Our recent work on the regioselective synthesis of a number of heterocycles (4) prompted us to search for a simple and effi- cient reagent for this heterocyclization. We have recently achieved a facile entry to this ring system 6 (5) with the use of a well-known brominating agent, pyridine hydrobromide per- bromide, which we report here.
Voice VLAN. 1  Voice VLAN allows you to enhance VoIP service by configuring ports to carry IP voice traffic from IP phones on a specific VLAN. VoIP traffic has a preconfigured OUI prefix in the source MAC address. 2  You can configure VLANs on which voice IP traffic is forwarded.
VLAN known as a Virtual LAN is design to make sub LAN network without creating other physical network. The main roll of LAN network is connect multiple machine and merge as one network. LAN network design to communicate with other machine inside network. But in some case if your network is very larger or if your data is very confidential which will not suitable to share with all machine in network then VLAN allows to create virtual Local Area Network within same physical network.