octoScope

Mimi Tam

Mimi Tam

Mimi brings valuable knowledge of wireless multimedia and seamless mobility applications. She has over 23 years of experience with carrier grade network architecture and testing. Mimi held lead technology and product development roles at companies including Motorola, PictureTel, IBM, Davox and Computer Associates. She worked on Media Gateways, SIP Proxies, Fixed-Mobile Convergence software and IMS. Her career has progressed from hands-on software development to engineering management to lead architecture roles. She has worked with wireless protocols including GSM/GPRS, UMTS, WiMAX and LTE and is experienced with GR303, V5.2, H.323, MGCP, Megoco H.248 and SIP. Mimi has degrees in Economics and EE.

Personal Profile

  • Over 23 years in the Telecommunication / Wireless embedded Software Engineering industry. A Senior Technologist, Systems Architect, Product Manager, IP Subject Matter Expert and Wired & Wireless Protocol Specialist, active in Standards committees with vision and passion to conceive, develop, and implement innovative products. Possess both technical and business knowledge in all areas related to VoIP, IMS and WiMAX.
  • VoIP SME (subject matter expert) and associated signaling protocols for both session establishment (SIP) and media transport (RTP). Experienced with most legacy telephony signaling protocols such as Q.931, SS7, CAS, etc. and packet signaling protocols such as H.320, H.323, MGCP, Megaco H.248, etc, with expert knowledge in SIP and other IP technologies.
  • IP SME proficient in protocols like IP/MPLS VPNs, Routing (BGP, OSPF, RIP…), VLANs, DHCP, DNS, etc.
  • Working experience in WiFi, GSM/GPRS, UMTS/3G, WiMAX, 4G LTE (E-UTRAN/EPC).
  • Working experience with SGSN, GGSN, PDSN, HA, B-RAS and W-RAS.
  • Worked on BPON and GPON embedded software and hardware products.
  • Experienced in multi-media processing and IMS architecture. Well versed in wired/wireless Standards and can undertake complex system level issues related to Metro Ethernet, Sonet, SDH, IPTV and Wireless, influence software changes based on analysis of field/protocol/other issues. Conducted technical and feasibility studies on Seamless Mobility architecture for any access network types.
  • Experienced in managing large and challenging technology development programs as well as projects. Expert level in ‘C’ and ‘C++’, OOD and OOP.
  • Experienced in directing, leading and growing a highly talented and high-performance development team of software engineers, quality assurance engineers, system engineers and technical support engineers.
  • Demonstrated excellent ability to deal adeptly with customer, internal executive, and multiple borderless / offshore and cross functional teams in technical and non-technical settings.
  • Demonstrated excellent capability to communicate company’s vision and strategy roadmaps. Know the essential art of listening to customer requirements, and align program teams accordingly to archive goals successfully and on time.
  • Experienced in Traffic engineering methodologies and measurement metrics as well as IP Traffic prediction models like heavy-tailed distribution, self-similarity and long range dependency traffic modeling techniques.
  • International (mainly Germany, Belgium, Kazakhstan, Brazil, Singapore) and domestic work experience via direct interaction with Carriers, Partners, Resellers and Customers and actively participating in industry forums and Standard bodies and committees.

Professional Experience

02/2008 – 12/2008 Mutualink, Inc. Westford, MA
Director of Engineering (very much technically hands on, churning out code daily)

  • Churned out new source code as well as routinely did Code Inspection on engineers’ work.
  • Maintain existing system and to support any technical and non-technical problems from the field.
  • Build an engineering team and start new processes and practices within the engineering organization. Mutualink is an entrepreneurial venture.
  • Oversee Engineering team to ensure successful releases of commercial products. (Product is a Network Interoperability solution (hw and sw) for different radio endpoints (i.e. from different Access Technologies) to share Audio, Video, Files and text messaging in time of crisis. Targeted customers are: Fed / State Government and Public Safety Agencies e.g. FEMA, State Police with hospitals, malls, schools and any public establishment that concerns about public safety.
  • Plan projects and resource allocations.
  • Write source code and inspect source code.
  • Manage also the Software engineering team, System engineering team, QA team and offshore engineers. Work closely with CTO to set technical directions for the company.

