A system for managing and documenting a local area communications network is provided which deploys power sourcing equipment and powered devices by the use of active electronic modules, having an Ethernet controller and Power over Ethernet forwarding capabilities, as integral, managed components within the cable plant, to enhance management, documentation, security and emergency 911 aspects of the network as well as extending the physical reach of the network.

Systems and methods for managing a network

A powered communications patch panel is adapted to power network devices connected to the communications patch panel. Power is supplied to the network devices by the powered communications patch panel over the communication cabling. The powered communications patch panel may be provided with a management port to allow remote management of the patch panel via a network connection. Multiple management ports may be provided, allowing patch panels to be connected to one another in a daisy-chain configuration.

Powered patch panel

A method of handling packets includes inserting a stack-specific tag into a packet, then processing the packet in a stack of network switches in accordance with tag information in the stack-specific tag. The stack-specific tag is then removed from the packet.

Stacked network switch configuration

An network management system (NMS) architecture is disclosed that takes advantage of intelligence capable network devices for network monitoring and control. NMS functions may be distributed where possible to intelligent devices where local storage and processing may be performed. Local collection and processing of monitoring information may reduce NMS-related network traffic, permit continuing local control and operation during times of network communication disruption with the central NMS, and permit greater reliability in data collection and execution of network functions such as the enforcement of security policy at the respective intelligent devices.

Systems and methods for network management

A method of mirroring data to a mirrored to port in a plurality of switches. The method has the steps of determining if data was sent to all of said plurality of switches; determining if said data was sent to a mirrored to port (MTP); and resending said data to all of said plurality of switches if mirroring is enabled and said data was not sent to said MTP.

Mirroring in a stacked network switch configuration

A stackable network unit comprises a ‘down’ port and an ‘up’ port, an arbitration path for data packets from the down port to the up port, a repeat path for data packets from the up port to the down port, a link detector for detecting tile absence of another operative unit connected to the down port to cause data packets on the return pat to bypass the down port and proceed on the arbitration path and for detecting the absence of another operative unit connected to the up port to cause data packets on the arbitration path to bypass the up port and proceed on the repeat path.

Method and apparatus for configuration of stackable units in packet-based communications systems

A data network hub unit is stackable with other such units to constitute a hub in which each of the units can supply data packets to network data destinations and receive data packets from network data sources, and to form a closed data transmission ring which enables packets received at any unit to be transmitted from any other unit. The hub unit includes arbitration control means responsive to packet headers circulating on said ring. The arbitration control means is operative: (i) when the hub unit acts a master unit to supply data packets, to modify data packets to provide them each with an arbitration header which includes a grant field, a request priority field, capable of indicating various different level of priority, and a grant priority field; (ii) when the hub unit is acting as the master unit and has no more data packets to supply to the ring, to respond to an arbitration header which has a set priority field by setting the grant field and setting the grant priority field; (iii) when the hub unit is not the master unit but has data packets to place on the ring, to respond to arbitration headers by setting a priority field; and (iv) when the hub unit is not the master unit but has data packets to send, to respond to an arbitration header which has the grant field set and a grant priority field indicating a priority level corresponding to the priority requested by this unit to become the master unit.

Hub system with ring arbitration

A communications apparatus comprising a plurality of communication devices each having a plurality of ports and a data bus interconnecting the plurality of units, wherein each device is provided with means enabling the device to detect automatically its position on the data bus.

Communication device with circuitry to promote cascade series connection including identification of device position in the series and sensing the end device in the series

A clock selector circuit for selecting a single output clock signal from a multiplicity of input clock signals, each constituted by transitions between binary states, comprises a multiplicity of D-bistables each having a clock input coupled to receive the respective one of the input clock signals, a D-input coupled to receive a hold signal common to the bistables, and an output for providing a respective hold signal. A first multiplexer has inputs coupled to receive the respective input clock signals and is operative to select in response to the selection signal one of said input signals. A second multiplexer has inputs coupled to receive the respective hold signals and is operative to select in response to the selection signal the hold signal corresponding to the clock signal selected by the first multiplexer. A gate is coupled to receive both the clock signal selected by the first multiplexer and the hold signal selected by the second multiplexer and asserts an output whichever of the input signals to the gate may be asserted. The assertion of the common hold signal precedes a chance in state of the selection signal and endures at least until all the hold signals have been asserted and a change in state of the selection signal has occurred. The circuit facilitates glitch-free clock multiplexing.

Glitch free clock multiplexer circuit

Cascade connection of communicating devices

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