Networking For Engineers

𝗨𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱𝗶𝗻𝗴 𝗜𝟮𝗖, 𝗦𝗣𝗜 & 𝗨𝗔𝗥𝗧: 𝗧𝗵𝗲 𝗦𝗶𝗹𝗲𝗻𝘁 𝗛𝗲𝗿𝗼𝗲𝘀 𝗼𝗳 𝗘𝗺𝗯𝗲𝗱𝗱𝗲𝗱 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 If you've ever written embedded C/C++ code for a microcontroller, you've probably used one of these protocols to make hardware components talk to each other. 💬 Need to send sensor data? Display something on an LCD? Store to external memory? That’s where I2C, SPI, and UART come in your essential communication tools in embedded development. Here’s a quick breakdown: 👉 𝗨𝗔𝗥𝗧 (Universal Asynchronous Receiver/Transmitter) 🔌 • Point-to-point, asynchronous communication • No clock signal needed • Common for serial communication between PCs and microcontrollers • Simple, low-cost but not ideal for multiple devices 👉 𝗜𝟮𝗖 (Inter-Integrated Circuit) 🔄 • Synchronous, 2-wire protocol (SDA & SCL) • Supports multiple masters and slaves • Ideal for sensors and peripherals with unique addresses • Slower than SPI, but scalable and efficient 👉 𝗦𝗣𝗜 (Serial Peripheral Interface) ⚡ • Synchronous, full-duplex communication • 4 lines: MISO, MOSI, SCLK, SS • Extremely fast, great for displays, SD cards, memory chips • Needs extra wiring for multiple devices 𝗪𝗵𝘆 𝗱𝗼𝗲𝘀 𝘁𝗵𝗶𝘀 𝗺𝗮𝘁𝘁𝗲𝗿? Choosing the right protocol impacts 𝘀𝗽𝗲𝗲𝗱, 𝗽𝗼𝘄𝗲𝗿 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝗰𝘆, 𝘀𝗰𝗮𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆, and 𝗰𝗼𝘀𝘁. Mastering these “invisible” connections makes your embedded systems more reliable and optimized, whether it’s a smartwatch or an industrial controller. #EmbeddedSystems #IoT #Electronics #I2C #SPI #UART #Microcontrollers #EmbeddedC #Cpp #C

Exploring the Nuances of Communication Protocols: A Deep Dive into I2C, SPI, and UART In the rapidly advancing field of electronics, understanding communication protocols is crucial for designing efficient and reliable systems. In my latest article, I delve deep into three fundamental protocols—I2C, SPI, and UART—that form the backbone of modern electronic communication. I2C (Inter-Integrated Circuit): I2C shines with its minimal pin requirement, utilizing just two lines: SDA (Serial Data Line) and SCL (Serial Clock Line). This simplicity enables easy integration of multiple devices on the same bus, making it perfect for compact circuits and short-distance communications. The addressing scheme allows up to 127 devices on a single bus, facilitating complex sensor networks in embedded systems. However, I2C operates at relatively lower speeds, typically up to 3.4 Mbps in High-Speed Mode, which might not suffice for high-bandwidth applications. Its reliance on pull-up resistors and open-drain configuration makes it sensitive to capacitance and interference, potentially leading to signal degradation over longer distances. Careful bus design and termination are essential to mitigate these limitations. SPI (Serial Peripheral Interface): SPI stands out with its high speed and full-duplex capabilities. It uses separate lines for data transmission (MOSI - Master Out Slave In and MISO - Master In Slave Out), along with a clock line (SCLK) and one or more chip select lines (SS). This configuration allows for data rates exceeding 10 Mbps, making SPI ideal for high-speed peripherals like TFT displays, SD cards, and wireless modules. The trade-off with SPI is the increased pin count and complexity. Each slave device typically requires a dedicated chip select line, consuming valuable GPIO pins on the microcontroller and complicating the circuit when multiple slaves are involved. Unlike I2C, SPI lacks a standardized protocol for addressing multiple devices on the same bus, necessitating careful planning and additional hardware like multiplexers or shift registers for complex systems. UART (Universal Asynchronous Receiver/Transmitter): Lastly, UART's simplicity and flexibility make it a go-to for point-to-point serial communication over longer distances. With only two wires (TX and RX) and asynchronous communication, UART eliminates the need for a shared clock signal, allowing devices to communicate even if they operate at different clock speeds, provided they agree on the baud rate. #Electronics #CommunicationProtocols #I2C #SPI #UART #EmbeddedSystems #HardwareDesign #Engineering #TechInnovation #ExpertInsights