04/2006 – 02/2008 Motorola, Inc. Lowell, MA
IP SME <Subject Matter Expert> Global Professional Services Organization (End-to-End Networks & Systems Architectures – Wired & Wireless)

  • Responsible for tracing and supporting End-to-End architecture & design delivery of RAN (WiMAX, CDMA, Metro WiFi), wired/wireless backhaul, MPLS Transport backbone networks and pure IP and IMS core networks in the Services: Support organization. Also, providing design and architecture support for Network dimensioning and optimization services; RF dimensioning services, OSS/BSS, IP-TV and other solution bundles offered as service packages.
  • Function as a technical point-person for consultancy in the areas of WiMAX/4G, LTE, IMS and IP Transmission standards and protocols.
  • Worked on the Mobility & Roaming architecture sections of the TISPAN and E-UTRAN/EPC LTE ARD and SAD (Architecture Requirements Doc & System Architecture Doc)
  • Designed a full Mobile WiMAX Access Service Network (ASN) Up-&-Running Service Package and working on defining the implementation process for this service package.
  • Technical Patent Reviewer for IPRs in the areas of: 4/6 Alternate Networks, Ad Hoc Networks, Audio/VoIP, Connected Auto/In Vehicle Gateway, Context-Aware and Location Applications,  Residential Gateway and Wireless Link Performance (wired or microwave) backhauls (the STAR patent committee) and for IPRs relevant to IMS (the CORE patent committee).
  • Engineering resource for an Intelligent Traffic Engineering Data Modeling tool which provides a unique analytical modeling technique specific for IP traffic patterns for analyzing queuing systems that have heavy-tailed burst size distributions, a new approach and methodology adopted for providing analysis through the approximation of heavy-tailed distributions with hyperexponential distributions.
  • Investigations into RF Dimensioning tools and drive test tools for 802,16e-2005 air interface.
  • Conduct WiMAX & IMS workshops for customers in Brazil, Mexico and other regions. Also, for in-house solution architects & engineers.

10/2003 – 04/01/2006 Sentio Networks, Inc. Acton, MA
Technical Lead/System & Software Architect

  • Responsible for leading forward looking strategic development initiatives in addition to serving as the lead architect, designer and developer on critical path features.
  • Prototyped wireless protocol stacks in demo systems.
  • Did R&D on Fixed-Mobile Convergence and IMS development. Also on VoIP E911 & CALEA Support.
  • Redesigned legacy Call Control Systems to dynamic FSMs for existing Apps: PRI, IMT, CAS, GR-303 and others.
  • Project Lead for new developments from the ground up GR-303, MGCP, CASMF-R1 and others.

10/2000 – 10/2003: Integral Access, Inc. Chelmsford, MA
Team Leader, Embedded Signaling Software

  • Led a team in the development of a subscriber-side ISDN 16-port U-Interface board, terminated by NTs (modems) and 4-port voice ISDN S-interface IADs, uplink G.SHDSL.
  • One of two leads in the V5.2 project team to define, design and develop V5.2 stack being utilized in Access Network platform and interoperate with Siemens’ EWSDs.
  • Voice deployment of the V5.2 offerings in the German market. Worked off-site as a designer/developer in Limburg, Hamburg, Hanover and Aalen, Germany in 1st deployment of Voice Services as well as problem solving.
  • Led V5 PSTN National Variant feature for the Kazakhstan PSTN & ISDN deployment.
  • Successfully managed V5 certification with Siemens’ EWSD in Munich, Germany.
  • Led a development team in the design and implementation of the GR303 Flow Through Provisioning feature utilizing 3rd party vendor software.
  • Actively participated in the POTS development with GR303, and T1 / E1 HDLC framer development.
  • Developed strong working knowledge of RDT / LDT, AN / LE Simulators from Spirent’s Abacus (ACG, SCG, BCG, PCG & XCG cards), Schlumberger’s S765ITV and digital network monitor Helix for both GR303 and V5.
  • R&D into WiFi 802.11, EV-DO, TDMA, CDMA and CDMAone.
  • Strong technical knowledge of embedded programming using C & C++ on Linux; and MQX for RTOS.

