SUMMARY

Experienced network and software engineer with over 20 years’ experience in the telecom industry. Strong engineering professional skilled in Internet Protocol Suite (TCP/IP), Switches, Routers, Session border controllers (SBCs), Firewalls, and Voice over IP (VoIP) application servers. Focused and detail-oriented engineer offer exceptional troubleshooting skills and a talent for developing innovative solutions to unusual and difficult problems.

SKILLS

Cisco routers and switches

Network protocols

Protocol analyzers

Network traces

OSI network layers Analysis and problem solving

Network installation and configuration

C/C++

Python, Perl

Java

Unix/Linux

VxWorks

VMware, Apache, Citrix

PROFESSIONAL EXPERIENCE

Charter Communications / Time Warner Cable Inc. Herndon VA 10/2006 - Present

Senior Network Engineer, VoIP Operations

Troubleshoot, maintain, configure, install, upgrade, patch for the following VoIP equipment’s in seven TWC regional data centers:

Layer 2 and 3 Network Equipment: Cisco ASR9K, 6509, 4900M, 3750, 3650, 2960, Juniper T320, EX4200 and HP10508, FlexFabic 5700

Firewall: Juniper Netscreen 5200, SRX 5400, Cisco PIX

Session Border Controller: Oracle (Acme Packet) SBC

Telephony Application Servers: ALU 5420 CTS, 5420 PCM, 5900 MRF, and 1360 COM

Telephony Softswitch: Cisco BTS, Nokia Hiq

IP Multimedia Subsystems (IMS): Nokia IMS

Provide top operational tier support for more than seven million VoIP customers.

Collaborate with VoIP engineers, quality assurance engineers, system engineers and vendors for issues found in VoIP operation for a timely resolution and verify fixes delivered by vendors.

Develop tools and scripts to automate certain routine operation and testing activities.

Execute proactive monitoring measures to reduce equipment outages.

Develop test plan, execute testing and analyze test result before all deployment in the production.

Participate in development of technical requirements and specifications for complex VoIP network elements and systems.

Cisco Systems Inc. Herndon VA 4/2005 - 9/2006

Software Quality Assurance Engineer, Routing and Service Provider Technology Group

Design and build a VoIP enterprise system test bed for British Telecom according to customer requirements. In this test environment, use IP as core network, interconnect business voice services (Cisco Call Manager) and DPNSS PBX, Q.SIG PBX. Route VoIP calls internationally or through gateways to PSTN and wireless network.

Install, configure and work on Cisco switches, routers, media gateways, IPSec VPN and PIX firewalls.

Plan, design and implement multiple clusters Cisco Call Manager system into BT enterprise system with enhanced features such as unity voice mail, Cisco IP Manager Assistant, Meet-me conference and video call.

Identify, troubleshoot, diagnose and report problems in Cisco Call Manager system. Collaborated with cross-function development team to solve those problems including provisioning, call processing, billing and network management.

Write detail test plan and test matrix for new network enhancements and execute tests according to the related test plan and test matrix. Generate automation test plan for new features.

Lucent Technologies, Landover MD 4/2001 - 3/2005

Member of Technical Staff - Software, PSAX Media Gateway Product Line

Generate software technical requirement document for H.248 features, such as multi-threaded client/server, basic DTMF tones generator package, call progress tones generator package, layer management entity module, automatic card support, fractional PRI and H.248 module information store in disk, etc according to customer requirement and commercial specification.

Create software design document for each VoIP features to validate the finalized high-level software design, including data design, architectural design, component-level design and user interface design, generated design review document.

Write software unit test plan to validate the proper functioning of the delivered prototypes and to identify any problems and worked with test engineers to implemented automation test plan.

Design and implement features for tone announcement server module, including sequentially play out call progress tones, DTMF tones and announcements, line tests, continuity test, in-band digit collection and CAS signaling (R1 and R2). Improved communication process with upper layer tasks using message queue and management cells to DSP cards and other I/O cards, such as Ethernet, Gigabit Ethernet, high density DS1/E1, channelized DS3, OC3 and OC12. Developed retention plan for primary CPU down, back up CPU take over.

Propose and complete features that let user select one of the transport layer protocols: TCP, UTP and SCTP to transport user data through IP network. Complete automation test bed for test SCTP protocol under Sun Microsystems Solaris UNIX development environment.

EDUCATION

M.S. in Computer Science

Hood College, Frederick MD

B.S. in Telecommunications Engineering

Beijing University of Posts & Telecommunications, Beijing

CERTIFICATION

CCNA, CCNA Voice: CSCO11740175

ITIL Foundation: GR750010169DS

TECHNICAL ADDENDUM

VoIP: SIP, MGCP, SIGTRAN, LNP, ISUP, MEGACO (H.248).

Switching: STP, VLAN, Trunking, VTP, EtherChannel, Port Security, ARP, HSRP, VRRP, GLBP, SPAN.

Routing: BGP, eBGP, iBGP, OSPF, EIGRP, IGRP, IS-IS, RIP, Static.

Program Skill: C/C++, Python, Perl, Java, HTML, Visual Basic, FORTRAN, Assembly Language

Telephony Network: PSTN, SS7, DOCSIS, Packet Cable, ISDN-PRI, ISDN-BRI, IMS, CDMA, GSM, ATM, MPLS, SONET, TDM, PBX, DSL, T1/E1 CAS, DPNSS, QSIG.

IP Protocols: IPV4, IPV6, TCP/IP, RTP/RTCP, Ethernet, MPLS, DNS, NAT, PAT, DHCP, ICMP, SCTP, TELNET, FTP, SNMP, HTTP, TFTP, PPP

OS/Environments: Windows 95/98/NT/2000/XP, Unix, Linux, PC-DOS, VxWorks, pSOS, RTXC

Software Configuration Management: CVS, Microsoft Visual SouceSafe, Clearcase, Lotus Notes

Voice test tools: Protocol monitors, Voice quality analyzers, Call generation tools

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