Abstract: A method for more efficiently operating a network, and more particularly, for discovery of a path maximum transmission unit (PMTU) between nodes on an IP network, is provided. The method includes (a) comparing the size of a received packet with a maximum transmission unit (MTU) of a next link; and (b) if the size of the received packet is greater than the MTU of the next link, generating an error message, transmitting the generated error message to a source node, generating a test message of the size of the MTU of the next link, and transmitting the generated test message to a destination node. According to the PMTU discovery method, a PMTU can be determined in a shorter time, and it is possible to minimize the use of network resources.

Abstract: A wireless transmitting and receiving apparatus for wirelessly transmitting a video signal to a remote display apparatus, a transceiver therefor, and a channel determining method for determining a channel to be used in transmitting and receiving a video signal between transmitting and receiving apparatuses are provided. The video signal transmitting apparatus comprises a super heterodyne-type transmitter which selects one of a plurality of channels, modulates a video signal to be transmitted, and provides the modulated signal to an antenna; and a frequency band and channel selector which controls a modulation and demodulation frequency of the transmitter. The apparatus enables wireless transmission and reception of a video signal between a video signal processing apparatus and a remote display apparatus.

Abstract: A method of upgrading software and a network device for performing the same are provided so that the operation of a network device is not catastrophically affected by a failure occurring while software is being upgraded in a network environment. The method includes upgrading software through the network and checking whether at least one failure occurs during the upgrade, operating the network device based on an old version of the software used before the upgrade is performed when it is determined that at least one failure has occurred, and operating the network device based on a new version of the software to which the old version is upgraded when it is determined that a failure has not occurred. Accordingly, even if the upgrade of the software is not performed normally, the network device can reattempt the upgrade of the software without being serviced or without using an external memory device.