(formerly Cingular Wireless) Responsible for engineering plan development, resource allocation, inventory management, vendor management, and trouble resolution for 2 of AT&T Wireless's 4 national data centers for the upgrade and expansion of the largest and most diverse data network in the world, supporting SMS, cellular internet, and iPhone networks. Responsible for troubleshooting install-related issues and for engaging and working with vendors such as Cisco, Juniper, Netscout, Lucent, etc. Worked extensively with switching (spanning tree, VLANs, VLAN pruning, VTP, Port Channels, trunk capacity management), routing (BGP, OSPF, VRFs), and firewall (PIX, ASA) on platforms including Cisco 65xx, 75xx, 76xx, ESR10xxx, GSR12xxx, as well as Juniper Mxxx, Txxx, Juniper Netscreen, and Lucent Brick 1000, 1100, and 1200 series firewalls. On Cisco chassis, worked with GigE, CSG1, CSG2, NAM, FWSM, and various supervisor modules. Did extensive troubleshooting and development of MPLS, BGP, OSPF, power management, rack space management, IP addressing, O/S revision management, TACACS, and circuit troubleshooting (GigE, 10GigE, FracT1, T1, FracDS3, DS3, SONET/POS OC3, OC12, OC48, OC192).