50 results about "STM-1" patented technology

The present invention provides a method for realizing transmission of multiprotocol client signals in a distributed base station subsystem, comprising: encapsulating client signals by a GFP-T frame; and mapping said GFP-T frame into a lower-layer transmission link to realize the transmission of client signals. Said lower-layer transmission link is a common public radio interface CPRI link. Said client signals are one of the following: baseband I/Q signals of WCDMA supported by CPRI protocol, baseband I/Q signals of radio interface protocols other than WCDMA, structured signals of E1/T1, STM-1 and other constant-rate links, structured variable-rate link signals such as Ethernet MAC frame signals, PPP/HDLC frame signals, etc. This method is also applicable to other types of synchronous transmission links between a remote radio unit and a primary baseband processing unit, e.g., the links as specified by OBSAI (Open Base Station Architecture Initiative).

A transport facility adapted to transport TDM bit streams using IP packets over an asynchronous Ethernet network. TDM bit streams such as E1, T1, E3, T3, OC-3, OC-12, STM-1, STM-4, etc. are received, buffered and encapsulated into Ethernet frames. The Circuit Emulation Device (CED) receives, buffers and assembles in real-time ingress data from TDM ports into Ethernet Frames and forwards them to an Ethernet interface. The TDM data is encapsulated within RTP, UDP and IP packets before being encapsulated within an Ethernet frame. In the egress direction, Ethernet frames enter the encapsulation/segmentation processor from the Ethernet port and the IP, UDP and RTP packets are extracted from the frame. TDM data is extracted and the bit streams are re-generated and forwarded to the TDM ports for transmission over legacy TDM facilities.

The SONET/SDH multiplexing hierarchy is extended to very high rates by creating new virtual containers of a higher capacity, and their associate pointers. The multiplexing hierarchy nests the pointers into the payload, so that the number of pointers on the high capacity line is importantly reduced, as the high rate spans of the network do not see the STS-1/STM-1 pointer granularity. Fewer pointers result in reducing the current complexity of pointer processing. The complexity of the multiplexing hierarchy is also reduced by the use of larger containers. The hierarchy may be extended to higher rates, as needed, and may also be used for other technologies, besides SONET/SDH.

The invention discloses a frame head detecting device and method for STM-1 structure in SDH system, which includes: data byte bit compound processing model, which is used for the recombination of byte bits, the b its width data in the device are shifted circularly into a 8 channels data flow; the frame head detecting mark model includes 8 branches, which are connected to 8 channel data, it sends out frame head pulse when detecting the frame head, it carries on frame head mark signal automatic reset when detecting the frame head mark reset signal pulse; and data frame head selecting model, which is used to select the frame head mark signal with frame head pulse and the correspondent branches' data flow output, at the same time, the unique of the frame head signal are detected, when receives several frame head mark signals, it sends out frame head mark reset signal. The invention can carry on frame head detection to STM-1 data flow after through the CDR clock restoration circuit, frequency dividing and speed conversion.

The invention provides a channelizing synchronous transport module 1(STM-1) access distribution method of and a system thereof. The method comprises: multipath optical signals in a channelizing STM-1 network are respectively converted into electrical signals; an original data stream is extracted; for pure data, an effective IP data packet is extracted according to a protocol type; the data are filtered according to a filtering rule; and the data are distributed. According to the method and the system in the invention, a demand of flexible access of multiport and multi-protocol environments can be met on the light splitting and bypass condition of a complex network environment; and a demand of network safety data processing can also be met; meanwhile, flexibly extensible property of an interface can be supported and a demand on access with high density is met.

The invention relates to a method for realizing inter-disc STM-1 interface automatic protection switching in a gigabit-capable passive optical network (GPON) system. The method comprises the following steps that: 1, an inter-disc optical line automatic protection switching function is initiated, and two STM-1 interface discs are appointed as master and backup discs respectively; 2, E1 service links are set up in the two STM-1 interface discs, wherein only the master disc carries corresponding E1 services; 3, the master and backup discs directly send Ethernet double-layered packets to each other to intercommunicate about respective states; 4, when the master disc fails, a switching operation instruction is sent in the form of the Ethernet double-layered packets to the backup disc, and the backup disc is switched into the master disc to carry the corresponding E1 services; and 5, the master and backup discs report the changed states to a network manager. According to the method of the invention, the master and backup states of the STM-1 interface discs are switched by directly sending the double-layered packets, so that the operation efficiency of the system is improved, the time delay in switching is reduced, furthermore, the high real-time requirement on time division multiplex (TDM) services is met, and the reliability of equipment and the degree of satisfaction of telecommunication operators and users are improved.

