Abstract: Provided are a media stream delivery method, a content delivery network (CDN) node server, a CDN system and a readable storage medium. The media stream delivery method includes: receiving a data packet of a media stream; writing the received data packet of the media stream into a shared memory; and responding to a request of a user terminal, reading the data packet of the media stream requested by the user terminal from the shared memory, and sending the data packet.

Abstract: An apparatus for preparing graphene by means of laser irradiation in liquid, comprising a laser generating system, and further comprising a computer control system, a cleaning and drying system, and a workpiece auxiliary system. The light spot diameter of the laser emitted from a pulse laser unit (26) is increased by means of a beam expander (24), and the laser is reflected and split by a beam splitter to form two laser beams; a first laser beam (19) shocks the right vertical plane of a graphite solid target (18) by means of a focusing lens, and a second laser beam (17) shocks the left vertical plane of the graphite solid target (18) by means of the focusing lens, so as to grow graphene on a copper foil (5) substrate.

Abstract: An apparatus for preparing graphene by means of laser irradiation in liquid, comprising a laser generating system, and further comprising a computer control system, a cleaning and drying system, and a workpiece auxiliary system. The light spot diameter of the laser emitted from a pulse laser unit (26) is increased by means of a beam expander (24), and the laser is reflected and split by a beam splitter to form two laser beams; a first laser beam (19) shocks the right vertical plane of a graphite solid target (18) by means of a focusing lens, and a second laser beam (17) shocks the left vertical plane of the graphite solid target (18) by means of the focusing lens, so as to grow graphene on a copper foil (5) substrate.

Abstract: An optical network unit (ONU), a communication system and a communication method are disclosed. The ONU includes a passive optical network media access control (PON MAC) module and a processing module, the processing module includes a physical bridge submodule and at least two ONU submodules connected with the physical bridge submodule, different ONU submodules correspond to different identification information; the PON MAC module is configured to: be connected with the processing module, determine corresponding ONU submodules according to identification information in network side data, and send the network side data to the physical bridge submodule; the physical bridge submodule is configured to: distribute the network side data to corresponding ONU submodules according to the ONU submodules determined by the PON MAC module; and the ONU submodule is configured to: process the received data, and send the data to the user interface module corresponding to the ONU submodule.

Abstract: Disclosed are an ONU, a communication system and a communication method for an ONU. The ONU provided in the present disclosure includes a processing module and at least two user interface modules. At least two ONU sub-modules are disposed in the processing module. The disposed ONU sub-modules are corresponding to the user interface modules in a one-to-one manner. Each ONU sub-module processes the user side data from a corresponding user interface module.

Abstract: Disclosed are an ONU, a communication system and a communication method for an ONU. The ONU provided in the present disclosure includes a processing module and at least two user interface modules. At least two ONU sub-modules are disposed in the processing module. The disposed ONU sub-modules are corresponding to the user interface modules in a one-to-one manner. Each ONU sub-module processes the user side data from a corresponding user interface module.

Abstract: An optical network unit (ONU), a communication system and a communication method are disclosed. The ONU includes a passive optical network media access control (PON MAC) module and a processing module, the processing module includes a physical bridge submodule and at least two ONU submodules connected with the physical bridge submodule, different ONU submodules correspond to different identification information; the PON MAC module is configured to: be connected with the processing module, determine corresponding ONU submodules according to identification information in network side data, and send the network side data to the physical bridge submodule; the physical bridge submodule is configured to: distribute the network side data to corresponding ONU submodules according to the ONU submodules determined by the PON MAC module; and the ONU submodule is configured to: process the received data, and send the data to the user interface module corresponding to the ONU submodule.

Abstract: A main and standby switchover method, apparatus, device, and system for a network device relate to the technical field of wireless networks. The method includes: receiving an interrupt signal indicating that a switchover needs to be performed for main and standby GE ports; performing a switching operation of the main and standby GE ports, setting the main GE port in a blocked state, and in the blocked state, the main GE port only forwarding a bridge protocol data unit (BPDU) message, and stopping learning a MAC address; and enabling the standby GE port, setting the standby GE port in a forwarding state, and in the forwarding state, the standby GE port forwarding messages of all types, and learning the MAC address.