446 results about "Metropolitan area network" patented technology

Systems and methods for connecting and configuring a communication network are described. A network includes a first router; a tie-line having a plurality of full duplex dedicated router interconnects connected to said first router; a second router connected to said plurality of full duplex dedicated router interconnects; a first user connected to said first router with a first full duplex loop; and a second user connected to said second router with a second full duplex loop. The systems and methods provide advantages in that bursty control information can be multiplexed with time sensitive laminar data.

Method and apparatus for transporting Ethernet data packets via radio frames in a wireless metropolitan area network. A terminal includes a data packet receiver for receiving data packets for communication over a wireless link wherein not every data packet has a same length; a data packet formatting apparatus for formatting the data packets according to radio frames wherein the radio frames each have a same length and wherein the data packets are formatted into the radio frames such that boundaries for the data packets are not necessarily aligned with boundaries for the radio frames; and a wireless transceiver for communicating the radio frames over the wireless link. The packets can be Fast Ethernet packets. The terminal does not convert the Ethernet data packets into a telephony communication protocol or into an asynchronous transfer mode (ATM) protocol prior to communication of the radio frames over the wireless link. The terminal can include a data packet synchronizer for synchronizing the data packets to a clock signal associated with the radio frames. The data packets can be time-division multiplexed into the radio frames. According to another aspect, a method of transporting Ethernet data packets via radio frames includes steps of receiving Ethernet data packets wherein each data packet includes a preamble and a start-of-frame delimiter, stripping off the preamble and start-of-frame delimiter, formatting the packet data according to radio frames, including appending a synch field to the packet data, and appending a length field to the packet data.

An extension of a Link Aggregation Protocol (LAP) over the network allows current Ethernet point-to-point LAPs to operate across a Metropolitan Area Network (MAN). A maximum disjoint path algorithm allows selection of a plurality of alternative end-to-end physical routes between two data terminals. These physical routes share a minimum number of nodes and physical links. End-to-end logical links are then formed by a plurality of successive physical links between nodes containing protocol compatible devices, the physical links being selected based on their physical characteristics such as bandwidth and delay. Multiple logical links can be provisioned, without dedicating, between any two data terminals over the network. The logical links provide the virtual point-to-point links that the edge LAP devices require. The extension of LAP / s over the network provides increased availability because a network failure can now be propagated to the edge of the network to allow the edge LAP devices to quickly react to the failure.

A method and system is provided in which data packets from multiple customer VLANs are forwarded over a MAN using VLAN aggregation. A layer-2 switch located at the edge of the MAN connects the customer VLANs to the MAN. The edge switch aggregates multiple customer VLANs (the “sub-VLANs”) into one provider VLAN (the “super-VLAN”). When a packet is forwarded from the sub-VLAN to the super-VLAN and vice versa, the edge switch uses modified bridge forwarding rules to exchange the customer-configured VLAN-IDs with the provider-configured VLAN-IDs before transporting the packet over the MAN. The edge switch further uses modified bridge media access control (MAC) address learning rules to isolate one customer's traffic from another's (i.e. isolate one sub-VLAN's traffic from another sub-VLAN's traffic).

A clock reconstruction mechanism for synchronous TDM communications traffic transported over asynchronous networks such as Ethernet networks. The invention is applicable to edge switches in Metropolitan Area Networks (MANs) that transport legacy TDM traffic using a Circuit Emulation Services (CES) module whereby TDM traffic is encapsulated and transported across the Ethernet network where it is de-encapsulated and clocked out to the destination. The mechanism encapsulates the input TDM data stream into Ethernet packets and inserts a network timestamp within the packet. At the destination CES, a local timestamp is generated for each received packet as it is received. The network timestamp is extracted and input along with the local timestamp to a Digital Time Locked Loop (DTLL) which is operative to accurately reconstruct the original transmit TDM clock. The filter in the DTLL performs a Least Squares Regression (LSR) algorithm and Infinite Impulse Response (IIR) filter algorithm to generate a clock control signal for adjusting the clock generated.