What does IPMX reveal about about AV's relationship with network switches - and the importance of understanding them properly? The Skills Gap Nobody Discusses. IPMX adoption is accelerating. Testing events show genuine interoperability across vendors. Commercial products are shipping. The specification is maturing rapidly. But there's an uncomfortable truth emerging: many AV professionals lack the network configuration expertise IPMX demands. What Network Switches Actually Require. This isn't about plugging cables into ports. IPMX deployments require understanding: * IGMP snooping configuration per VLAN to prevent multicast flooding * QoS policies that prioritise time-sensitive AV traffic over data * VLAN segmentation that isolates AV from corporate networks * Buffer sizing and processing power to handle burst traffic * Bandwidth management across 1Gbps to 100Gbps links These aren't optional extras. They're fundamental requirements that determine whether systems work reliably or fail intermittently. The IT/AV Convergence Reality. Everything moves to the network eventually. But getting AV devices onto the network successfully requires IT-level networking knowledge. Research suggests a significant proportion of integrators report skills shortages in this area. The gap isn't about whether AV professionals are capable of learning networking - it's that they haven't needed to until now. Traditional AV distribution used dedicated cabling. IPMX changes that fundamentally. Standards Enable Success. This is where AVIXA and AV-related standards become essential. IPMX provides the open standard for interoperability. But knowing how to implement it properly separates successful deployments from problematic ones. My bi-weekly newsletter 'Industry Standard' explores subjects such as AVoIP, IPMX, and related networking topics. Subscribe: https://lnkd.in/ekQ3AdCb The Strategic Opportunity. For AV professionals who invest in network switch expertise now, competitive advantage follows. Understanding switch configuration, VLAN management, and QoS implementation isn't just technical competence - it's what separates those who can deliver reliable IPMX systems from those who struggle. Are you upskilling in network switch configuration? What's been your biggest challenge with AVoIP networking? #AVTweeps #AVoIP #IPMX #MicrosoftTeamsRooms #AVIXA #AVUserGroup #LTSMG #Schoms

In my early career, I thought networking was all about building as many connections as possible. But I quickly learned that effective networking isn't about the quantity of your connections—it's about the quality. Throughout my career, the connections that have truly made a difference weren’t the ones where I just asked for help—they were the ones where I made it easy for others to want to help me. If you want to make others genuinely want to help you, it’s crucial to move beyond simply asking for favors. Instead, focus on creating value and building relationships where both parties benefit. So, how can you do the same? Here are four tactical tips to help you network effectively: ✅ Do Your Homework Before reaching out, research the person or company you’re interested in. Understand their work, challenges, and how you can add value. For instance, instead of asking a connection for job leads, do your own research first. Identify specific roles and companies you’re targeting, and then ask if they can help with an introduction. This approach shows initiative and respect for their time. ✅ Be Specific in Your Ask Whether you’re asking for an introduction, advice, or a referral, be clear and concise about what you need. For example, instead of asking, “Do you know anyone hiring?” say, “I noticed [Company Name] is looking for a [Role]. Would you be open to introducing me to [Person]? I’m happy to send you my resume and a brief write-up you can pass along, too.” This shows that you’ve taken the initiative and makes it easier for your contact to say yes. ✅ Offer Mutual Value When requesting a meeting or advice, frame it as a two-way conversation. Instead of saying, “Can I pick your brain?” try something like, “I’d love to exchange ideas on [specific topic] and share some strategies that have worked for me.” This not only makes your request more compelling but also positions you as someone who brings value to the table. ✅ Follow Up with Gratitude After someone has helped you, don’t just say thank you and disappear. Keep them in the loop on how their help made an impact. Whether you got the job, secured the meeting, or just had a great conversation, let them know. This closes the loop and makes them more inclined to help you in the future. Your network is one of your greatest assets—nurture it well, and it will be there for you when you need it most. What’s one networking tip that’s helped you build stronger connections? *** 📧 Want more tips like these? Join Career Bites - free weekly bite-sized tips to supercharge your career in 3 minutes or less: lorraineklee.com/subscribe 📖 You can also get behind-the-scenes stories, updates, and special gifts for my upcoming book Unforgettable Presence: lorraineklee.com/book