9/1999 – 10/2000: Davox Corporation, Westford, MA
Technical Director

  • Researched & participated in the re-design of the next generation Telecom System.
  • Strong hands-on experience with LAPD & Q.931 layer-2 & layer-3 protocols.
  • Employed and used SIP, H.323, H.320, H.221, MGCP & MEGACO H.248 protocol stacks in prototyping System Networks.
  • Provided technical leadership to two development teams (in Mass. & Texas) in fulfilling product requirements from a technical perspective.

9/1998 – 10/1999: Ezenia, Inc. (VideoServer, Inc.), Burlington, MA
Principal Software Engineer / Project Lead

  • Built Videoconferencing software. - GateKeeper, NetServer & MCU boxes.
  • Designed systems implementing ITU-T standard protocols H.323, H.221, H.245 / multi-media (audio, video and data) over IP.
  • Gained strong knowledge of data sharing protocol (T.120) for data & application sharing over IP, and RTP/RTCP protocols.
  • Actively participated as a study group member of ITU-T of Geneva, Switzerland representing VideoServer as a member company.
  • Technically evaluated 3rd party software component vendors.
  • Designed real-time video streaming software using MS Windows tools.
  • Extensively used C++ & C for software development and implementation.

6/1997 - 9/1998: PictureTel Corporation, North Andover, MA
Principal Software Engineer / Project Leader

  • Designed and developed a H.323 Server product that included gateway, configuration, bandwidth management, endpoint provisioning, workgroup provisioning and call center features, using VC++ and DCOM on Windows NT.
  • Gained working knowledge of XML via formal training course.
  • Project lead on a web-based multi-platform client product for the Gatekeeper Server. Designed and developed using Visual Café 3.0 and JDK on Windows NT.
  • Understanding of MC, MCU, net-conferencing and Gateway software (H.320 – H323 translation).

8/1994 - 6/1997: IBM – Lotus Development Corporation, Westford, MA
Principal Software Engineer/ Project Leader

  • Developed Imaging applications and tools for Fax Servers, Image Viewer, OCR and Scanning applications using MS-Visual C++, MFC, OLE, VBX and OCX.
  • Developed and implemented Pager Gateway, a wireless messaging service (local and roaming) using C++, SDK within WIN32 and Domino. Wireless data transmission and receiving was done using Remote Procedure Call (RPC).
  • Integrated One-Way Pager and SkyTel’s 2-way pager with the Lotus Domino server using C++, SDK and WIN32. Researched and wrote a white paper on radio frequency (RF) - narrow band and spread spectrum technology, Infrared (IR) - line of sight and diffuse.
  • Developed and implemented Telephony One Stop which consisted of Intuity Audix to translate voice to text deposited into Notes Mail and text to voice receivable from the telephone. Development was done using C++, SDK, WIN32 and Lotus Domino.
  • Provided R&D leadership on wireless mobile computing and wireless networking on LAN, MAN and WAN which included close engagement with AT&T and Bell Atlantic on shared technology. Researched TCP/IP protocol implementations, GSM, TAP, Radio based wireless LAN configuration, single cell wireless and multiple cell wireless. Researched GPS/Wireless applications combining CDPD and paging with GPS.
  • Devised an Object-Oriented model for unified design approach of Jacobson, Rumbaugh and Booch.

7/1989 - 8/1994: IBM - Lotus Development Corporation, Cambridge, MA
Principal Software Engineer

  • Multi-Media Team - Intel ProShare Camera R&D for Desktop PCs & Integration of multi-media <audio & video> with Lotus Notes.

5/1987 - 7/1989: Computer Associates, North Andover, MA
Senior Software Engineer

  • 4th generation 'C' compiler project: Worked on building a 4th generation ‘C’ Compiler in C.

5/1985 - 5/1987: BayBank Systems, Waltham, MA
Senior Engineer/Analyst

  • Worked on the ATM system in Assembler Language.

Education

  • 1982 Jinan University – MS equivalent in Economics and EEE (Electrical & Electronic Engineering).
  • 1983 – 1998 – Completed a large volume of Graduate EE & Professional programs while working full time at:
    • Northeastern University
    • Boston University
    • Harvard Extension School
    • MS Computer Science graduate courses & Professional trainings in EE, AI and RF
  • Completing a Master of Science degree in Advance Technology and Business Management at the Robert Kennedy College of the University of Wales.
  • Continuing with the MIT Sloan Executive Certificate Track 2009 at MIT Sloan School of Management.

