SUMMARY:

• 10+ years of professional experience in Networks with Voice, Data & LAN/WAN and Packet Core ( Cisco / ALU / Ericsson / NSN ) as a designer/tester/technical support role.
• Technically sophisticated and seasoned Network/Test Engineer with Master’s degree in Electrical Engineering.
• PhD Dissertation in Cloud Computing ( In Progress )
• Excellent knowledge of GSM, 3G, UMTS, CDMA, 4G and LTE Architecture Packet Core and Evolved Packet Core (EPC) and nodes including MME, SGW, PGW, HSS, PCRF, SGSN, GGSN.
• Managing and troubleshooting of AT&T network comprising of Ericsson, Alcatel Lucent and Cisco equipment.
• Experienced in writing scripts for test cases / management.
• Maintenance of existing network for day to day activities like link utilization and traffic monitoring
• Experience in managing complex routed networks providing technical support, troubleshooting and configuration.
• Experience in Cisco Routing, Switching and Security with Strong hands on Cisco Routers and Switches.
• Network and Systems Virtualization enthusiast
• Intuitive analytical ability for design, development, implementation, documentation to attain network, system and application level solutions.
• Team player with interpersonal skills; Managed teams of 6+ individuals.
• Experience in designing and managing datacenters.
• Provide technical input and co - authorship of key documentation: NDR, JRD, HLA, DA, TOL, MOP etc

NETWORKING AND TELECOMMUNICATION SKILLS:

Datacenter Technologies:  Cisco Nexus 2K FEX, Nexus 5K, Nexus 7K,, Cisco UCS, Nexus 1000v, Cisco MDS 9500 series, VPC, fabric path, OTV, Storage, virtualization, VMware ESXi, vCenter, NX-OS L2,L3,Security Feathers, VSANs., Vanila and Mirantis OpenStack Deployment.

Cloud Computing Technologies:  Hands on OpenStack and OpenContrail, In depth knowledge on IAAS, PAAS, SAAS, SLA on cloud,r

Network Routers: Cisco 1700, 1800, 2600, 2800, 3600, 3700, 3800, 7200, 7600, ASR 5000, ASR 9K, 12000, CRS-1 series configuration and troubleshooting.

Network Switches: Cisco Catalyst 1900, 2100, 2600, 2800,3 650 375 0, 4500, 5000, 6500 series switches configuration & troubleshooting.

Network Firewalls: Cisco ASA 5520, 5540, 5560, and Cisco Firewall Services Modules, PIX (535,525), ACS, IOS firewall feature set configuration, support, and management.

Cisco IOS:  Issues and configuration of Cisco IOS, Standard and Extended Access Control-Lists

Routing Protocols: Working Knowledge of BGP, OSPF, EIGRP, IS-IS, MPLS, IGRP, RIP, RIP v2, G.703, SIP, H.323, PIM, SONET, Static routing, and policy routing design, configuration, and support. Good understanding of OSI, TCP/IP, Subnetting, VLSM.

Security Protocols: AAA, IPSec, IKE, ESP, PKI, Radius, TACACS, 802.1x, PKI, SSL encryption, TLS

LANs and WANs: ATM, LDP, Frame Relay, PPP, ISDN, Ethernet (Gigabit Ethernet, Fast Ethernet) FDDI, VLANs, Private VLANs, VPN, STP, VTP, RSTP configuration and support, IP Addressing, reverse & proxy ARP, DSL/Cable, hubs, routers, cabling.

Network Services: DNS, DHCP, NTP, SMTP, RMON, FTP, TFTP, HSRP/VRRP, GLBP, WCCP, IP SLA, Performance Routing (OER/PfR) NAT,PAT, ARP, ICMP, IPv4 to IPv6 migration.

SDN: Knowledge of Contrail, OpenStack, Cisco ACI

Testing:  knowledge of Layer 2/3 testing, Knowledge of L3 Test Sets from Agilent/IXIA and Spirent (STC), black box /white box testing

Network Management: Cisco Works, Solar Winds, MRTG, ASDM, SDM, Wire Shark, SnifferPro, Ethereal, SNMP, Whatsup Gold,

Network Security Sensors: Cisco IPS, IDS, IDSM signature configuration, support, and management.