Silicon Photonics in 2026: The Shift From Trend to Transition LightCounting’s forecast—over 50% of optical transceiver sales using silicon-photonics modulators in 2026 up from 10% in 2018—represents a dramatic industry inflection. This shift is being driven by four major forces: ✅ 1. Explosive Bandwidth Demand from AI Clusters AI workloads (ChatGPT-class models, large-scale training clusters, hyperscale inference) require: • 800G → 1.6T optical transceivers • low power / low-latency interconnects • tight integration between compute and optics Electrical interconnects saturate around a few centimeters at >100 Gbps. Silicon photonics eliminates these physical limits, enabling co-packaged optics and eventually optical I/O directly integrated with advanced packaging. ✅ 2. Foundries Reconfiguring Their Roadmaps for SiPh The foundry landscape is shifting from small experimental lines to full commercial 300 mm manufacturing. The table you shared captures this transformation. ✅ 3. Wafer Transition: 200 mm → 300 mm This is one of the biggest structural shifts. Why 300 mm matters: • Better uniformity of waveguides and modulators • Higher yield for photonic components • Economies of scale similar to CMOS • Better compatibility with advanced packaging As transceiver volumes scale with AI datacenters, 200 mm lines (like Tower’s current base) cannot meet hyperscale demand. Most commercial deployment in 2026+ will rely on 300 mm. ✅ 4. Packaging Becomes the Real Battlefield Silicon photonics != complete system The real bottleneck is packaging and fiber alignment. Three major approaches are emerging: 1. Co-Packaged Optics (CPO) Optical engines integrated beside switch ASICs. TSMC and Nvidia are pushing this. 2. Pluggable Transceivers Using SiPh Still dominant today (800G / 1.6T). GF and Intel lead here. 3. Optical I/O / Optical Chiplets Future vision — optical communication directly connected to compute tiles. This requires: • ultra-low-loss coupling • integrated lasers or hybrid bonding • photonic + electronic co-design Expect early pilot deployments around 2027–2028.

Don't reach out cold until you have spoken and reconnected with all these people first and have asked for AIR + explained exactly what you are looking for. 🎈 Advice - career advice, job search advice, career pivot advice 🎈 Information - What's going on in the company, industry? What trends are they seeing? 🎈 Recommendations - Who do they recommend you speak with to learn more? What professional associations or groups do they recommend? Where do they go or what do they read to stay current? 🎯 Contact ALL these People So They Know What You Are Looking For 1. People You Used To Work With Your past work colleagues have seen you perform in the job and know your strengths and work ethic. These people make an excellent source of information to find out what changes are going on in the business and industry. You want to let them know you are looking for a new opportunity. 2. Friends, Family, Neighbors People you know are most likely to want to help you if they can. Your friends have a vast network of contacts you don’t know about. 3. Past Managers Assuming you and your previous manager or supervisor got along, it’s a good idea to reach out to them. Your past boss may know of upcoming opportunities at your old company 4. Target Company Employees Talking with people who work inside a company you're interested in allows you to learn what it is really like to work there. Plus they can provide advice and/or insight on the best way to apply. 5. Alumni/Classmates Don’t forget to tap into classmates, professors, and alumni as another potential pool of people to network with. Use LinkedIn's Alumni tool plus your school’s Advancement or Alumni office database. 6. Customers/Clients The people you’ve served already know you and are familiar with your work. Lean on them as a source of information about what’s going on. Your customers and clients have a feel of the work landscape and future needs. This information will help you position your most important skills and experience. 7. Vendors/Suppliers Similar to your clients and customers, these people know what it’s like to do business with you. They also have a finger on the pulse of what’s happening in your industry because they are still servicing businesses. 8. Service Providers (Doctors, accountants, hairdresser, etc.) Don’t overlook the business relationships you have with professionals who provide you with services. These people have their own vast network of contacts. 9. Fellow Volunteers If you volunteer, you’ve likely established relationships with other volunteers and people within the organization. These people have seen you give your time and effort.

