摘要:
Channel switching system and method of an IPTV service in a passive optical network (PON) are disclosed. To reduce a channel switching time of an IPTV system in the passive optical network, the system and the method use a channel switching control module and a channel list module in the passive optical network. In a case where a passive optical network system receives an IPTV channel switching request transmitted from a terminal user, the channel switching control module checks a recording of a channel list module and a recording of an authentication list module, and then updates a filter recording of an optical network unit to thereby directly transmit an image flow of a new channel in the passive optical network. When such system and method are applied to the passive optical network, high-speed switching of the IPTV service channel by the terminal user can be realized.
摘要:
Disclosed herein is an electronic apparatus produced using a high-temperature lead-free solder alloy which makes it possible to form soldered joints having no variations in strength and which has an excellent balance between strength and solderability. The lead-free solder alloy is an alloy which is made of an element A and an element B and which has a composition composed of AmBn being a stable phase and the element B in an equilibrium state at room temperature. When the lead-free solder alloy is solidified by quenching, the element A is dissolved in a room-temperature stable phase of the element B so that a supersaturated solid solution is formed, and when melted for soldering and then solidified, the alloy returns to its equilibrium state and has a composition composed of the stable phase AmBn and the element B and therefore maintains strength due to the presence of the stable phase AmBn even when reheated to a soldering temperature.
摘要:
An abnormality detecting apparatus includes an imaging device for obtaining image data of a TIM, a failure detecting section for detecting appearance failures of the TIM on the basis of the image data of the TIM obtained by the imaging device, and a determining device for determining whether an abnormality occurs at the TIM on the basis of a detection result by the failure detecting section.
摘要:
This invention provides a method of implementing a multi-party conference service (MPCS) using broadcast/multicast service of a wireless communications system used for a conference focus, the context of a corresponding broadcast/multicast service session is generated based on the media flow information, multicast service session information and MPCS information. The generated context of the broadcast/multicast service session is then sent respectively to at least one content provider server, at least one mobile terminal and the broadcast/multicast service controller so that the one or more mobile terminals acquires the content media flow through the broadcast/multicast service session.
摘要:
An optical line terminal connecting with numbers of optical network units comprises a control unit which controls each optical network unit to make it operate in a first mode in which transmission and reception of control messages and data are possible or in a second mode in which the transmission and reception of control messages are possible but the transmission of data is impossible, according to a communication permission request transmitted from an optical network unit and based on a preset maximum number of optical network units permitted to execute upstream communication from the optical network unit to the optical line terminal.
摘要:
A content relay node comprising a data processing unit for storing or transmitting a data packet on the basis of the data attribute, a storage connected to the data processing unit, transmitting units each for processing the header of a data packet in accordance with a control signal from the data processing unit and transferring the data packet to a neighboring relay node, and a routing control unit for selecting the transmitting unit or the data processing unit as a destination of a data packet on the basis of routing information including a storage address, wherein the storage unit stores a copy of a data packet at least until transfer of the data packet to the next node is completed.
摘要:
An optical access network and optical switching systems requiring no frame delay process on an optical switchboard are disclosed. Plural ONUs are connected to user terminals. An OLT communicates with an IP network through an access gateway. An optical switching unit (OSW) connects the ONUs and the OLT by switching the optical line. A control line connects the OLT and the OSW to control the optical switch change-over operation in the OSW. The optical switch port information required to generate the optical switch activation signal are concentrated in the OLT, which transmits the optical switch change-over control signal to the OSW through the control line before the transmission frame.
摘要:
It is necessary to completely remove overlapping of signals between plural PONs in order to make the PONs coexist. Accordingly, it is required to share or intensively manage bandwidth use conditions over an optical fiber that serves as a common band between plural systems. Therefore, transmission clocks should be synchronized with high accuracy between plural systems. A reference clock is provided from an external device or a representative OLT to the entire systems to perform clock synchronization between plural systems, so that the overall systems are synchronized by synchronizing each OLT with the reference clock. A hierarchical management method is selected that manages ONUs under the control of each OLT by managing band use information arranged for each OLT with respect to an external device or a representative OLT for sharing of bandwidth use conditions between plural systems.
摘要:
A passive optical network (PON) system includes at least one optical line terminal (OLT), a plurality of optical network units (ONUs) connected to each OLT, and an OLT management server used to manage the OLT. The OLT management server creates a VLAN access control table in response to a user's request to indicate a VID translation relation among different VLAN identifiers (VIDs) and sends a VID translation relation described in the VLAN access control table to the OLT, and the OLT creates a VLAN translation table indicating a correspondence relation between a source VID and a destination VID, which are waiting for translation, based on the received VID translation relation. If the OLT determines that a VID included in a received frame must be translated based on the VLAN translation table, the OLT references the VLAN translation table to translate the VID included in the received frame to a corresponding destination VID.
摘要:
A presence-base packet routing control apparatus having a presence policy management data base for indicating routing policies in association with user terminal's presence statuses analyzes presence information notified from a user terminal, translates the presence information into a presence status of the user terminal, searches the presence policy management data base for a routing policy corresponding to the presence status of the user terminal, and issues a command to install the routing policy in a particular router to which the user terminal is connected.