The invention discloses a method and a system for automatically recognizing an ABIS (aurora business intelligence server) signaling link, and can solve the technical problems of poor accuracy and maintainability in signaling link recognition on an existing network 2.5G transmission link. A 2.5G optical fiber needing scanning recognition of the signaling link is accessed by an optical transceiver, ABIS signaling data are collected by an STM-1 optical collection device, a signaling analysis device is used for ABIS signaling recognition, detailed signaling link information in 2.5G optical transmission is finally acquired, the signaling link is automatically recognized and screened, and accordingly, the problems of incompleteness and inaccuracy of configuration data and difficulty in maintenance of the existing network 2.5G optical transmission link are solved.

The invention discloses a device for switching a 63-path bridge service and a kilomega Ethernet port in an STM-1. the structure of the device comprises a first-level two-layer switching module, a second-level Ethernet two-layer switching module, a kilomega Ethernet electric port, a kilomega Ethernet optical port, an Ethernet over E1 and E1 mapping module, an SDH clock processing module, an STM-1 optical port, a VC4 bus and an Ethernet over E1 and E1 mapping module. The device for switching the 63-path bridge service and the kilomega Ethernet port in the STM-1 has the advantages of saving a lotof Ethernet category-5 cables and 75 omega coaxial cables, lowering the amount requirement of the Ethernet ports and E1 ports, reducing the occupation of stand space in a communication center machineroom, efficiently solving the problems of machine room wiring and maintaining difficulty caused by accessing too many cables, because 63 distal ends can be simultaneously accessed into the Ethernet over E1 bridge service only needing butt jointing a pair of optical fibers and an SDH transmission device and connecting one Ethernet category-5 cable with an Ethernet switch or a router. The inventionadopts the efficient, simple, convenient, low-cost accessing mode.

After system is initialized, electrical interface module of multiplexing 10/100/1000Mbps Ethernet, or optical interface module of multiplexing 1000Mbps Ethernet, or interface module of multiplexing ATM(over STM-1)PHY module convert data in current network to bus of media flow. Through bus of media flow, kernel process module of network processor extracts data to carry out pretreatment, sends data to switching module of Ethernet. Based on coincidence relation between kernel process module of network processor and module of main processor, the method forwards pretreated data to corresponding module of main processor, and carries out advanced treatment for received pretreated data. Introducing newest network processor to the interface module of monitoring system for communication protocol, the invention raises processing power of interface module, and enhances processing power of main processor module on large volume data through pretreatment on data in current network.

The invention provides a synchronous digital hierarchy signal transmission method. In the method, a block frame consisting of 9 rows of bytes and 270 columns of bytes is adopted to bear E1 signals, wherein only 30 bytes in the block frame are occupied by fields used for channel management and multiplexing control, while the other 2,400 bytes are all used for bearing the E1 signals. The method hasthe advantages that: the block frame adopted in the method has a structure, similar to that of an STM-1 frame, consisting of 9 rows of bytes and the 270 columns of bytes; the transmission can be realized in transmission channels with an STM-1 rate by adopting a conventional SDH signal transmission mode; bandwidth utilization rate can maximally reach 98.77 percent; and the method is applied to microwave communication transmission.

The invention discloses a method and device for realizing an SDH optical interface of STM-1 by employing an oversampling method. The method comprises (1), a sending path that an STM-1 transceiver generates STM-1 data frames under clock frequency of 19.44 M, conversion of a clock domain from 19.44 M to 38.88 M is carried out on the data frames through a sending clock domain converter, under the clock frequency of 38.88 M, each piece of 1-bit data is copied into 4-bit data through a sending data bit width converter, the data is sent to an STM-4 optical interface module for sending; and a receiving path that STM-1 signals from an STM-4 optical interface are received, oversampling of four times per level is carried out on the signals under the clock frequency of 38.88 M, an STM-1 frame header is found, conversion from 4-bit to 1-bit is carried out on the data, the data is converted into signals under the 19.44 M through a receiving clock domain converter, and the signals are sent to the STM-1 transceiver for frame decoding.

The invention discloses a protection switching device for a synchronous transfer module (STM)-1 upper optical interface and an achieving method and relates to the field of STM-1 upper optical interfaces for a gigabit passive optical network (GPON) system. The protection switching device comprises a complex programmable logic device (CPLD), an optical interface chip supporting a two-way STM-1 optical interface, a primary STM-1 demultiplexing chip, a primary circuit simulation CES chip, a primary physical layer (PHY) chip, a standby STM-1 demultiplexing chip, a standby CES chip, a standby PHY chip, a switching control chip, an exchange chip and a backing plate. A primary optical path channel of the optical interface chip is connected with the switching control chip sequentially through the primary STM-1 demultiplexing chip, the primary CES chip and the primary PHY chip; and a standby optical path channel of the optical interface chip is connected with the switching control chip sequentially through the standby STM-1 demultiplexing chip, the standby CES chip and the standby PHY chip. According to the protection switching device, the time needed for performing protection switching on the STM-1 upper optical interface is short, and operators' requirements can be met.