Power over Ethernet (PoE) Power over Ethernet (PoE) enables simultaneous power and data delivery over a single Ethernet cable, eliminating the need for separate power supplies and simplifying installations. 🔷 Key PoE Configurations: ✅ PoE Switch → PoE DeviceDirectly powers and connects PoE-compatible devices (e.g., IP cameras, VoIP phones). ✅ Non-PoE Switch + PoE Injector → PoE DeviceA PoE injector adds power to the data signal, enabling PoE device operation. ✅ PoE Switch + PoE Splitter → Non-PoE DeviceA PoE splitter separates power and data, allowing a non-PoE device to function. ✅ Non-PoE Switch + PoE Injector + PoE Splitter → Non-PoE Device Uses both an injector and splitter to power non-PoE devices via a non-PoE switch. ✅ High-Power Devices: Even with a PoE switch, some devices, like high-power PTZ cameras or certain access control panels, might require more power than the switch's ports can provide. In these cases, a PoE+ or PoE++ injector can supplement the power supply. ⭕ PoE Standards & Power Levels: ◼️ PoE (802.3af): Up to 15.4W ◼️ PoE+ (802.3at): Up to 30W ◼️ PoE++ (802.3bt): Up to 60W (Type 3) / 90W (Type 4) Key Considerations: ✅ Cable Quality: Use Cat5e or higher for efficiency. ✅ Max Distance: 100m (328ft) per Ethernet segment. ✅ Power Budget: Ensure the switch or injector meets device needs. Benefits of PoE: 🔹 Simplified Installations – Fewer cables, no need for AC power. 🔹 Cost-Effective – Reduces electrical infrastructure costs. 🔹 Scalability – Easily expand networks without additional wiring.

1️⃣ Internet (ISP 1 & ISP 2) ISP = Internet Service Provider Two ISPs are used for redundancy & backup If ISP 1 fails, traffic automatically switches to ISP 2 This design is called Dual WAN / High Availability Purpose: ✔ Always-on internet ✔ Business continuity 2️⃣ Fortinet Firewall This is the security gateway of the network. Main Functions: Firewall – blocks unauthorized access NAT – private IPs to public IP VPN – site-to-site & remote access IPS / IDS – intrusion prevention & detection Web filtering – block unwanted websites Load balancing – between ISP 1 & ISP 2 Why Fortinet? Enterprise-level security Very common in banks, offices, ISPs 📍 Position: Between Internet and Internal Network 3️⃣ Core Switch The heart of the internal network. Role: High-speed switching Connects firewall to distribution layer Handles large traffic volume Usually Layer 3 capable Characteristics: 10G / 40G ports Very fast & reliable No end devices connect here 4️⃣ L3 Distribution Switches (2 switches) These are Layer 3 switches. Functions: Inter-VLAN routing Network segmentation Load sharing Redundancy (two switches used) Example: VLAN 10 → Users VLAN 20 → Printers VLAN 30 → Voice (IP Phones) They route traffic between VLANs before sending it to access switches. 5️⃣ Access Switches These switches connect end-user devices. Connected Devices: PCs Printers IP Phones Servers (sometimes) Functions: VLAN assignment PoE (for IP phones) Port security Basic switching 📌 This is where users actually connect 6️⃣ End Devices Shown at the bottom: 🖥️ PC User workstations Assigned IP from DHCP Belongs to a VLAN 🖨️ Printer Network printer Can be restricted by VLAN or ACL ☎️ IP Phone Uses VoIP Usually on Voice VLAN Gets PoE from access switch 7️⃣ Traffic Flow (Simple) PC / Printer / IP Phone ↓ Access Switch ↓ L3 Distribution Switch ↓ Core Switch ↓ Fortinet Firewall ↓ Internet 8️⃣ Why This Design is Used (Benefits) ✔ High availability ✔ Scalable network ✔ Strong security ✔ Easy troubleshooting ✔ Enterprise standard design This is called Three-Tier Network Architecture: Access Layer Distribution Layer Core Layer 9️⃣ Certification Relevance (Important for You) Since you passed CCNA 200-301, this diagram relates to: CCNA – Basic understanding CCNP Enterprise (ENCOR 350-401) – Deep knowledge Real-world enterprise networks 📌 Why this matters? This improves performance, security, scalability, and fault tolerance, making it ideal for enterprise & campus networks. 💬 If you’re learning Cisco Networking, CCNA/CCNP, or designing real-world topologies, this is a must-know! 🔁 Like | 💬 Comment | 🤝 Connect Let’s grow together in the networking community. #Networking #Cisco #InterVLAN #RouterOnAStick #NetworkDesign #CCNA #CCNP #EnterpriseNetwork #ITInfrastructure #Learning

