A method and apparatus for monitoring the performance of a dedicated communications medium in a switched data networking environment wherein a probe having a bypass circuit allows promiscuous monitoring of all traffic between a switch and a network device, such as a file server, in either direction, and in full duplex mode Additionally, the bypass circuit eliminates the requirement for a separate repeater between the switch and the network device

Method and apparatus for monitoring a dedicated communications medium in a switched data network

In accordance with the present invention, a Digital Subsciber Line (DSL) network for improving the transmission of DSL signals over a local loop (214) is disclosed. The DSL network (200) includes a loop extender (224) with communications, control, and diagnostic functionality, and a central office (202) including a Digital Subscriber Line Access Multiplexer (DSLAM) (604) and a central office controller couples to the loop extender (224) via a local loop (214) for controlling the loop extender (224).

Loop extender with communications, control, and diagnostics

A method and apparatus for monitoring the performance of a dedicated communications medium in a switched data networking environment wherein a probe having a bypass circuit allows promiscuous monitoring of all traffic between a switch and a network device, such as a file server, in either direction, and in full duplex mode. Additionally, the bypass circuit eliminates the requirement for a separate repeater between the switch and the network device.

A DSL network for improving the transmission of DSL signals includes a plurality of local loops (214, 216, 218, 220) for transmission of upstream and downstream DSL signals, control signals (202), and DC power (232), a plurality of loop extenders (224, 226, 228, 229, 230) with communications, control (202), and diagnostic functionality for amplifying the DSL signals, a loop extender communications (224, 226, 228, 229, 230)/power supply (232) for receiving the DC power (232) and control signals (202), providing DC power (323) to the plurality of loop extenders (224, 226, 228, 229, 230), and broadcasting the received control signals (202) to the plurality of loop extenders (224, 226, 228, 229, 230), and a central office controller (202)/power supply (232) for controlling access to the plurality of local loops (214, 216, 218, 220) and controlling the plurality of loop extenders (224, 226, 228, 229, 230).

Line powered loop extender with communications, control, and diagnostics

A network diagnostic device is disclosed that digitally samples the voltages on the cabling of the network (10), but does so at a much higher rate and with greater resolution than is required to minimally detect digital transmissions on the cabling. This sampling provides information on the analog characteristics of digital, noise, and interference signals on the network. Thus, network problems can be precisely diagnosed. The device includes a fast digitizer (120) with a long memory (128a, 128b) and a system processor (140) that statistically analyzes the signal events captured by the digitizer (120). The invention is also capable of performing time domain reflectometry (TDR) analysis of a functioning network. This is accomplished by placing (150) a TDR signal on the network surrounded by a transmission that the network devices will interpret as a broadcast diagnostic packet. This will cause the network nodes to ignore the transmission. The digitizer, however, is able to detect the networks' response to the TDR signal. Methods for identifying unknown network sources and Manchester decoding are also disclosed.

Packet network monitoring device

An arrangement for a token ring communications network includes nodes for transmitting and receiving data signals. Also provided is a communications medium for transporting the data signals includes a trunk circuit having a plurality of trunk segments, each trunk segment having an input end and an output end and a plurality of lobe circuits for connecting the nodes to the trunk circuit. A plurality of wiring concentrator are provided for connecting adjacent trunk segments as a ring. Each wiring concentrator having a plurality of ports including an input port connected to an input end of one of the trunk segments, an output port connected to an output end of one of the trunk segments, and a lobe port connected to one of the lobe circuits. Each wiring concentrator includes an internal trunk, a controller, and a plurality of switches for interconnecting the ports while the voltage and the frequency of the data signal are within predetermined voltage and frequency ranges.

Arrangement for a token ring communications network

An apparatus is provided for detecting the signaling frequency of communications signals transported on the trunk and lobe circuits of a token ring. The communications signals including Differentially Manchester Encoded data signals. The apparatus includes an internal trunk circuit and a plurality of ports including an input port for connecting to an input trunk segment, and an output port for connecting to an output trunk segment, and a plurality of lobe ports for connecting to the lobe circuits. Means are provided for sensing the frequency of the data signals at each of said plurality of ports. The sensing means including means for taking multiple successive timing samples, and grouping the samples into quality groups.

Signaling frequency detection for a communications network

An apparatus for controlling configuration of a communications network, the network including a trunk having trunk segments and lobe circuits for connecting to nodes. The apparatus comprises an internal trunk circuit, and a plurality of ports. The ports include a lobe port for connecting to a lobe circuit, an input port for connecting to an input trunk segment, and an output port for connecting to an output trunk segment. State machines are provided for sensing the communications signal at a corresponding one of each of said plurality of ports. Each state machines is transitioned by a set of transition rules which include inputs from the sensed communications signals. The state machines enable the connection and disconnection of said ports to said internal trunk.

State machines for configuration of a communications network

An apparatus for controlling configuration of a communications network includes an internal ring segment for interconnecting a trunk circuit with lobe circuits of the network. The apparatus is provided with lobe ports for connecting to the lobe circuits, a ring input port for connecting to an upstream ring segment of the trunk, and an output port for connecting to a downstream ring segment, of the trunk. A plurality of trunk coupling units (TCUs) are provided, one for each port, for connecting a corresponding ports to the internal ring segment. Each of the TCUs has an inserted state to provide signaling continuity for the communications signals between a port and the ring segments, and each TCU has a wrapped state to provide signaling isolation between a port and the ring segments. A controller, responsive to the communications signals switches the TCUs between the wrapped and inserted states.

Configuration controller for a communications network

An apparatus for establishing timing signals of a communications network includes a plurality of ports and an internal trunk circuit for interconnecting trunk segments and lobes of the network. A speed detection circuit connected to each of said plurality of ports, are provided for sensing a plurality of timing signals, there being one timing signals sensed at each of the plurality of ports. The apparatus establishes a timing signal on the internal trunk equal to the timing signal senses at a majority of the ports to enable a majority of the nodes connected to a majority of the plurality of lobe ports to transport communications signals via the network.

Configuration controller for establishing timing signals of a communications network

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