Network Communications Expert Witness — Protocols, Architectures & Systems
Dr. Tal Lavian has scholarly, research, and hands-on experience in network communications, telecommunications, and Internet technologies. As a telecommunications expert and internet technology expert, Dr. Lavian provides technical consulting in networking, data communications, and computer networks. He also consults on network architectures, Internet and network protocols, communication systems, communication devices, routers, switches, gateways, and packet switching.
Core Focus as a Network Communications Expert Witness
As a network communications expert, Dr. Lavian has worked in software development and system architecture, including network protocols, designs, configurations, installations, and network testing. His work also covers network communications technology products, implementations, related communication, networking standards, hardware, and systems.
Dr. Lavian spent nearly 20 years researching, studying, and lecturing at UC Berkeley, where he conducted research in data center networking (RAD Labs), network service architectures (SAHARA), and wireless systems (ICEBERG). He has co-authored over 25 peer-reviewed publications in networking and telecommunications and has presented at IEEE and ACM conferences. At Nortel Networks (1996–2007), he served as Principal Scientist and Principal Architect, designing network communication systems and leading three DARPA-funded research projects. He has been retained in over 70 engagements involving network communications technologies.
His areas of expertise include:
Network Communications
- Network communications and Internet protocols.
- Packet switching, data networks, computer networks, and network architectures.
- Industry standards: IETF, IEEE, ITU-T, and ISO.
- Datalink, network, and transport layers (L2, L3, L4).
- OSI layers 1-7, including techs and standards in product implementations.
- LAN and WAN technologies: IEEE 802.1, 802.3, 802.11, 802.15.
- Telecommunications, telecom architecture, network infrastructure, network design, switch architectures, and network redundancy.
Internet Protocols (TCP/IP)
- TCP/IP suite, TCP, UDP, IP, MAC, Ethernet, 802.3.
- Communications protocols: TCP/IP, LDAP, ARP, DNS, DHCP, RIP, OSPF, GRE, LAN, WAN, VPN. IPv4 and IPv6.
- Network protocols, network software applications.
- Wired networking: core and edge routers, switches, load balancers, LAN, and WAN.
- Wireless networking: Access Points, Wireless Controllers, and Data and Control Planes.
- Enterprise and Service Provider cable networks Modems, Headends, and Fiber Optic DWDM infrastructure.
- Network Security: Firewalls, VPNs, IPSec, Tunneling, Content Filtering, and Security Gateways.
Routing And Switching
- Routing and switching systems, architectures, LAN, WAN, tunneling, and VPN.
- Routing protocols, RIP, BGP, MPLS, OSPF, IGMP, IGRP, and IS-IS.
- Router, switch, gateway, content switch, L4-L7 switch, load balancers, and network devices – architecture, design, and development.
- Multicast, DNS, QoS, priority queuing and network communication architectures.
- Priority Queuing, Classification, Congestion control, Weighted Fair Queuing (WFQ).
- Bandwidth throttling, Quality of Service (QoS), Priority queuing, and Traffic Classification.
- Network infrastructure and network communication architectures
Voice Over IP (VoIP) And Streaming Media
- Voice over IP (VoIP) protocols, VoIP systems, streaming media, IP telephony.
- SIP, RTP, RTCP, H.323, MGCP, WebRTC. PSTN, SS7, POTS, Pulse Dialing and DTMF.
- Video/audio conferencing, multimedia, and video/audio streaming.
- VoIP Gateways, Gatekeepers, and Terminals.
- VoIP technologies: Jitter, Packet Loss, and Network Delay.
PSTN, VoIP & Cellular Expert
- Public switched telephone networks (PSTN), POTS, PBX. Circuit switching, SS7.
- Implementations of telecommunications and network communication systems, architectures, and standards.
- Transmissions, digital communications, interconnection networks, and network interfaces.
- SONET and SDH, WDM, DWDM, Optical Networks, Optical Transport.
- Quality of Service (QoS) relates to telecom architectures and systems.
Computer Networking
- Internet cloud communications, including Internet Technologies, Web applications, HTTP, e-mail, SMTP, POP, IMAP, Java, C/C++, and file transfer FTP.
- Client-server, cloud computing, and distributed computing.
- Web Services, Internet Applications, and Internet architecture.
- Security Groups, ACLs, Virtual Private Networks, Firewalls, and Network Balancers.
Network Management
- Network Management Systems (NMS), Device Management, and Configuration.
- Management of switches, routers, firewalls VPNs and access points, and servers.
- MIBs, Traps, Logs, SNMP, Monitoring, and Troubleshooting.
- OSI/ISO FCAPS, Faults, Configuration, Accounting, Performance, and Security.