🤦🏼♀️You don’t know what networking is. Sending a cold dm to a stranger on LinkedIn isn’t networking, it’s asking a stranger for help. It’s telling someone you need a job. And that’s fine and you need to do that but don’t get it twisted that is NOT networking. 🟢Networking is building relationships. 🟢Networking is getting to know other people. 🟢Networking is not about YOU. Here are some tips on how to network 1. Shift Your Mindset 🧠 Give first: Don’t just ask for favors; ask, "How can I support you?" or share helpful resources.   2. Be Selective 📈 Quality over quantity: One meaningful conversation is better than cold emailing 50 cards strangers. Personalized outreach: Never send a generic connection request. Add a note mentioning a shared interest, a recent article they wrote, or a mutual connection.   3.Long-term focus 📆 Networking is a marathon. Cultivate relationships before you actually need a job or a favor.     4. Be Ready 💃 Have your pitch down. Know your unique value proposition. Be memorable. 5. Leave the house 🚗💨 Go to in person industry events, conferences and happy hours. Play pickle ball. Go with your friend to their work event. Join a chamber of commerce. Make friends at a café. 6. Don’t be shy 🤝 How to break the ice: Approach people standing alone or in groups of three (they are easier to enter than pairs). Introduce yourself simply and ask open-ended questions like, "What brought you out here tonight?" or "What exciting projects are you working on?" 7 Follow Up 📱 The 48-hour rule: Always follow up within 48 hours of meeting, send a thank you note or a thank you. Better yet send an article or resource that connects back to the conversation you had. (Go back to step 1 be a resource) Mention something specific you discussed (e.g., "I loved hearing about your experience transitioning into tech") to jog their memory   8. Be active on social 👩🏼💻media: Share industry insights, comment on others' posts, and reach out to professionals for 15-minute informational interviews.   9- Nurture consistently 🎯 Check in occasionally with a quick text or email just to share a relevant article, say congratulations on a milestone, or see how they are doing   10- It’s not about YOU🤗Networking is about building a relationship that is mutually beneficial. GIVE VALUE. #howtonetwork #careeradvice #jobsearchtips #linkedin

Important Protocols and IP required for Entry level VLSI professionals, internship, and mid level professionals in VLSI & also for someone in the post graduation or pursuing ECE/EEE and CSE. [1] FIFO: FIFO can be categorised into synchronous and Asynchronous FIFO. >> Concepts required: a. Empty and Full Condition. b. Almost Full and Almost Empty Condition. c. Write pointer and Read pointer. synchronisation. d. Gray Pointer. e. Handshaking Protocol. f. FIFO Depth Calculation. g. Difference between Binary and Gray pointer. h. Clock domain crossing. i. Use of Synchronizers in digital circuit. j. MTBF concepts and Failure rate Sources to Learn: Sunburst Design Papers for FIFO. There are two papers of FIFO. [2] I2C: I2C is a communication protocol and uses two bidirectional open drain lines SDA and SCL and operates in either 7 bit or 10 bit addressing modes with a wide range of speeds. >> Concepts to learn: a. Operation of 7 bit and 10 bit addressing modes. b. Use of start and stop bits, ack and nack signals. c. Arbitration. d. Clock stretching and Clock synchronisation e. Different modes of operation. f. Repeated start g. General call address. h. Modes of operation Sources to Learn: --> I2C spec by NXP. [3] APB (Advanced Peripheral Bus): APB is a part of AMBA bus which is basically used for low power peripherals like uart, timer, etc. Besides this Register programming can also be done using APB through RAL depending on the type of adapter being used. >> Concepts required: a. How APB state machine operates. b. Signal list information c. Read/Write transaction concepts. d. Strobe information [4] AHB (Advanced High-Performance Bus): 》Concepts: a. AHB Signal list understanding. b. Burst operation c. Multiple Bus Master d. Early Burst termination. e. Different Response scheme f. Difference between Split and Retry g. How Arbitration work h. Role of decoder I. Two cycle response j. Transfer operation of AHB k. Default Bus Master Sources to learn: ARM Specification #asic #electricalengineering #semiconductorindustry