132 About the Nortel Ethernet Routing Switch 4500 SeriesIf you power down down the switch within 60 seconds you can lose thechanged configuration parameters.Policy-enabled networkingWith the Nortel Ethernet Routing Switch 4500 Series, you can implementclasses of services and assign priority levels to different types of traffic. Youcan also configure policies to monitor the characteristics of traffic.For example, in the Nortel Ethernet Routing Switch 4500 Series, you candetermine the sources, destinations, and protocols used by the traffic. Youcan also perform a controlling action on the traffic when certain user-definedcharacteristics match.The Nortel Ethernet Routing Switch 4500 Series supports DifferentiatedServices (DiffServ). DiffServ is a network architecture through which serviceproviders and enterprise network environments can offer various levels ofservices for different types of data traffic.You can use DiffServ Quality of Service (QoS) to designate a specific levelof performance on a packet-by-packet basis. If you have applications thatrequire high performance and reliable service, such as voice and videoover IP, you can use DiffServ to give preferential treatment to this data overother traffic.Power over EthernetThe Nortel Ethernet Routing Switch 4500 Series 4548-GT-PWR and the4550T-PWR (PoE switches) provide IEEE 802.3af-compliant power or PoEon all 10/100/1000 RJ-45 ports.PoE refers to the ability of the switch to power network devices over anEthernet cable. Some of these devices include IP Phones, Wireless LANAccess Points, security cameras, and access control points.The PoE switches automatically detect the network device requirementsand dynamically supply the required DC voltage at a set current to eachappliance.To configure and manage the PoE features, you must use either the CLI, theWeb-based management system, or the Java Device Manager.Note: You must use a four-pair Category 5 UTP cable for PoE. Astandard two-pair UTP Cable does not support PoE.Virtual Local Area NetworksVirtual Local Area Network (VLAN) provides a mechanism to fine-tunebroadcast domains.Nortel Ethernet Routing Switch 4500 SeriesOverview — System ConfigurationNN47205-500 02.01 Standard5.0 23 February 2007Copyright © 2007, Nortel Networks Nortel Networks Confidential.
