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.
I thought to configure in this way : set a Vlan id 20 named voice and a Vlan id 30 named data on all the switches. set all the data vlans as primary vlan. Set the IP for the vlans 1 (default) from 172.16.16.1 to 172.16.16.7 mask 24 bit. Set the IP for vlans 20 (where should pass voice data) from 10.10.10.1 to 10.10.10.7 mask 23 bit. set the IP for vlans 30 (the data ) from 192.168.0.1 to 192.168.0.7 mask 23 bit (this is the network actually used from clients on the lan ) All the port are untagged for Vlan 1 and tagged for vlan 20 and 30.