43 results about "Plesiochronous digital hierarchy" patented technology

An apparatus for and a method of integrating switching and transferring of synchronous optical network / synchronous digital hierarchy (SONET / SDH), plesiochronous digital hierarchy (PDH), and Ethernet signals, which integrate and provide connection of synchronous digital (SONET / SDH) signals, plesiochronous digital (PDH) signals, and Ethernet signals, mutually change the synchronous digital (SONET / SDH) signals, the plesiochronous digital (PDH) signals, and the Ethernet signals, packet switching, synchronous timeslot switching, and channel configuration management and control functions in one system. Thus, packet switching capacity, timeslot switching capacity, and packet / timeslot bridging capacity can be enlarged and configured according to corresponding application. Also, a distinctive service compared to a service provided by a separate Ethernet device or a SONET / SDH network device can be provided through a packet / timeslot bridge. In addition, varied and reliable communication service at a moderate price can be provided to service users, and decreased investment and maintenance fee can be provided to carrier service providers.

A system and method are provided for transporting Plesiochronous Digital Hierarchy (PDH) tributaries. The method accepts a plurality of PDH tributaries; generates a serial data stream of interleaved PDH tributaries; generates a serial control stream of signals for recovering the PDH tributaries; and, generates a clock signal for timing the data and control streams. The serial data stream of interleaved PDH tributaries is loaded into the payload of a data frame structure. Likewise, the serial control stream is loaded into the payload of a control frame structure. The data bytes of the serial data stream and the control bytes of the serial control stream are both transmitted at the same data rate. That is, there is a control byte generated for each data byte. Thus, the control bytes in the control frame structure are aligned with corresponding data bytes in the data frame structure.

The invention refers to a method of transmitting Ethernet data frames from a first local area network (LAN) to a second local area network (LAN) comprising mapping Ethernet frames from the first local area network onto Plesiochronous Digital Hierarchy format via Generic Framing Procedure (GFP) and transmitting the mapped Ethernet frames via a one or multiple En streams to an optional SDH-level network. The transmission is received at the second local area network through the optional SDH-level network via one or multiple En streams-network, and the Ethernet frames are demapped from the first local area network via Generic Framing Procedure, and transmitted into the second local area network.

Asynchronous / plesiochronous digital hierarchy (PDH) signals, such as DS1 and E1, are transported using virtual concatenation. The packetized data signals are frame encapsulated and subsequently inverse multiplexed into a plurality of PDH frames. An overhead packet is inserted in the transmitted frames to enable the receiver to determine the status of the frames and extract the differential delay experienced by various frames as they are routed through virtually concatenated channels. The extracted delays enables the receiver to realign the various frames of the PDH signal to reconstitute the originally transmitted signals that travel through different paths of the transport network linking the source and sink of the virtually concatenated channel.

The invention discloses convergent type Ethernet over plesiochronous digital hierarchy (EoPDH) network bridge equipment and a data transmission method thereof. The transmission process of up data in the method comprises the steps that: E1 digital signals sent by n E1 interfaces of a line interface module are simultaneously received at each E1-media access control (MAC) module end, the received E1 digital signals are converted to Ethernet data packets and then are successively sent to an Ethernet exchange chip through one Ethernet interface, and the Ethernet data packets are forwarded to a server side by the Ethernet exchange chip; and the transmission process of down data comprises the steps that: when the Ethernet data packets issued by the Ethernet exchange chip are received at each E1-MAC module end, the Ethernet data packets are converted to the E1 digital signals, then are copied for n copies, and are respectively sent to the corresponding n E1 interfaces, and afterwards, the signals are processed by the line interface module and are transmitted to a client side through a transmission line. The convergent type EoPDH network bridge equipment and the data transmission method thereof have the advantages that the implementation difficulty of the equipment is reduced, FPGA (field programmable gate array) resources are saved, and more E1 access quantities can be achieved.