Tech Blog

The PSE port of the PoE switch is not a simple copy and paste of the network port. This article dissects the design points of the PSE side from five dimensions: DC bias magnetism of the network transformer, choice between multi-port integrated magnetic RJ45 and discrete network transformers, crosstalk between ports and Bob Smith termination, three-level surge protection and thermal design, and provides a VOOHU on-rack material number selection table.

Gigabit Ethernet ports on industrial gateways and PLCs often share a cabinet with VFDs and switching supplies, where ground potential differences drive ground loops and common-mode noise couples into the pairs. This guide dissects the physical layer and gives in-stock VOOHU selection answers.

10/100BASE-TX ports are high-volume, cost-sensitive and exposed, and often fail on ESD, lightning surge and EMC. This guide explains the LAN transformer's role and key parameters from the 100BASE-TX physical layer, how ESD/surge damages the PHY, and maps VOOHU's in-stock 10/100 transformers, integrated magnetic RJ45 and GDT+TVS+ESD three-stage protection to a selection table.

Consumer-grade products such as home routers, desktop switches, set-top boxes (STB), optical modems (ONU) and smart-speaker ports share two labels: high volume and cost sensitivity. On a home router shipping in the millions, saving a few cents of port BOM

A gigabit Ethernet port (1000BASE-T) is a near-mandatory feature on almost every switch, router, IP camera (IPC) and industrial gateway board — and it is also one of the interfaces most likely to bite back during bring-up. In the field, engineers ke

Why do IP-camera Ethernet ports drop offline and blow dead every storm season? VOOHU breaks down the three jobs of the RJ45 port—LAN-transformer isolation & PoE current rating, PoE power-transformer sizing for 802.3af/at/bt, and coordinated GDT/TVS/ESD surge protection—with a real part-number selection table for reliable outdoor ports.

From the center tap, Bob Smith terminal to PCB layout, the system sorts out the most common pitfalls of the Ethernet port, and provides selection suggestions based on VOOHU full-rate network transformers and supporting components.

From the PHY and LAN transformer to common-mode chokes and port protection, VOOHU shows how to build TSN determinism on a solid physical-layer foundation, with a selection table for 1G / 2.5G / EtherCAT / PoE ports.

Wi-Fi 7 doubles the air interface but shifts the stress onto the wired uplink port. This article dissects the SI/EMC of 2.5G/5G/10GBASE-T multi-gig links and the 802.3bt PoE++ bias-power challenge, with a one-stop VOOHU selection guide covering LAN transformers, SYT integrated RJ45, PoE power transformers and common-mode chokes.

Why does Automotive Ethernet replace the LAN transformer with a common-mode choke? VOOHU explains the single-pair PHY and CISPR 25 EMC, the four CMC selection criteria for 100BASE-T1/1000BASE-T1, plus a WHAC3225B/WHLC2012A selection table and port protection.

For 1000V/1500V high-voltage energy storage systems, this article analyzes the design pain points of BMS daisy-chain isolated comFor 1000V/1500V high-voltage energy storage systems, this article analyzes the design pain points of BMS daisy-chain isolated communication and isolated power, with a practical VOOHU selection guide using isolation, push-pull and planar transformers.munication and isolated power, with a practical VOOHU selection guide using isolation, push-pull and planar transformers.

From the physical layer, this article unpacks the root causes of Ethernet-port compliance, EMI and PoE failures — detailing OCL, return loss, CMRR and PoE center-tap bias in discrete LAN transformers, plus VOOHU full-rate (10/100–18G BASE-T) selection guidance and a selection table.