Abstract: A network switch can include a precision time protocol (PTP) module and a circuit board. The PTP module can provide a first clock signal and include a predetermined interface. The circuit board can include a socket, an oscillator and a selection unit. The socket can be inserted by the predetermined interface to receive the first clock signal. The oscillator can provide a second clock signal. The selection unit can include a first terminal, a second terminal, an output terminal and a selection terminal. The first terminal can receive the first clock signal when the predetermined interface is inserted into the socket. The second terminal can receive the second clock signal. The output terminal can output one of the first clock signal and the second clock signal. The selection terminal can receive a selection signal to control the output terminal to output the first clock signal or the second clock signal.

Abstract: A network system includes P upper switches, Q lower switches, and a first mapping device. Each upper switch of the P upper switches includes a plurality of upper ports. A group of upper switches selected from the P upper switches includes P1 upper switches. Each lower switch of the Q lower switches includes a plurality of upper ports. The first mapping device includes P1 upper adapter terminals coupled to a part of upper ports of the P1 upper switches, and P1 lower adapter terminals coupled to lower ports of a part of Q lower switches. The first mapping device is used for allocating a plurality of transmitting channels and receiving channels received by each upper adapter terminal to the P1 lower adapter terminals.

Abstract: A network switch can include a precision time protocol (PTP) module and a circuit board. The PTP module can provide a first clock signal and include a predetermined interface. The circuit board can include a socket, an oscillator and a selection unit. The socket can be inserted by the predetermined interface to receive the first clock signal. The oscillator can provide a second clock signal. The selection unit can include a first terminal, a second terminal, an output terminal and a selection terminal. The first terminal can receive the first clock signal when the predetermined interface is inserted into the socket. The second terminal can receive the second clock signal. The output terminal can output one of the first clock signal and the second clock signal. The selection terminal can receive a selection signal to control the output terminal to output the first clock signal or the second clock signal.

Abstract: A network switch includes a circuit board and a plurality of transmission ports. The circuit board is disposed in a chassis, and an opening of the chassis is corresponding to a first reference line. The plurality of transmission ports are disposed on an edge of the circuit board. The edge is corresponding to a second reference line, and the first reference line and the second reference line form an acute angle.

Abstract: A network system includes P upper switches, Q lower switches, and a first mapping device. Each upper switch of the P upper switches includes a plurality of upper ports. A group of upper switches selected from the P upper switches includes P1 upper switches. Each lower switch of the Q lower switches includes a plurality of upper ports. The first mapping device includes P1 upper adapter terminals coupled to a part of upper ports of the P1 upper switches, and P1 lower adapter terminals coupled to lower ports of a part of Q lower switches. The first mapping device is used for allocating a plurality of transmitting channels and receiving channels received by each upper adapter terminal to the P1 lower adapter terminals.

Abstract: A burn-in chamber is provided, configured to provide the required temperature for a device under test (DUT), including a side wall, a guiding plate, an air flow plate, a partition assembly, and a fan. The air flow plate has a ventilation structure, and the guiding plate is located between the side wall and the air flow plate. The partition assembly is disposed on both sides of the air flow plate. The partition assembly and the air flow plate together form an accommodating space for accommodating the DUT. The partition assembly forms a return channel with respect to the other side of the accommodating space with the side wall. When the fan is active, air from the accommodating space passes through the air flow plate and is guided to the return channel via the guiding plate, and air is returned to the accommodating space through the return channel.

Abstract: A cord retainer is configured to be detachably disposed on an electronic device. The cord retainer includes a hook portion, a connection portion, and a clamp portion. The hook portion is configured to be fastened to the handle of the electronic device. The hook portion may be a tubular structure that extends along an extension direction. The connection portion is connected to the hook portion. The clamp portion is connected to the connection portion, and is configured to retain a cord attached on the electronic device. The clamp portion may be a plate structure that extends along an extension plane that is parallel to the extension direction.

Abstract: A network interface card installed in a chassis switch, which includes a switch device and a controller, is provided. The switch device includes a plurality of ports coupled to other network interface cards in the chassis switch, and each of the other network interface cards is a fabric card or a line card. The controller is configured to perform different acts according to the card type of the network interface card, wherein the acts constitute a specific process of path planning which may prevent loops from occurring in the communication paths of control packet delivery between multiple network interface cards in the chassis switch.

Abstract: A chassis switch including a network interface card is provided. The network interface card includes a first Virtual Local Area Network (VLAN) ID to a first packet originating from an internal Internet Protocol (IP) address, to prevent the first packet from being forwarded to the outside of the chassis switch. In addition, the network interface card further includes a second VLAN ID to a second packet originating from an external IP address, to allow the second packet to be forwarded to the outside of the chassis switch.

Abstract: An A-MSDU sub-frame processing method is provided. The method includes: allocating a first sub-block and a second sub-block adjacent to the first sub-block in a memory when an Ethernet frame is received, wherein the first sub-block includes a block with a preset bit length, the second sub-block includes a block with a bit length corresponding to the Ethernet frame, and a pointer initially points to a first initial address in the second sub-block; sequentially storing header information of the Ethernet frame into the second sub-block according to a header format of the Ethernet frame; filling the first sub-block with length information of the Ethernet frame; shifting the pointer along a first direction to a second initial address whose distance shifted from the first initial address is the preset bit length; and reading out data in a length along a second direction from the second initial address to generate the A-MSDU sub-frame.