The present invention provides a system and method for maintaining and displaying information regarding high bandwidth telecommunication cables in metropolitan areas. The present invention allows a user to select a metropolitan area for display. The user may thereafter select one or more vendors who own high bandwidth telecommunication cables in the selected metropolitan area. A user may control the prominence of displayed cables by designating selected vendors in a prioritized list.

A system and method scales private Virtual Local Area Networks (VLANs) to a large computer network, such as a very large Metropolitan Area Network (MAN), so that the VLAN designations can be re-used across the network. In the illustrative embodiment, the MAN includes different groups of Layer 2 (L2) switches that are logically organized into Islands interconnected by an interconnect fabric. Within each Island, Customer-Equipment VLAN Identifiers (CE-VLAN IDs) are mapped to MAN Provider-Equipment VLAN IDs (PE-VLAN IDs). The PE-VLAN IDs defined within the MAN support the creation of Private VLANs. Each Private VLAN includes one Primary VLAN, one Isolated VLAN and may include one or more Community VLANs. Different PE-VLAN IDs may be used as the Primary, Isolated and Community VLANs in different Islands. Nonetheless, the Primary, Isolated and Community VLANs from all of the Islands are assigned the same Virtual Circuit IDs, which are loaded into encapsulated frames traversing the interconnect fabric, thereby maintaining the message's association with the Primary, Isolated and Community VLANs.

A residential gateway (RG) for distributing multimedia services to residential and business premises is disclosed. The RG connects multiple communication devices, such as TVs, telephones, computers, security cameras, and utility billing devices, to an Ethernet based metro / access network through either an optic fiber or a coaxial cable. The RG multiplexes upstream data from various communication devices into Ethernet frames according to the said Fixed-bandwidth Multimedia to Ethernet (FibME) protocol, and transmit the Ethernet frames through the link between the RG and the metro network. The RG also distributes the downstream data from the metro network to their corresponding destination devices in real time, also according to the said FibME protocol. The default bandwidth between the residential premise and the metro network is 100 Mbps full duplex. One Gbps or ten Gbps can be implemented based on the same FibME protocol for business applications. A Global Ethernet Addressing System (Global-HEAS) which will simplify the switch for the Ethernet systems is also disclosed.

A method and system for implementing weighted fair flow control on a metropolitan area network. Weighted fair flow control is implemented using a plurality of metro packet switches (MPS), each including a respective plurality of virtual queues and a respective plurality of per flow queues. Each MPS accepts data from a respective plurality of local input flows. Each local input flow has a respective quality of service (QoS) associated therewith. The data of the local input flows are queued using the per flow queues, with each input flow having its respective per flow queue. Each virtual queue maintains a track of the flow rate of its respective local input flow. Data is transmitted from the local input flows of each MPS across a communications channel of the network and the bandwidth of the communications channel is allocated in accordance with the QoS of each local input flow. The QoS is used to determine the rate of transmission of the local input flow from the per flow queue to the communications channel. This implements an efficient weighted bandwidth utilization of the communications channel. Among the plurality of MPS, bandwidth of the communications channel is allocated by throttling the rate at which data is transmitted from an upstream MPS with respect to the rate at which data is transmitted from a downstream MPS, thereby implementing a weighted fair bandwidth utilization of the communications channel.

The present invention discloses a sub-rate transmission method for user data services in transmission devices of a Metropolitan Area Network (MAN). The method comprises the steps of: pre-configuring each transmission device to form forwarding table items representing corresponding relationship between self-defined tags and transmission lines; after receiving a user data frame, an original transmission device nesting a self-defined tag into the user data frame according to said forwarding table items to form a self-defined data frame, then transmitting the self-defined data frame; and after receiving the self-defined data frame, a terminal transmission device determining an output port for transferring the data frame by searching the forwarding table items with the nested self-defined tag, then deleting the nested self-defined tag and sending the original user data frame to the said output port. The present invention, by nesting a self-defined tag, can greatly increase the number of Virtual Local Area Networks (VLANs) accommodated by a MAN as well as simplify the configuration of tags for user data to bring more convenience to users.

