45 results about "10G-EPON" patented technology

The invention discloses a method and device for rapid protection switching of passive optical network (PON) ports in any slot position in a 10 Gbit / s Ethernet PON (10G-EPON) system. The method comprises the following steps: a plurality of PON service protection switching groups formed by two identical PON service cards are arranged on an optical line terminal (OLT); any PON port on one PON service card and any PON port on the other PON service card in each PON service protection switching group are configured as main and standby PON ports respectively; and complex programmable logic devices (CPLDs) on the PON service cards respectively detect the working condition of each autonomous PON port in real time, close optical modules on the main PON ports and notify the other PON service card of enabling the optical modules on the corresponding standby PON ports via protection switching data frames when lost of synchronous (LOS) signals on one or more main PON ports are detected on one PON service card. In the invention, the CPLDs are adopted to detect and judge the switching conditions and control switching, thus avoiding the problem of long switching time caused by using software for treatment and effectively ensuring rapid recovery of services when a single disk or main optical fiber has a fault.

The invention relates to a method to discover Optical Network Units (ONU) with different speed capabilities in an Ethernet Passive Optical Network (EPON) by an Optical Line Termination (OLT), where logical links in the network are identified by Logical Link IDs, and the OLT can transmit and receive data with lGbit / s-speed (IG) and 10 Gbit / s-speed (10G), and the discovery process is handled in the OLT by a Multi Point Con not trol Process (MPCP), which exchanges messages as Data Units (MPCPDU) with the ONUs. This is achieved by extending the standard MPCPDUs in a way, that backward compatability is as- sured.

A method of signaling and detecting end-of-transmission on a data communications link that uses scrambling comprises, by a transmitting node of the network, appending an end of burst delimiter (EBD) binary sequence to burst data and transmitting the burst data and the EBD over the communication link to a headend of the network. In a 10 G EPON using a 64B / 66B transmission code, the EBD is exemplarily a 198 bit pattern.

The embodiment of the invention provides a 10G Ethernet passive optical network (EPON) uplink transmission method, 10G EPON uplink transmission equipment and a 10G EPON uplink transmission system. The method comprises the following steps of: receiving a first uplink optical signal and a second uplink optical signal transmitted by a wavelength division multiplexer (WDM), wherein the first uplink optical signal and the second uplink optical signal are provided by a first optical network unit for supporting a first uplink rate and a second optical network unit for supporting a second uplink rate respectively, and the first optical network unit and the second optical network unit correspond to different wavelengths respectively; performing wavelength detection on the second optical signal to judge whether the second optical network unit and the first optical network unit have wavelength conflict; and if the wavelength conflict is detected, inhibiting the second optical network unit to send uplink optical signals. According to the embodiment, uplink transmission is performed in the 10G EPON through the WDM so as to realize 10G high bandwidth transmission.

The invention discloses a timing device and method for automatically capturing a 10G EPON (10 Giga Ethernet Passive Optical Network) message and relates to the field of communication. The timing method comprises the following steps: after starting the automatic capturing, counting for a preset time by an absolute clock subjected to time correction of a user / OLT (Optical Line Terminal) / ONU (Optical Network Unit) under an absolute timing capturing mode; starting the 10G EPON message capturing and writing into a capturing cache according to screening conditions; under a relative timing capturing mode, detecting a frame content and a frame state captured by specific starting; starting to count by a timing clock till reaching the time preset by the user; and starting a packet grabbing process and writing into the capturing cache according to screening conditions. According to the timing method provided by the invention, the 10G EPON message can be automatically and accurately captured and analyzed; the space for storing the captured message is reduced by designing accurate timing and filtering conditions; the performance and the use efficiency of a remote dispatcher are promoted; and the intercommunication capacity of different equipment factories is enhanced.

The invention discloses a method for judging the optimum working voltage of an avalanche photodiode APD of 10G EPON, comprising the following steps: S1: Obtaining the reverse breakdown voltage V of the APD according to the test data of BOSA or the RSSI under the condition of no light br ;S2: Set an initial working bias voltage, select a fixed input optical power, test the current bit error rate or number of bit errors according to the preset duration, and then increase the working bias step by step with the set step value and repeat Test, test at least 3 points until the bit error rate or the number of bit errors increases; S3: Set the working bias as x and the bit error rate as y, and solve the quadratic equation y=ax 2 +bx+c, get a, b, c three coefficients; S4: According to the obtained a, b, c three coefficients, calculate the extreme value to get the corresponding APD DAC; S5: use the APD DAC value for sensitivity test, if qualified If passed, the APD DAC at the current temperature is subtracted from the corresponding temperature value in the APD DAC LUK table and updated to the APDDAC LUK after translation. If it fails, it fails.

Embodiments of the invention relate to a velocity detection method and a device, wherein the method comprises the following steps: filtering received signals to obtain a frequency component; comparing the frequency component with a threshold value, and outputting a velocity indicating signal according to the comparison result. The device comprises a filter processing module which is used for filtering the received signals to obtaining the frequency component; a comparison module which is used for comparing the frequency component with the threshold value; and a velocity judging logic module which is used for outputting the velocity indicating signal according to the comparison result. The embodiments perform filtering process to the received signals according to spectral distribution characteristics of the received signals so as to obtain the frequency component, and compare the frequency component with the threshold value so as to determine the velocity indicating signal. The velocity detection method and the device are suitable for the synchronous lead code re-defined by the 10G EPON standard.

