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Private Line DIA Private Line DIA service gives business customers a full-time dedicated connection from their customer premise to the Internet. The customer is connected to the nearest BellSouth Managed Facility ( BMF) directly with a private local loop circuit. Port+Access +CPE , Port+Access+CPE over SMARTRing@, Port+Access , Port+Access over SMARTRing@, and Port Only service options are available with Private Line DIA. Unlike Frame Relay, the Private Line access price is based on mileage from the customer's premise to the BMF . SMARTRing@ service Customers are able to provision Private Line DIA (either Port+Access +CPE or Port+Access Service options) over their existing SMARTRing@ service. The SMARTRing@ service requires a Shared Network Agreement (SNA) or similar arrangement designated by AT &T to allow the DIA service to be mapped across the ring . This DIA service does not include or provide the SMARTRing@ service itself. The use of SMARTRing@ interfaces replaces a portion of the local loop normally associated with the DIA Port+Access + CPE and Port+Access offerings Availability Private Line service is available in most BMF's . Private line can be ordered using either the flat rate or burstable billing method . For Private Line DIA services equal to and 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 . Metro Ethernet DIA (MetroE DIA) This service will enable customers to connect to the Internet at various Metro Ethernet speeds . MetroE DIA is available as Port+Access+ CPE , Port+Access and Port Only service options . When DIA is used with Metro Ethernet Premium service, packets originating from a particular Customer are identified by use of a Virtual Local Area Network number (VLAN Tag) that is assigned by AT&T when the service is provisioned . The VLAN tag is embedded in each ethernet packet received from the Customer and serves to identify the source of the packet to AT&T . The requirement to identify MetroE DIA Customers by VLAN Tag requires that the data transport service connecting to the BMF conform to the following requirements : 1 . The Metro Ethernet Service ordered from AT&T must be Metro Ethernet Premium service equipped with Q-Forwarding . Q-Forwarding is an optional Metro Ethernet Premium feature that adds support for VLAN tagging to the standard Metro Ethernet Premium service. 2 . If a Customer already uses an AT&T Metro Ethernet service that does not include VLAN tagging , (i .e. Basic Metro Ethernet service) , and one or more of the existing locations desire to add DIA services , then all locations served by that service must be upgraded to the Metro Ethernet Premium service. 3 . The CPE equipment effecting the ethernet connection at the Customer Premises to the Metro Ethernet service must support VLAN tagging via the 802 . 1Q protocol . (e.g . a Cisco 2821 router or equivalent). When a Port+Access of Port Only configuration is ordered , the Customer must provide compatible CPE and configure it according to the VLAN tags that will be assigned by AT&T during the ME DIA provisioning process . Customers providing their own AT&T Metro Ethernet transport to the Port Only Service option must purchase rate elements for Premium Fixed Metro Ethernet speeds 10M , 20M , 50M , 100M2 250M , or 500M , plus any additional mileage charges required to connect the customer premise to the closest equipped Metro Ethernet switch Central Office. Customer provided routers must be VLAN-tagging capable for Metro Ethernet DIA service . All dedicated , point-to-point transport services used to provide access to the DIA service are provided via the FCC jurisdiction tariffs or Guidebook. Availability 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 . 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 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 AT&T 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 • File transfers Connectivity for LANs, WANs, web servers, email servers Companies looking for scalability Bursty Data applications Private Line 9 File transfers where high security is needed • Web servers connectivity with high multi-media content ATM 0 Customers with existing ATM networks Metro Ethernet 9 Large file transfers • Distance Learning CON FIDENTIAL/PROPRIETARY — NOT FOR DISCLOSURE WITHOUT WRITTEN PERMISSION Version : 04/2007 Page 5 of 14 Created On : February 20, 2008 CCP-33130