered in a large memory space holding multiple packets prior to transmission across the device's switch fabric to the outbound linecard. On arrival at the outbound linecard, the packet is enqueued in the outbound transmitter portion of the linecard architecture. Another large, multi-packet memory structure, as employed in the inbound queue manager, provides buffering prior to transmission onto the network.

Architecture for high speed class of service enabled linecard

A technique, system, and computer program for enhancing performance of the computers in a Web environment. This is done by creating a pool of connections between a Web server and backend data servers, reducing the overhead required for accessing the data servers and enabling the applications running on the Web server to be faster. Many different types of connections may be maintained concurrently in the pool, to similar or different data servers. A common interface to the pool is used, regardless of the type of backend data server connection, making programs which use the pool easier (and therefore less costly) to write and support. Options are defined for optimizing the number of connections in the pool.

Connection pool management for backend servers using common interface

A method is provided for blocking attacks on a private network ( 12 ). The method is implemented by a routing device ( 10 ) interconnecting the private network ( 12 ) to a public network ( 14 ). The method includes analyzing an incoming data packet from the public network ( 14 ). The incoming data packet is then matched against known patterns where the known patterns are associated with known forms of attack on the private network ( 12 ). A source of the data packet is then identified as malicious or non-malicious based upon the matching. In one embodiment, one of the known forms of attack is a denial of service attack and an associated known pattern is unacknowledged data packets. In another embodiment, one of the known forms of attack is an address spoofing attack and an associated known pattern is a data packet having a source address matching an internal address of the private network ( 12 ).

Method for blocking denial of service and address spoofing attacks on a private network

A communication server includes a modem pool (652) that comprises a plurality of XDSL modems (660). The communication server also includes a plurality of line interface modules (650). Each line interface module (650) has a plurality of inputs each coupled to a twisted pair data line and has a plurality of outputs each coupled to one of the XDSL modems (660). Each line interface module (650) operates to detect a need for data service on a requesting twisted pair data line and to couple the requesting twisted pair data line to an output associated with a selected XDSL modem (660). A controller (653) is coupled to the XDSL modems (660) and to the plurality of line interface modules (650). The controller (653) operates to select one of the XDSL modems (660) in response to a detected need for data service. The controller (653) further operates to direct the line interface module (650) to which a requesting twisted pair data line is coupled to couple the requesting twisted pair data line to the output associated with the selected XDSL modem (660).

Communication server apparatus having distributed switching and method

A communication server (58) includes a plurality of pairs of frequency agile modulators (638) and demodulators (640) each set to operate at a unique frequency and associated with a twisted pair data line (54). The communication server (58) also includes a plurality of pairs of demodulators (644) and modulators (646) that each have a designatable operation frequency and are associated with one of a plurality of XDSL modems (648). A mixer (642) operates to combine signals from the frequency agile modulators (638) and provide the combined signal to the demodulators (644). The mixer (642) further operates to combine signals from the modulators (646) and provide the combined signal to the frequency agile demodulators (640). A detector (634) operates to detect a need for data service on a selected twisted pair data line (54). The controller (636) then operates to couple the selected twisted pair data line (54) to the selected XDSL modem (648) by designating the demodulator (644) and modulator (646) pair associated with the selected XDSL modem (648) to operate at the unique frequency of the frequency agile modulator (638) and demodulator (640) associated with the selected twisted pair data line (54).

Communication server apparatus using frequency multiplexing and method

A communication server (58) using digital signal switching is provided. A plurality of twisted pair subscriber lines are split into twisted pair data lines (54) and twisted pair phone lines (52). Analog signals received on the twisted pair data lines (54) are converted into incoming parallel digital words and outgoing parallel digital words are converted into analog signals for transmission on the twisted pair data lines (54) using first converters (614) coupled to each twisted pair data line (54). The incoming parallel digital words are converted into incoming serial bit streams and outgoing serial bit streams are converted into the outgoing parallel digital words using second converters (616) coupled to the first converters (614). A need for data service is detected on a selected twisted pair data line (54), and one of the XDSL modems (620) is selected in response to detecting the need for data service. The selected XDSL modem (620) is then coupled to a second converter (616) associated with the selected twisted pair data line (54) where the selected XDSL modem (620) receives the incoming serial bit stream from and provides the outgoing serial bit stream to the associated second converter (616).

Communication server apparatus using digital signal switching and method

A communication server (58) is provided that includes a plurality of line interface units (500) each coupled to an associated twisted pair data line (54) and to an associated receive data pair (506) and transmit data pair (504). A plurality of XDSL modems (510) are coupled to associated modem receive data pairs (514) and transmit data pairs (512). A switch (502) operates to couple a selected subset of the receive data pairs (506) and transmit data pairs (504) of the line interface units (500) to the modem receive data pairs (514) and transmit data pairs (512) of the XDSL modems (510). A detector (508) operates to detect a need for data service on a receive data pair (506) of a selected line interface unit (500). A controller (80) operates to select one of the XDSL modems (510) in response to detecting the need for data service and to direct the switch (502) to couple the receive data pair (506) and transmit data pair (504) of the selected line interface unit (500) to the modem receive data pair (514) and transmit data pair (512) of the selected XDSL modem (510).

Communication server apparatus having four-wire switching interface and method

A framing pattern detector comprises a multi-stage input store, an intermediate logic operator, and a decoder. As the serial bit stream is clocked through the input store, the intermediate logic operator subjects sequentially spaced apart bits to a prescribed logic function, and transforms these bits into a transformed bit pattern having a length less than that of the framing pattern. The decoder compares the transformed bit pattern with cyclically rotated versions of a prescribed multi-bit framing pattern template. In response to a match between the transformed pattern with any of the cyclically rotated versions of the template, the decoder identifies the framing pattern. If the decoder fails to detect a match, the clocking of the serial bit stream is adjusted until the decoder identifies the framing pattern.

Clifford L. Hall

Papers

Communication server apparatus having distributed switching and method

Communication server apparatus using frequency multiplexing and method

Communication server apparatus using digital signal switching and method

Communication server apparatus having four-wire switching interface and method

Logical transform operator-based method and apparatus for extracting framing pattern from serial digital bit stream