A system and method permits the creation of very-large metropolitan area networks (MANs) using Layer 2 (L2) switching technology. Different groups of L2 switches are logically organized into Islands. Connected to each Island are a plurality of customers sites, and an interconnect fabric couples the Islands together. The Islands cooperate to provide a Virtual Ethernet Connection (VEC) to each set of customer sites being coupled together. Customers identify their traffic that corresponds to a VEC by labeling or tagging it with a Customer-Equipment VLAN Identifier (CE-VLAN ID). Within each Island, the CE-VLAN ID specified by the customer's traffic (and hence the corresponding VEC) is mapped to a unique MAN Provider-Equipment VLAN ID (PE-VLAN ID). To prevent the formation of loops, the Islands run the Inter-MAN Control Protocol (IMCP), which represents a modified version of the Multiple Spanning Tree Protocol (MSTP).

The invention provides a method, a system and a device of security certificate. The method comprises the followings steps: encapsulating an empty certificate request in a protocol message of a remoteuser dial certification system (Radius) after an access controller (AC) activates the empty certificate of mobile termination (STA), sending the empty certificate request to an empty certificate server by a broad band access server (BRAS), and receiving the Radius protocol message in which a certificate result is encapsulated, returned by the empty certificate server through the BRAS; when the certificate result succeeds, authorizing the STA to be accessed to a wireless network, and permitting the STA to be accessed to a metropolitan area network after the BRAS determines the certificate result to be successful. The BRAS is fused in the empty certificate process, and the empty security certificate and the security certificate of accessing to the metropolitan area network are realized whileadopting the one-time empty certificate process. The invention has simple realization and brings user better user experience.

The invention discloses a service orchestrator-based metropolitan area network service processing method. According to the method, a service orchestrator is in butt joint with an application end and an SDN controller. The method includes the following steps that: S1, the application end submits a service request and invokes a service product in the service orchestrator; S2, the service orchestrator configures the service product with related parameters, creates a service instance, and issues an instruction to the SDN controller; S3, the SDN controller generates device configuration data according to the instruction of the orchestrator; and S4, the SDN controller sends the device configuration data to a metropolitan area network device through a NetConf protocol. With the method of the invention adopted, customized programming is performed based on user requirements; scheduling and adjustment are performed based on the traffic of an entire network; the closed management and control modeof a traditional network device is discarded; and the entire network can be rapidly deployed and constructed.

A method and apparatus for baseband transmission between a top floor unit and an outdoor unit in a terminal for a wireless metropolitan area network. A terminal for a wireless link in a metropolitan area network includes an extender device (e.g. a top floor unit) for receiving data packets from a computer network coupled to the extender device and for forwarding the data packets, and a broadcast device (e.g. an outdoor unit) coupled to the extender device for receiving the data packets from the extender device according to baseband transmission and having a wireless transceiver for communicating the data packets over the wireless link. The terminal can include a cable coupled between the extender device and the broadcast device wherein the cable comprises a twisted pair of conductors for providing the data packets from the extender device to the broadcast device. The twisted pair of conductors can be a Category 5 twisted pair of conductors. Thee broadcast device can include a microwave antenna coupled to the wireless transceiver; and a housing coupled to the microwave antenna for enclosing the wireless transceiver.

