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Availability A Service Availability Check (SAC) will be conducted during the pre-sales process to determine if/when facilities arefwill be available within the target BMF. A SAC is required for all MetroE DIA orders. Metro Ethernet DIA Service can be ordered using either tiered/flat rate billing. Burstable billing is not available at this time. Asynchronous Transfer Mode (ATM) DIA Asynchronous Transfer Mode (ATM) access method for DIA is designed to meet the requirements for Internet connectivity for customers who have existing ATM networks. The Port+Access+CPE and Port+Access options are not available for ATM DIA; the customer must obtain their own ATM circuit separately, and BellSouth's DIA service will map an ATM Port Only across that circuit. ATM is only available with Burstable billing . These services require an existing ATM connection from the customer premise over the BellSouth ATM network to the BMF. Availability ATM DIA is available in many BMF's, but must be checked before service order. For ATM DIA services equal to or above 12Mbps, a Service Availability Check (SAC) will be conducted during the pre-sales process to determine if/when facilities are/will be available within the target BMF. DIA Service Access Suitability Examples Access Best Suited For Frame Relay Mission Critical file transfers • Connectivity for LANs, WANs, web servers, email servers • Companies looking for scalability Bursty Data applications Private Line File transfers where high security is needed Web servers connectivity with high multi-media content ATM Customers with existing ATM networks Metro Ethernet • Large file transfers • Non-mission critical applications Distance Learning 7) DIA Diversity Solutions To better serve some customers' needs, Dedicated Internet Access (DIA) customers may now purchase a Diversity Solution Product to enhance diversity (redundancy) at specific assignments and attributes for their Internet access. Diverse Solutions are designed for customers who have a need for continuous 1 fault tolerant Internet Access. While Diversity Solutions will increase the likelihood of non-interrupted Internet Access, this product cannot guarantee continuous and non-interrupted 100% Internet Access availability. Diversity Solutions are designed to provide customers with a Primary Access Solution to the Internet that will automatically fail-over to a Secondary Access Solution to the Internet should a trouble on the Primary Service interrupt the customer's connectivity. a) Diversity Options BellSouth Router Diversity Solution provides the customer two distinct DIA circuits achieving Internet connectivity, through access to (1 ) a router in a BMF (BellSouth Managed Facility) in case of the Primary Circuit, and (2) a different router in the same BMF in the case of the Secondary Circuit. Traffic will be routed / managed based on weighted static routes to the same BMF on the Diverse Routers. With this option, there will only be one router located at the customer premise, but the circuit will connect in thru diverse routers at the BMF. BellSouth Router Diversity Solution provides one router at the customer's location, if purchased in the Port+Access+CPE service type. The customer may provide a second router. Reuter ®rima, Router Customer ; 91,1F Reuter secondary Router Service Types The customer's primary circuit and secondary circuit have to be the same DIA Service Type. It means that both circuits will have to be Port+Access+CPE, Port+Access or Port Only Service Type. • Service Speeds The customer's primary circuit and secondary circuit do not have to be the same size; however, it is recommended that the secondary circuit be at least one half the size of the primary circuit. The customer should size the secondary (fail over) circuit so that the secondary circuit is able to send 1 receive all critical traffic in the event the primary service is down. The Secondary Circuit, in all cases, must be less than or equal to the Primary Circuit. • Service Transport CONFIDENTIALIPROPRIETARY — NOT FOR DISCLOSURE WITHOUT WRITTEN PERMISSION Version: 0812005 Page 10 of 19 Created On: June 28, 2006 CCP-12457