The invention relates to a hardware coding method and circuit based on FEC (forward error correction) in a 10G EPON ONU (Ethernet passive optical network optical network unit). The hardware coding method comprises the following steps: S10. writing 66bit-wide data sent by a scrambler part into an fifo buffer; S20. writing the rest 65bit-wide data into nine register arrays in sequence after taking out the 66bit-wide data from the fifo buffer and removing the LSB (least significant bit) each time; S30. instantly starting a corresponding Reed-Solomon (RS) (252, 220) coder for coding once data are written into a certain register array, and then writing check bytes obtained through coding into corresponding bits of the corresponding register arrays to be registered; and S40. reading the data from the register arrays according to a certain format, thus obtaining the FEC coded data. The method and the circuit have the following advantages: the method is simple, convenient and effective and has high operability; and the circuit has a smaller scale and can achieve higher hardware circuit time sequence speed.

The invention discloses a 10G EPON OLT (Ethernet passive optical network optical line terminal) single-fiber three-dimensional optical module comprising a 10Gb / s laser driver, a 1.25Gb / s laser driver, a microcontroller, a single-fiber three-dimensional optical device and a received signal strength indication circuit under a burst mode, wherein the 10Gb / s laser driver and the 1.25Gb / s laser driver are respectively connected with an XFP (10 gigabit small form factor pluggable) connector and provide an automatic optical-power control (APC) loop and a backlight current sampling function; an analog quantity is converted into a digital quantity reported to the microcontroller; the microcontroller controls to continuously light; and optical power sent by different ONUs (optical network units) is monitored by receiving terminal sudden optical power monitoring, thereby realizing that a plurality of EPON ONU optical signals are subjected to time division multiplexing on the same optical fiber so as to realize single-fiber three-dimensional data transmission.

The invention discloses a 10G single-fiber bidirectional optical module, which comprises a burst laser driver, a burst light power indicator, a microcontroller, a single-fiber bidirectional optical device, an avalanche photoelectric diode bias control circuit, a limiting amplifier, a receiving end light power monitor and an SFP+ connector, wherein the microcontroller is mainly used for controlling the burst laser driver and the limiting amplifier; the single-fiber bidirectional optical device is connected between the burst laser driver and the limiting amplifier to realize conversion between electrical signals and light signals; and the avalanche photoelectric diode bias control circuit supplies a high bias voltage to a receiving end avalanche photoelectric diode and performs voltage compensation on the receiving end avalanche photoelectric diode according to the temperature property. The 10G single-fiber bidirectional optical module has the advantages of low design cost, simple circuit design and capability of meeting the requirement of a 10G EPON ONU symmetrical scheme.

The invention discloses a capturing circuit and a writing control method of 10G EPON (10 Giga Ethernet Passive Optical Network) messages. The writing control method comprises the following steps: receiving EPON messages interacting among 10G EPON OLT (Optical Line Terminal) and ONU (Optical Network Unit) through an optical module and a 10G SERDES (Serializer / Deserializer); combining and triggering message capturing according to set conditions after the decoding at a PCS (Physical Coding Sub-layer); writing the captured message into capturing cache, wherein the steps and formats for storing the capturing frames are as follows: writing 128bit frame data at an even number clock period while a frame envelope is valid; and writing the frame head byte number, the frame end byte number, the reaching time, the frame error indication, CRC (Cyclic Redundancy Check) verification error indication and frame boundary symbol of the frame within a clock period at the frame end. With the adoption of the capturing circuit and the writing control method, continuous EPON messages of 10 G can be captured and analyzed rapidly and precisely; the storage space of the captured message is reduced through specific triggering and screening conditions; the performance and the use efficiency of the remote scheduling are improved; and the inter-compatibility of factories of different equipment is enhanced.

The invention discloses a 10G EPON ONU BOB optical module-based receiving end hard pin connection circuit, which comprises a CPU module, a PMD module and a BOSA module, and is characterized in that the CPU module is connected with the PMD module through a differential line, and the PMD module is connected with the BOSA module through a differential line; the LED lamp further comprises a boosting module. The output end of the PMD module is connected with the input end of the boost module through a PWM wire and an FB wire of an APD. The output end of the boost module is connected with the receiving end of the BOSA module through a BIAS wire of an APD, and an RX + pin and an RX-pin of the BOSA module are connected with the input end of the PMD module through differential wires. According to the invention, the TO46 gold pin of the receiving end of the optical device does not pass through a flexible circuit board through various modes of optimizing PWM and FB wiring of the APD, shortening the length of a differential line and carrying out impedance control, independently supplying power to the receiving end circuit of the BOSA module and the like; and moreover, the sensitivity and the bit error rate level are not worse than those of a circuit connected by using a flexible circuit board, so that the production process difficulty and the material cost are reduced.