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.
IEEE 802.1Q, or VLAN Tagging, is an IEEE standard allowing multiple bridged networks to transparently share the same physical network link without leakage. IEEE 802.1Q (and its shortened form, dot1q) is used to refer to the encapsulation protocol used to implement this mechanism over Ethernet networks.