An Ethernet Metropolitan Area Network (10) provides connectivity to one or more customer premises (161, 162, 163) to packet-bases services, such as ATM, Frame Relay, or IP while advantageously providing a mechanism for assuring security and regulation of customer traffic. Upon receipt of each customer-generated information frame (20), an ingress Multi-Service Platform (MSP) (122) “tags” the frame with a customer descriptor (22′) that specifically identifies the recipient customer. In practice, the MSP tags each frame by overwriting the Virtual Local Area Network (VLAN) identifier (22) with the customer descriptor. Using the customer descriptor in each frame, a recipient Provider Edge Router (PER) (18) or ATM switch can map the information as appropriate to direct the information to the specific customer at its receiving site. In addition, the customer descriptor (22′) may also include Quality of Service (QoS) information, allowing the recipient Provider Edge Router (PER) (18) or ATM switch to afford the appropriate QoS level accordingly.

An emergency alert system for alerting DSL subscribers of imminent perils includes an alert server connected over a direct link to an edge node of a metro network for receiving an event notification, configuring from an event notification a highest priority alert message, and broadcasting the alert message to subscriber terminals over the metro network. An add multiplexer (ADM) multiplexes the alert traffic with the regular traffic onto the direct link, anthe multiplexed traffic reaches the edge node of the metro network, which is configured with a high priority policy. The edge node discards the lower priority traffic in the presence of the alert traffic and an applet installed on said subscriber terminal accepts and displays the alert message in a browser or a media player.

Method and apparatus for synchronizing Fast Ethernet data packets to radio frames in a wireless metropolitan area network. A method of synchronizing Fast Ethernet data packets to radio frames includes receiving Fast Ethernet data packets, storing packet data in a packet buffer according to a first clock signal wherein the first clock signal is derived from the data packets, retrieving the packet data from the packet buffer according to a second clock signal wherein the second clock signal is asynchronous with the first clock signal, and formatting the retrieved packet data according to radio frames. According to another aspect of the invention, a method of synchronizing radio frames to Fast Ethernet data packets includes recovering packet data for Fast Ethernet data packets from radio frames, storing packet data from the radio frames in a packet buffer according to a first clock signal synchronous with the radio frames, retrieving the packet data from the packet buffer according to a second clock signal wherein a frequency of the second clock signal is lower than a frequency of the first clock signal, and forwarding the data packets reconstructed from the radio frames. The method can also include adjusting a frequency of the second clock signal according to an amount of space available in the packet buffer, adjusting an inter-packet gap for the data packets according to an amount of space available in the packet buffer, or pausing the step of forwarding according to an amount of space available in the packet buffer.

The invention is used in the interface boards for connecting multi terminals to external network and the service single board for interconnecting the function board of video gateway. In the invention, by connecting the Ethernet interface to system Ethernet exchange network, under the control of control subnet, said system Ethernet exchange system can realizes Ethernet multicast and IP multicast. The network video monitoring access system equipped with said system can be used to establish the network video monitoring system required by all application fields such as enterprise network, metropolitan area network, communication network, IPTV and internet to provide video service.

The invention relates to a backbone network system based on quantum communication and a relay method thereof. According to the method, key relaying is performed between the access nodes of all the metropolitan area networks of the backbone network in advance according to a certain strategy so that the access nodes of all the metropolitan area networks are enabled to perform secret communication byusing the relay key; at least one server side is set for the access nodes and the relay nodes, and the access nodes periodically and automatically initiate relaying to other access nodes; the respective key management terminal of the access nodes and the relay nodes periodically reports the calculated key amount to the connected server side; and the server side respectively generates a quantum routing table and a relay routing table according to different shared key amount types and calculates the path key amount to be issued to the access nodes and the relay nodes, and each access node performs automatic relaying according to the routing table and the path key amount acquired from the server side.

The invention discloses data transmission equipment, a data transmission method and a communication system, and relates to the communication field, solving the problems of higher wireless network operation and maintenance cost and poor-quality wireless broadband business service. The data transmission equipment provided by the invention is positioned on an IP metropolitan-area network node or on an optical line terminal of a wireless access network, and comprises a first service bypass processing module and a second service bypass processing module, wherein, the first service bypass processing module is used for receiving uplink pocket service data sent by user equipment (UE), for determining that the uplink pocket service needs diversion according to the preset service diversion strategies, and for directly diverting the unlink pocket data to a public data network PDN through a preset local Gi interface; and / or the second service bypass processing module is used for directly receiving the downlink pocket service data sent to the UE by PDN from the Gi interface, for transmitting the downlink pocket service data to the UE. The embodiment of the invention can be used in wireless communication systems, such as 3G or LTE and the like.