Shell Languages: Tcl/Tk, Unix Scripting, tool development

Network Documentation: MS Visio, MS Word, MS PowerPoint

Networking Simulators:  knowledge of OPNET, good knowledge of NS-2

Storage area networks:  Understanding of SAN switches, Fiber Channel and Gigabyte Ethernet Protocols 

VoIP:  Knowledge of VoIP technologies such as VoIP Switch, Asterisk

Juniper routers : Knowledge of Juniper routers M-320,T-640 and MX-960

Experience in configuring IP Multicast, redistribution between routing protocols troubleshooting them

HP Hardware:  DL380, DL360, HP C7000

Wireless technologies and nodes : Excellent knowledge of 3G and LTE Architecture and nodes including MME, HSS,PCRF, PDSN, Femto Cell, MSC, SGW, PGW, GGSN, SGSN in the PS/CS core network.

Handovers in LTE:  Handovers based on based on X2, S1, Inter RAT handover, Familiarity with 3GPP TS Rel 8, MME functions, LTE call flow, Protocols on all interfaces, 4G to 3G handoff, Pooling Scenarios, S-GW, P-GW Selection, All SGSN interfaces and protocols.

LTE network Interfaces:  S1-mme, S1u, S3, S4, S5,S6a, S8, S10 and S11 and command over GTPv2 and S1AP, Diameter, NAS

Wireless Interfaces: A, Iub, lur, Gn, Gp, Gi, Gr, Gx, IuPS, IuCS, Understanding of UTRAN, including air interface.

Knowledge of RF design parameters: (e.g., link budget), radio protocols (e.g., MIMO, handoff), coverage and capacity planning techniques, radio propagation modeling and prediction, traffic modeling, RF hardware.

IMS:  IR-94, Good understating of IMS/VoLTE architecture including the network elements - AS, I/S/P CSCF, SIP Signaling/call flows/important messages & RTP, RTCP, SDP and related 3GPP IMS protocols. Signaling and transport protocols SS7, SIGTRAN, Traffic forecasting and Analysis.

COMPUTER SKILLS / PROGRAMMING/SCRIPTING:

Programming:  C language programming, Visual Basic, Python scripting

Software:  VMware workstation, Active Directory; Visio

Operating Systems:  Windows XP / 7 / 8/10, Windows 2003/2010/2016 Server, UNIX, Linux (Redhat, Ubuntu), MacOS X (Desktop)

PROFESSIONAL EXPERIENCE:

 Solution Architect / Senior Packet Core Engineer

Confidential

• Working on NEO 9.0 ( LEP/ TAM/ Implementation Guide etc )
• First NET ( NDR/ LEP/ TAM/ Implementation Guide/ Testing and FFA Plan )
• MOCN, SPID call flow Testing Plan.
• EMBMS Solution development and deployment with Ericsson for AT&T
• Storage Area Network deployment for the Virtualization project.
• Security Entitlement Server(SES) for WiFi calling
• Responsible for Node specific engineering, implementation & test planning involving Juniper, Cisco, Ericsson, HP and Hitachi hardware.
• Provide technical guidance & oversight of inter-vendor certifications
• Design, develop and validate solutions based on 3GPP specifications
• Develop and execute detailed plan and procedures for lab and field execution
• Provide guidance and support during field execution of lab certified procedures
• Support Field team for common technical requirements and design for dependent features & functionality
• Provide technical leadership specific to Packet Core Nodes around the lab work (LEP, BoM, TOL, etc.)
• Formalize detailed technical requirements and design criteria in support of LTE/ EPC architecture
• Represent packet core team in cross functional meetings with internal AT&T organizations and vendor community as needed
• Design, Testing, Validation and Implementation of WiFi Calling. OEM Device Certification for Samsung devices. Nodes included (MSP, AAA, Secured Entitlement Server)
• Lead a team of testers and engineers for the testing effort