Abstract: A printed circuit board (PCB) for high-speed transmission is provided. The PCB includes: a plurality of circuit layers having one or more differential signal wires; a ground via, an anti-pad, and a signal via pair. The one or more differential signal wires have a first differential signal wire width on the plurality of circuit layers. The ground via provides a ground terminal to the plurality of circuit layers. The signal via pair is for connecting the plurality of circuit layers via a through-hole, so that the one or more differential signal wires pass through the anti-pad and pin through the plurality of circuit layers for signal transmission via the signal via pair. The one or more differential signal wires have a second differential signal wire width on the anti-pad, wherein the second differential signal wire width is greater than the first differential signal wire width.

Abstract: The parabolic antenna includes a first radiating element, a second radiating element and a parabolic dish. The operating frequency of the first radiating element is different from the operating frequency of the second radiating element. The first radiating element and the second radiating element are disposed in front of the parabolic dish. Under different circumstance, the first radiating element and the second radiating element may operate simultaneously or non-simultaneously.

Abstract: An embodiment of a method for adaptive multi-antenna selection, executed by an AP (access point), which contains at least the following steps. After a data transmission request or a data receipt request is received from a client station, it is determined whether the client station is the first time connected client station within a predetermined time interval. If the client station is the first time connected client station, a first antenna combination is selected to transmit/receive data with the client station using a first antenna selection procedure. If the client station is not the first time connected client station, a second antenna combination is selected to transmit/receive data with the client station using a second antenna selection procedure.

Abstract: A communication apparatus includes a first communication module, a second communication module, an antenna module and a filtering module. The first communication module transmits and receives a first RF signal on a first channel. The second communication module transmits and receives a second RF signal on a second channel. The antenna module includes multiple antennas for transmitting and receiving the first and second RF signals. The filtering module is coupled between the first and second communication modules and the antenna module. The filtering module filters the first RF signal according to a first frequency response, and it filters the second RF signal according to a second frequency response to ensure the first RF signal and the second RF signal do not interfere with each other.

Abstract: A method for loopback detection includes: receiving a loopback detection frame by a port; detecting and determining whether the loopback detection frame is transmitted via the port; analyzing the loopback detection frame and determining whether a loopback has occurred in a network device when the loopback detection frame is transmitted via the port; when the loopback has occurred, determining the loopback has occurred in which of one or more virtual local area networks (VLANs) that the port joins in; blocking the VLAN(s) that the port transmitting the loopback detection frame joins in and in which the loopback occurred, for the port being unable to transmit any packet in the blocked VLAN(s); and when the loopback has not occurred, dropping the loopback detection frame.

Abstract: A wireless network device includes an antenna array and a lobe interleaver. The antenna array includes a plurality of antenna elements with different squint angles. The lobe interleaver is coupled to the antenna elements and has a plurality of output lobe ports. The lobe interleaver divides and interleaves the radio signal of the antenna array with the same phase and the same power to generate a plurality of lobes with different squint angles. The number of lobes is twice the number of antenna elements.

Abstract: A method for determining a maximum segment size is disclosed. The method is used in an access point. The method includes: detecting a first MSS value between the access point and at least one device; setting a TCP MSS value of at least one TCP session established by the access point as a second MSS value; comparing the first MSS value with the second MSS value, and choosing a minimum value among the first MSS value and the second MSS value as a maximum value; and recording all the MSS values between the access point and the subsequent devices and the maximum value into a device MSS table.

Abstract: A network device and network device recognition method are provided. The method includes: receiving a Continuity Check Message (CCM) by a local Maintenance Association End Point (MEP); determining whether the CCM is transmitted from an unknown remote MEP; setting the unknown remote MEP to a dynamic MEP if the CCM is transmitted from the unknown remote MEP; and recording the dynamic MEP and the receiving count of the CCM corresponding to the dynamic MEP in a storage unit.

Abstract: A method and system for auto provisioning a data center network having a plurality of switches interconnected in a folded Clos topology includes each switch advertising information about itself to neighboring switches and locally storing received information. The configuration server queries information stored by one switch and uses a predefined protocol and the information stored by the one switch to query each switch neighboring the one switch about the information stored locally by the each switch neighboring the one switch to generate a database having topology information of the data center network. Configuration settings for each switch in the data center network are generated, with each generated configuration setting corresponding to one switch. The configuration server uses the predefined protocol and the database having topology information of the data center network to send the configuration settings to the corresponding one switch for each switch in the data center network.

Abstract: A method for controlling packet priority is disclosed. The method is used in an access point and includes: associating with a station (STA) by a virtual access point (VAP) of an access point (AP), wherein an packet priority queue is applied in the STA initially; transmitting a configuration beacon frame to the STA by the VAP; reconfiguring the packet priority queue of the STA according to the configuration beacon frame; and transmitting an uplink data packet by the STA following the packet priority queue of the STA after receiving the configuration beacon frame from the VAP.