- L2/L3, SNMPv2, SNMPv3, Alarms, Alerts, Traps, RADIUS.
- Topology maps and Reporting.
Mobile & Wireless
- Mobile wireless networks including Wi-Fi, 802.11, Wireless LAN (WLAN), cellular systems, Bluetooth.
- SMS, MMS, instant messaging (chat).
- Mobile devices and smartphones.
- MAC, PHY.
- Wireless techs, 3G, 4G, 5G, LTE, CDMA, GSM, and RAN.
- Software-Defined Networking (SDN).
- TCP/IP, ARP, ARQ, HARQ, QoS, queuing.
Network Security
- Network security architecture
- Firewalls, VPNs, IPSec, Tunneling, Content Filtering, Security Gateways, IDS, and IPS.
- SSL and TLS, SSH, HTTPS, SFTP, SNMPv3, OAuth, SAML, and OpenSSL.
- Authentication and Authorization, Encryption, and Decryption.
- Network Access Control, Digital Certificates Management, and PKI facility.
- Users and devices in commercial networks.
Background
Dr. Lavian holds a Ph.D. in Computer Science from UC Berkeley, specializing in network communications. He spent nearly 20 years researching, studying, and lecturing at UC Berkeley, where he conducted research in data centers (RAD Labs), network communication service architecture (SAHARA), and wireless systems (ICEBERG). He served as Principal Scientist and Principal Architect at Nortel Networks (1996–2007), where he was Principal Investigator for three U.S. Department of Defense (DARPA) projects.
He has testified in over 70 cases before U.S. federal district courts, the USPTO PTAB, the ITC, and international tribunals, involving technologies across the network communications areas listed above. His network communications case work includes Spherix v. Cisco Systems (U.S. Patent Nos. RE40,467 and 6,233,245, among others, involving network protocol and packet switching technologies), Corrigent Corp. v. Arista Networks (U.S. Patent Nos. 7,593,400 and 7,545,740, involving network switching and transport), and WSOU Investment v. Huawei Technologies (U.S. Patent Nos. 6,882,627 and 7,508,755, involving network communication systems). He has been retained by over 50 law firms and corporate clients. He is an inventor of over 120 patents and has co-authored over 25 scientific publications.
Frequently Asked Questions
What network communications topics has Dr. Lavian addressed as an expert?
Dr. Lavian has addressed TCP/IP protocol stacks, Ethernet, LAN/WAN architecture, routing protocols (BGP, OSPF), network switching, quality of service (QoS), and distributed network systems in patent litigation.
How does Dr. Lavian qualify as a network communications expert?
Dr. Lavian has a Ph.D. in Computer Science from UC Berkeley specializing in network communications, nearly 20 years of research and lecturing at UC Berkeley, and over 35 years of industry experience at Nortel Networks and as a startup founder.
Can Dr. Lavian serve as an expert in both plaintiff and defendant cases?
Yes. Dr. Lavian has been retained by both plaintiff and defendant parties in patent litigation matters involving network communications technologies in federal courts and PTAB proceedings.
What network communications patent disputes has Dr. Lavian handled?
Dr. Lavian has handled patent disputes involving TCP/IP protocol implementations, packet switching architectures, network interface cards, quality of service mechanisms, network congestion control, and distributed computing systems for companies including Cisco, Google, Intel, and Microsoft.
How does network communications expertise apply to patent claim construction?
Network communications expertise is critical for interpreting patent claims involving protocol layers, packet header fields, routing table structures, and network stack implementations. Dr. Lavian's 120+ patents and work with the OSI model and TCP/IP stack inform his claim construction opinions for judges and PTAB panels.
What courts has Dr. Lavian testified in as a network communications expert?
Dr. Lavian has provided expert testimony in U.S. federal district courts across multiple jurisdictions, the USPTO Patent Trial and Appeal Board (PTAB) in IPR and PGR proceedings, the International Trade Commission (ITC), the Tax Court in Canada, and a court in Asia.
What is a network communications expert and when do you need one?
A network communications expert is a technical specialist who provides analysis and testimony in legal disputes involving network protocols, data transmission systems, and communication architectures. You need one in patent infringement cases, trade secret disputes, or regulatory matters where network protocol behavior, packet routing, or network architecture is at issue.
How does a network communications expert help in patent claim construction?
A network communications expert helps courts interpret technical patent terms — such as “packet header,” “routing table,” “protocol stack,” and “network interface” — by providing definitions grounded in industry standards (IEEE, IETF RFCs) and the OSI model. Dr. Lavian's 120+ patents in networking give him firsthand insight into how these terms are used by inventors.
For inquiries, contact Dr. Lavian at +1 (408) 209-9112 or via the contact page.