36 results about "Gigabit ethernet passive optical network" patented technology

A GE-PON (Gigabit Ethernet-Passive Optical Network) system is provided that configures upstream and downstream frames on the basis of a variable-length Ethernet frame. The GE-PON system employs TDM (Time Division Multiplexing) for upstream packet transmission in a tree structure for a point-to-multipoint connection. A structure of a frame format is also provided that is capable of effectively accommodating Gigabit Ethernet traffic in the GE-PON system and a method is provided for implementing various functions such as initial ONU registration, late ONU registration, ranging, and dynamic bandwidth allocation in the GE-PON system.

A GE-PON (Gigabit Ethernet Passive Optical Network) system and media access control method for the same are disclosed. In the GE-PON system, by employing MAC attributes of the gigabit Ethernet frames, an OLT (Optical Line Termination) transmits a downstream window containing both a control frame having timeslot position and size information in association with at least two ONUs and Ethernet frames to an ODN (Optical Distribution Network). The OLT analyzes contents of RAUs in an upstream window transmitted from the ONUs in a TDMA method and received from the ODN, and permits timeslot position and size corresponding to each of the ONUs. A plurality of ONUs, connected to the ODN, have their respective timeslot position and size allocated in response to their respective information contained in the control frame of the downstream window. RAU frames are transmitted having queue information and Ethernet frames associated with the allocated timeslots. As a result, by the above MAC structure of the GE-PON system, the OLT can be quickly intercommunicated with a plurality of ONUs.

A method and apparatus for transmitting data from an optical network unit (ONU) to an optical line termination (OLT) in a Gigabit Ethernet passive optical network (GE-PON) on the basis of a time division multiple access (TDMA) scheme are provided. A measurement of a data transmission time when the data is transmitted to the OLT is obtained, and the measured data transmission time is compared with a predetermined normal transmission time. The transmission of the data is maintained if the measured data transmission time is determined to be less than or equal to the normal transmission time from the comparison result. However, if the measured data transmission time is determined to be greater than the normal transmission time, the transmission of the data is stopped.

One embodiment provides a pluggable optical line terminal (OLT). The OLT includes a bi-directional optical transceiver configured to transmit optical signals to and receive optical signals from a number of optical network units (ONUs), an OLT chip coupled to the optical transceiver and configured to communicate with the ONUs through the optical transceiver, and a pluggable interface coupled to the OLT chip and configured to electrically interface between the OLT chip and a piece of network equipment. The optical transceiver, the OLT chip, and the pluggable interface are contained in an enclosure complying with a form factor, thereby allowing the pluggable OLT to be directly plugged into the network equipment.

A Gigabit Ethernet passive optical network (GE-PON) having a double link structure is disclosed. The GE-PON includes an optical line terminal (OLT), a plurality of optical couplers, and a plurality of optical network units (ONUs). The OLT sets up an active link and a standby link in response to a registration request message received over an optical cable. Each of the ONUs is doubly connected with the OLT via the optical cable and is adapted to transmit the registration request message to the OLT, form the active link with the OLT via the optical cable if it receives an active registration message transmitted from the OLT in response to the registration request message, and form the standby link with the OLT via the optical cable if it receives a standby message from the OLT. The optical couplers are disposed between the OLT and each of the ONUs to doubly interconnect them via different optical cables.

The invention discloses a regenerating optical network of a gigabit Ethernet passive optical network and a gigabit Ethernet optical network system. The regenerating optical network comprises a wavelength division multiplexer, an optical-electrical conversion unit and an electrical-optical conversion unit. The wavelength division multiplexer is used for receiving optical signals, demultiplexing the optical signals and transmitting the signals to the optical-electrical conversion unit, the optical-electrical conversion unit is used for optical-electrical signal conversion of the received optical signals, processing electrical signals obtained during conversion, and transmitting the electrical signals to the electrical-optical conversion unit, and the electrical-optical conversion unit is used for regenerating optical signals through the received electrical signals, and the optical signals are multiplexed by the wavelength division multiplexer and transmitted to a receiving terminal. Although the regenerating optical network of the gigabit Ethernet passive optical network is not used as an active device, the transmission of large splitting ratio and ultra-long distance can be achieved through the gigabit Ethernet passive optical network; the cost is lower; and the implementation is more flexible, difficulties in operation are greatly reduced, and the product reliability is effectively improved.

Based on sectional type list of tail coordinates about quantity of subchannel bandwidth occupied as prepared distribution scheme, assigned quantities of subchannel bandwidth are realized. Using integral processing unit collects quantities of subchannel bandwidth. Sending out signal of requesting bandwidth according to size authorized by EPON system completes granting for quantity information so as to realize bandwidth distribution of up going flow on EPON system. Steps for bandwidth distribution are as following: interface of microprocessor sends out enable signal for reading / writing control; based on prepared distribution scheme, bandwidth designator converts and designates subchannel bandwidth to realize rearrangement of main / standby multiplexing; integral bucket corrects quantities of subchannel bandwidth occupied; based on request, authorization generating circuit sends signal of leaking command to control leaking operation of integral bucket so as to realize distribution.

The invention provides an ultrahigh-speed burst mode clock restoring circuit based on a gate-control oscillator, comprising the gate-control oscillator, four frequency dividers, a frequency-discrimination device, a charge pump, a low-pass filter, an interior clock buffer and a semi-velocity data restoring circuit. The ultrahigh-speed burst mode clock restoring circuit is characterized in that an output clock of the gate-control oscillator can restore a clock signal from input data of any phases within a plurality of bit times when data turn over under traction action of the input data, wherein the phase of the clock signal is aligned with the phase of the input data; the four frequency dividers, the frequency-discrimination device, the charge pump, the low-pass filter and the interior clock buffer are used for analyzing relation of output lock signal frequency and reference frequency and providing a control signal for the gate-control oscillator, and the semi-velocity data restoring circuit resets the data according to the restored clock signal to generate a restored data signal. The ultrahigh-speed burst mode clock restoring circuit disclosed by the invention is suitable for an optical fiber communication system, and in particular relates to a burst mode optical communication system taking a ten-gigabit Ethernet passive optical network technology as representation.