Described is a method and apparatus for mapping Fast Ethernet data interfaces (in addition to possible data interfaces of different type) into a single VC-4 Virtual Container of a STM-1/OC-3 payload transmitted to a radio-link system. The method is characterized by the steps of: packeting the Fast Ethernet signal and any other signal, mapping the packets into a single (VC-4) Virtual Container of a STM-1/OC-3 payload of a SDH/SONET signal frame, and transmitting said signal frame through the point-to-point radio-link, said radio link being a point-to-point SDH/SONET radio link. All the packets have the same format and are associated to a header for identifying the source. The interfaces of different type are conveniently grouped. Possibly, the VC-4 is filled with null packets to exhaust the maximum available capacity.

An embodiment of the invention provides a method and a device for optical network data transmission. The method includes slicing a data frame of STM-1 (synchronous transport module level 1) type or STS-1 (synchronous transport signal level 1) to obtain a plurality of cells equal in length; and performing cross scheduling to the cells serving as cross grain size. The data frame of the STM-1 type or the STS-1 type is sliced to obtain the cells equal in length, and the cells serve as cross grain size to perform cross scheduling, so that a cross board can be shared to allow for unification of cross scheduling, complexity of cross scheduling is lowered and cost is reduced.

A method for protection of data traffic transmitted over 2-fiber shared protection ring on STM-1/OC-3 interface is provided. Also, the method involves carrying extra traffic in a ring topology for STM-1/OC-3 interface. This is achieved by fixing the granularity to one of ‘VC12/VC11/VC3/VC12-VC3/VC11-VC3’ for the STM-1 interface and to one of ‘VT2/VT1.5/STS-1’ for the OC-3 interface upfront when the protection is configured on the network element.

The invention discloses a test method and system of multiple paths of E1 ports for realizing an STM-1 interface. The method comprises the following steps of: building one-to-one correspondence relationship between each E1 port on the STM-1 interface at the middle equipment circuit side and N paths of E1 ports at the middle equipment branch circuit side; sequentially connecting N paths of E1 ports at the middle equipment branch circuit side in series, forming a serial connection test passage of N paths of E1 ports, connecting an SDH (Synchronous Digital Hierarchy) test instrument, and carrying out butt joint between the STM-1 interface at the middle equipment circuit side with the STM-1 interface of the tested equipment; and simultaneously testing all the E1 ports of the STM-1 interface of the tested equipment by the SDH test instrument through the serial connection test passage of the N paths of E1 ports, wherein N is an integer greater than or equal to 2. The middle equipment is used for completing the serial connection of multiple paths of E1 ports and the mapping of the E1 ports to the STM-1 interface, the monitoring of each path of E1 port of multiple paths of E1 ports on the STM-1 interface through network management is completed, and the simultaneous test of multiple paths of E1 ports on the STM-1 interface is realized.

The invention relates to a method for delaying the load data of light synchronous digit transmission network channel, wherein it comprises: a channel de-multiplex module; a channel storage module with synchronous FIFO module, write point control module and read point control module, while the channel storage module is used to store and read the channel load and load instruct of delay channel based on the delay distribution information; a channel multiplex module for multiplexing the non-delay part and the delay channel, based on SDH frame structure multiplex projection theory, to generate new STM-1, STM-4, STM-16, or STM-64 frame of delay channel. The invention supplies needed channel delay data for designing transmission device, to improve the design property of transmission device.

The invention relates to a 128*128 channel broadband data signal real time exchange system and exchange method. The 128*128 channel broadband data signal real time exchange system includes 8 photoelectric conversion circuits which respectively converting 8 channels of optical signals in the STM-1 frame format into electric signals correspondingly, 8 signal tapping-off modules which are used for tapping off the input electric signals after deserialization into GFP data frames, a baseband signal total exchange module which is used for extracting valid data from the input GFP data frames according to routing and exchanging the valid data to the output interface according to an exchange routing list to generate a new route and new data frames to complete data exchange, 8 signal multiplexing module which multiplexes the selected output GFP data frames into new electric signals in the STM-1 frame format, and an electric-optical conversion circuit which is used for converting the multiplexed electric signals in the STM-1 frame format into optical signals and outputting the optical signals. The 128*128 channel broadband data signal real time exchange system and exchange method can effectively solve the total exchange problem of the multi-channel of different rate baseband signals during the input and output process of the multi-channel of signals, and can improve the transmission rate of signals.

Multiplexing/de-multiplexing sections (14, 15, 19) are respectively provided on STM-4 substrates (B1, B2), STM-16 substrates (C1 to C3), STM-64 substrates (D1 to D3) to de-multiplex each of an STM-4 signal, STM-16 signal, STM-64 signal from a tributary transmission line (LL) into STM-1 signals. Then, transmission interfaces extending from the respective above substrates to time slot exchanging sections (2-0, 2-1) are all uniformed to STM-1 which is a basic transmission speed in SDH.