Professional Affiliations

  • Senior IEEE Member and Volunteer as Industry Liaison (8/1995 – Present)
  • Society of Women Engineers (life-long member)
  • Federation of American Scientist (life-long member)
  • Society of Cable Telecommunications Engineers (SCTE) – Voting member
  • International Executive Guild Member (1/1999 – Present)
  • ITU-T member of SG11 and SG16, TIES member (2/1998 – 2003)
  • NH Justice of the Peace (1/1996 – Present)
  • NH Notary Public (2/1995 – Present)
  • NENA (National Emergency Number Association) member (E9-1-1)

Key Technology Expertise

  • Mobility Enterprise Server Solutions
    • IPTV
    • Mobile Money
    • Performance & Monitoring applications
    • Others
  • 2.5/3G/4G Wireless Network, including Fixed-Mobile Convergence
    • 802.11x, WiFi Mesh networks, WiMax - 802.16x, Mobile Ad Hoc Networks – E2E QoS, Security, Traffic Engineering
    • 3G-IMS, UMA, SIP-FMC, GSM/CDMA, GPRS
    • 802.16d-2004, 802.16e, 802.3ad (Ethernet aggregation)
  • IP/MPLS Backbone Transport Network
    • VPLS, L2VPN, V3VPN, PPPoE, DHCP clear IP,
    • Microwave, Satellite, Fibre Backhaul (last mile, 1st mile transport)
    • RAN / ASN to CSN connections & architecture
  • Next-gen VoIP Architecture - all key components and protocols
    • SIP/PSTN Trunk Gateways, Proxy Servers/Signaling Gateways, Application Server, Softswitches, SIP B2BUA, Access Gateways.
    • SIP (SDP, SIP Proxy, feature servers and other SIP extensions) and H.323 protocols.
    • MGCP and MEGAGO/H.248.
    • Network Processors, Telecom purpose-build DSPs.
  • Comprehensive security framework for VoIP and Wireless Networks
    • IPSec, TLS, NAT, dynamic pinholing, SSH, DOS, ICMP, SYN flood.
  • Voice, Data, and Video Platforms, Protocols, Interfaces, and Tools
    • SS7, PRI, CAS loop-start / ground-start, CAS/MF R1, E&M, GR-303 & V5.2.
    • GR303 – Subscriber side / Access Network (RDT) to traditional class-5 circuit switches (LDT – Lucent 5ESS & Nortel DMS 100 & 500).
    • POTS, ISDN, LDT and LE Simulators from Spirent’s Abacus (ACGs, SCG, s BCGs, PCGs & XCGs), Schlumberger’s S765ITV and digital network monitor Helix for both GR303 and V5.
    • T1/E1 Framer HDLC Rx and Tx processing.
    • V5 PSTN Autonomous Signaling, cadence ringing, pulse / steady signals.
    • V5.1 and V5.2 – ETSI Standard of stack between AN and LE via E1 links.
    • Familiar with ITU-T’s Q.921 (LAPD, LAPV), Q.931 and other Signaling standards and protocols. All ETSI Specs related to V5.1, V5.2, PSTN National Variant, ISDN UNI, etc.
    • IADs with POTS and Ethernet ports, uplink via SDSL / E1 / DS3 / FENET 100BT / 100BF (optical laser and LED) and MLIAP trunks.
    • Infineon ISDN U-interface chip-set. Mitel ISDN S-interface chip-set.
    • IADs with ISDN S-interfaces and Ethernet ports via G.SHDSL uplink.
  • Real-time Operating Systems and Languages
    • RTOS: VxWorks, Linux, C, C++
  • Active participation in Standard bodies and Industry forums
    • IEEE, ITU-T, TIES, NENA, SCTE
  • Web server, GUI and remote applications

© Copyright 2012. octoScope

Tel: +1.978.222.3114 • Info@octoScope.com • Fax: 1.866.401.5382

Sitemap   Privacy Policy