Packet Core Validation Engineer

Confidential

Redmond, Washington

Responsibilities:

• Strong support for a Network Function Virtualization ( NFV ) MME & MME/SGSN combo product in the AT&T lab
• Commissioning, integration, system verification, acceptance and troubleshooting of of the MME/SGSN functionality
• End-to-end IP connectivity validation between SGSN-MME and end IP nodes like RNC, GGSN, eNodeB, S-GW, DNS, OSS, etc
• Design, develop and validate solutions based on 3GPP specifications
• Formalize detailed design criteria & define topology for MME deployment (pooling, etc.) & integration with 2G-3G
• Formalize detailed technical requirements and design criteria in support of LTE/ EPC architecture
• Execute the Test Object List ( TOL ) and resolve issues with the R&D team in Richardson, Texas
• Provide technical guidance & oversight of inter-vendor certifications.
• Carrying out VoLTE testing and trouble shoot issues.
• Understanding of IMS architecture and protocols like RPT/RCTP/SIP/UDP
• Worked on Juniper MX-960 and Contrail/OpenStack based NFV solution.

LTE SGSN/MME Design Engineer

Confidential, Redmond, Washington

• Analyzing System Requirements, capacity, cost and customer needs to determine feasibility of project and develop system plan
• Support role for SGSN - MME IPv4 and IPv6 packet core validation, Special focus on S1-mme and S11 interface, including platform certification and integration, Feature Testing and Troubleshooting.
• Support Development of Quality Center test suite for the IPv6 Projects based on the AT&T labs architecture mode.
• Develop and perform operational, maintenance and testing procedure for electronic products, components equipment and systems;
• Engineering, configuration/feature and regression testing
• End-to-End IP connectivity validation between SGSN-MME and end IP nodes like RNC, GGSN, eNodeB, SGW, DNS, OSS, etc;
• Designing and building of a lab;
• Oversaw IOT; Managed validation timeliness
• Prepared Test plans based on Functional Specifications.
• Support in FFA and participated actively in FFA TOL preparation.

Tools/Equipment worked upon

• Created and executed Test cases on ALU MME 9471 ( LM 4.05 / LM5.01), Ericsson MME MKVI+, E// 2G Gn and 3G S4 SGSN, NSN 2G and 3G S4 SGSN for IPv6 Baseline, Compliance, Performance, Resiliency and Regression, IRATs, Handovers, QoS, Legal Interception, Load Testing, VoLTE, Quality of Service (QoS), Legal Interception.
• Monitored traffic captured and analyzed traces on JDSU Signaling Analyzer and Tecktronics probe.
• Tested MME S1 and S11 interfaces using Packet Storm IP network Emulator
• HP Quality Center 10.00 and Load Testing using Spirent landslide.
• LG LTE Diagnostic monitor (L2DM) with LG device, Sierra Wireless, Samsung Devices, ALU SAM, MME GUI, MME Provisioning Interface
• Hands on HSS and HLR provisioning for APN related changes.

Telecom Network Engineer

Confidential, Philadelphia, Pennsylvania

• Experienced in capturing traces and analyzing protocols on different platforms such as IXIA, Wireshark and Agilent/JDSU.
• Configured, Managed and Troubleshooted ASR5000 as an MME.
• Worked on RAN IP Backhaul Planning and Optimization using Cisco MWR 2941 and Mobile Offload Gateway solution to divert Internet bound traffic to Wi-Fi and Femtocell networks.
• Create test cases for mobility nodes and perform black box testing as per requirement.
• Responsible for setting up L3 IPv4/IPv6 setups for test planning and test plan execution and complex data network trouble resolution.
• Involved in UMTS 3G backhaul Circuit provisioning and commissioning (service delivery) function
• Provisioning OSPF and VLANs over the secured connection on CISCO and ALU service routers.
• Worked on Telecordia Granite Inventory, Layer 3 Testing with Spirent QScope.
• Working knowledge of Cisco MWTM (Cisco Works), Alcatel Lucent - Service Aware Manager
• Provisioning of SIAD and MSN and configuration of VLANs to support the multi chassis deployment
• Working knowledge of ACAT, Netcool and CTS.
• worked on the CISCO 2941 MWR wireless router, 7609 Service Provider Router, Cieana 3911, ALU 7705 SAR and ALU 7750 Service Routernt
• Used xcal, mapinfo 10.5, Microsoft Streets & Trips v 2010, 2011, cluster based drive testing.
• Learned systematic knowledge of 4G networks to improve the drive testing results.