A secure wireless local or metropolitan area network and data communications device therefor are provided, where the device transmits plain text in an encrypted message including cipher text and an initialization vector. The device may include a seed generator for performing a one-way algorithm using a secret key, a device address, and a changing reference value for generating a seed. Further, a random initialization vector (IV) generator may be included for generating a random IV, and a key encryptor may generate a key sequence based upon the seed and the random IV. Additionally, a logic circuit may be included for generating cipher text based upon the key sequence and plain text, and a wireless communications device may be connected to the logic circuit and the random IV generator for wirelessly transmitting the encrypted message.

The optimization method for P2P application in MAN comprises: a. when requiring downloading some resource, calling this P2P node as the request P2P node; b. searching the P2P index server to find out the P2P node list included the target resource, and calling as resource P2P node; c. from resource P2P node list, finding out the one with shortest distance with the request P2P node; and d. downloading target resource from one or more resource P2P nodes. Compared with prior art, this invention limits P2P flow on network edge as far as possible, can avoid network congestion led by P2P business, and fit to spread widely.

The invention provides a quantum key distribution system and method based on continuous variable measurement equipment independence. The quantum key distribution system comprises a sender Alice and a receiver Bob, and is characterized in that the receiver Bob is connected with a balance homodyne detector BHD through a wavelength division multiplexer WDM; the sender Alice is connected with the balance homodyne detector BHD at Alice and Bob ends; after a continuous wave laser device (LD) passes through an intensity modulator (IM), light pulse is formed by attenuation; Gaussian-modulation encoding of a coherent state is finished after the light pulse is processed by an amplitude modulator (AM) and a phase modulator (PM) under the control of a random number generated by a PC (Personal Computer) machine; then a result is sent to a third party Charlie; generated noises have relatively small influences on the system; influences on a safety key generation speed of the system, caused by forward transmission and backward transmission of a channel can be ignored; and advantages of a metropolitan area network based on a CV-MDIQKD quantum cryptography communication system are very obvious, and a foundation can be laid for commercialized and networked application in the future.

A system and method provide transparent LAN services in a metro-WAN environment to extend enterprise LANs over metro and wide area networks. The transparent LAN services generally provide customers with a layer two Ethernet connectivity with MAC learning capabilities.

An Ethernet Optical Area Network (EOAN) system, and methods for implementing and using such an EOAN system, are disclosed. The EOAN system may be used to improve the speed and reliability of data communications networks for small to medium-sized companies in metropolitan area networks. The EOAN system provides end-to-end Ethernet protocol, enabling professionals to have high-speed data communications in real time. The EOAN system may be generally utilized for improving data communications between branch offices, home offices, campuses, and remote sites for a wide variety of industries. The present invention preferably includes a fiber optic ring, Network Operation Center (NOC), NOC architecture components, existing client equipment, and one or more Free Space Optic (FSO) devices, microwave communication technology, and / or data switching platforms to implement high-speed Ethernet-based connections such as within a specified metropolitan area. The preferred EOAN system preferably integrates a plurality of FSO, microwave, and / or fiber optic technologies with Ethernet protocol (Fast Ethernet, Gigabit Ethernet, 10 Gigabit, etc.) to provide data connection services.

The invention discloses one method and system for one city zone Ethernet reliability process, which comprises the following steps: establishing one virtual router redundant agreement set by two business control gates and separately establishing interface device and virtual router agreement gate connection through virtual special local net; according to the process results, determining virtual router main backup business control gate and establishes business control gate and interface for process.