Press Releases
2026-07-13
Detailed explanation of VOOHU: PoE switch (PSE side) multi-port network port design - multi-port integrated magnetic RJ45, network transformer bias and port crosstalk/heat dissipation pit avoidance
The PSE port of the PoE switch is not a simple copy and paste of the network port. This article dismantles the design points of the PSE side from five dimensions: network transformer DC bias, multi-port integrated magnetic RJ45 and discrete network transformers, inter-port crosstalk and Bob Smith termination, three-level surge protection and thermal design, and provides a VOOHU on-rack material number selection table.
2026-07-10
【FAQ】 Audio Isolation Transformer: Signal Goes In But Won't Come Out? – VOOHU WHTT4005 Primary-Secondary Isolation Test Full Analysis
In professional audio, broadcast communications, and industrial instrumentation systems, ground loop hum, common‑mode interference, and abnormal voltage coupling are three common signal‑chain problems. In mild cases, they raise the noise floor and degrade
2026-07-10
VOOHU WH81177C00021 Replaces Molex 2027180100 — QSFP-DD High-Speed Connector Comparison
VOOHU WH81177C00021 replaces the discontinued Molex 2027180100 — a QSFP-DD 76-circuit, right-angle surface-mount high-speed connector, with a side-by-side parameter comparison.
2026-07-10
VOOHU Deep Dive: Galvanic Isolation and Common-Mode Noise Suppression for Gigabit Ethernet Ports on Industrial Gateways and PLCs
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.
2026-07-09
VOOHU WH290Z019D0S01 Replaces Molex 74441-0001 — SFP+ Connector Comparison
VOOHU WH290Z019D0S01 is a drop-in replacement for Molex 74441-0001: an SFP+ 20-position, 0.80 mm-pitch board connector with identical A/B/C/D dimensions and PCB layout, enabling a pin-and-footprint swap. Key parameters compared side by side.
2026-07-09
VOOHU Field Guide: Selecting 10/100BASE-TX Ethernet LAN Transformers and ESD / Surge Protection
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.
2026-07-08
VOOHU Selection Guide: LAN-Transformer Selection, Cost-Down and EMC Pitfall-Avoidance for Home & Consumer Router/Switch Ports
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
2026-07-08
SFP Cage: VOOHU WH81-111-Y0002-1 as a Replacement for Pulse SFPCAGE002-L
Competitor Product Overview (Pulse Electronics (a YAGEO company))
Pulse Electronics (a YAGEO company) is a well-known global maker of magnetics and connectors, spanning LAN transformers, PoE magnetics, antennas and interconnects such as SFP cages. The SFP
2026-07-07
VOOHU Field Guide: Troubleshooting Gigabit Ethernet Ports — Link-Up Failure, Packet Loss and Overheating, with Magnetics Selection
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
2026-07-07
RJ45 Jack Connector : VOOHU WH56A31882021103 as a Replacement for TXGA FRJ45012-1103K6K1200
Competitor Product Overview (TXGA (TXGA Industrial Electronic Co., Ltd.))
TXGA (TXGA Industrial Electronic Co., Ltd., Shenzhen) is a connector and cable-assembly manufacturer whose product range covers RJ45 network connectors, M16 circular connectors, wir
2026-07-07
RJ45 RJ45 Offset Connector: VOOHU SYT-CB4.2YGZNL as a Replacement for TXGA FRJ45041-1301K6K1100
Competitor Product Overview (TXGA (TXGA Industrial Electronic Co., Ltd.))
TXGA (TXGA Industrial Electronic Co., Ltd., Shenzhen) is a connector and cable-assembly manufacturer whose product range covers RJ45 network connectors, M16 circular connectors, wir
2026-07-06
VOOHU Guide: Designing the PoE RJ45 Port for Security IP Cameras — LAN Transformer, PoE Powering & Surge/ESD Protection
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.