 Research Assistant

Confidential

• Research on UMTS/LTE Core Network planning and optimization. Core Network traffic measurements, KPI analysis.
• Study of O&M of GSM/UMTS R99 and R4 Core Network Nodes
• Worked on Cisco 3 600 and 25 00 series routers and Catalyst 5000, 2 900 and 1900 series switches.
• Testing connectivity between different networks and solved the problems using 7 steps of CISCO network troubleshooting.
• Support and maintain networking devices (Hubs, Switches) cabling and standalone systems.
• Worked on Layer 2 switching: configuring VLANs, STP and VTP and etherchannels.
• Layer 3 routing protocol configurations: Static Routing, RIP, RIP2, IGRP, EIGRP, OSPF
• Research work also included working GNU Radio, NS2, Wire shark, basic Unix commands, Shell Scripting, Ubuntu, Linux, and Universal Software Radio Peripheral (USRP).
• Studied various cognitive radio technologies and wireless protocols.

Lab/Test Engineer

Confidential

• Worked with OPNET simulator.
• Managed LAN/WAN infrastructure as a part of the Network team. The LAN consisted of Cisco campus model of Cisco 3550 at access layer, Cisco 6513 at distribution/core layer.
• Used network management tools Wireshark, Packet sniffer for monitoring LAN and WAN
• Worked and troubleshoot T1, T3, E1, E3, DS3 Frame Relay circuits for testing & installation in routers and connectivity issues.
• Worked on UMTS tuning and optimization Project.

Network Engineer

Confidential

• Provided 24/7 network support for various companies.
• Worked with Senior Network Engineer to provide basic secure connectivity using complex LAN, WAN networks with several VLANS using Serial Link, frame relay circuits, Site to Site VPN, ISDN, EIGRP, OSPF, MPLS on the Cisco 7206s routers, Catalyst switches.
• Regular Trouble shooting using various command tools on CISCO routers and network segments at various OSI layers.
• Assisted in planning and designing of VOIP networks.

Network Engineer

Confidential

• Designing, implementing and supporting LAN/WAN using Cisco routers and Catalyst switches.
• Responsible for installation, configuration and support of Dial-up/ Leased line and ISDN Modems.
• Created end-user VPN accounts. Installed and configured for VPN IPsec and VPN Dial-up connections for remote users.
• Configured and Worked on access-lists and PIX firewall, NAT and PAT, HSRP, Trunk and spanning-tree ( MST/PVST)
• Involved in troubleshooting of day-to-day network issues like VPN tunnels ; ARP issues; VLAN issues
• Prepared SPGW Test plans based on Functional Specifications.
• Used tools Wire Shark, Packet Sniffer and Microsoft Network Analyzer for monitoring LAN and WAN for Networking failure issues
• Devices/Softwares/Applications used: MME, SGSN, MME GUI, CISCO Routers and Switches, NAT, PAT, HSRP, and ALU SAM 5620, Some of the device platforms worked on include Cisco 7603/7609/7613 and 6500 .

Systems /Test Engineer

Confidential

• Designed, implemented and maintained a multi-tier, fully redundant production network architecture
• Extensive formal planning and documentation for all activities
• Worked with NOC team to address performance bottlenecks and insuring maximum network performance and efficiency
• Performed IOS up gradation and network management via telnet session.
• Performed troubleshooting and configuration of routers and switches by looking at router logs, interface statistics and routing tables.
• Continuous Monitoring CISCO switches 3750 and CISCO router 2800 and management of VLAN across the network.