Industry News
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Why Two 1 Gb/s LACP Links Do Not Make One 2 Gb/s Transfer
Two Gigabit links are active in the aggregation group, but a single file transfer still stays below one Gigabit per second. The second link is mostly quiet. That result can be entirely consistent with the design. In a conventional flow-based link aggregation arrangement, the device selects a mem...Read more -
One Extra Ethernet Cable Can Stop a Network: A Practical Loop-Prevention Review
A technician adds a spare cable between two cabinets to improve reliability. Minutes later, unrelated devices become unreachable and switch activity indicators appear continuously busy. The new cable may have created a Layer 2 loop rather than a usable backup path. Ethernet redundancy needs an a...Read more -
VLAN Works Locally but Fails Across the Uplink: Check Tags in Both Directions
Two devices communicate when connected to the same switch. Move one to the next cabinet and communication fails, even though the uplink is up and both switch menus show the VLAN number. The missing detail is often how frames enter and leave that uplink. A VLAN existing in a configuration is not ...Read more -
BiDi SFP Pairing: Match Both Wavelength Directions Before Ordering
A single-fiber link stops working after one SFP is replaced. The replacement has the same speed, the same advertised distance and the same connector. The missing detail may be the direction of its wavelengths. BiDi transceivers send and receive over one fiber by using a compatible wavelength arr...Read more -
IGMP Snooping Is Enabled—Why Is Multicast Video Still Flooding?
The switch's IGMP snooping checkbox is enabled, but camera traffic still appears on ports with no viewers. Another installation has the opposite symptom: video starts correctly and disappears several minutes later. Neither fault can be resolved reliably by checking the same box again. IGMP ...Read more -
Fiber Link Budget Calculation: Why a 10 km SFP May Not Fit a 6 km Route
The route is six kilometres long. The proposed SFP is described as a ten-kilometre module. That sounds like four kilometres of spare capacity, but distance is not an optical power margin. The receiver must obtain a signal within its specified operating range after the complete path has introduce...Read more -
Ethernet Ring Recovery Time: Test the Application After the Link Fails
A ring restores its alternate path quickly, yet the operator still sees a process alarm or a gap in recorded data. Both observations can be true. Network reconvergence and useful application recovery are measured at different boundaries. A published recovery figure is meaningful only with its to...Read more -
Is an IP40 Industrial Switch Suitable for Outdoors? Review the Complete Enclosure
“Industrial” can describe a switch's mounting, electrical features or operating-temperature capability. It does not automatically mean the device can be mounted in rain. For an IP40 switch, the outdoor installation question begins with the surrounding enclosure and the completed cable entri...Read more -
Industrial Media Converter or SFP Switch? Choose Around the Remote Site
One remote Ethernet device needs a fiber connection. A media converter looks sufficient. Six months later, the same cabinet needs two cameras, a controller and remote fault diagnosis. The original choice now affects power, port availability and maintenance access. The decision between an industr...Read more -
Industrial Switch Temperature Ratings: Find the Limit Inside the Cabinet
An industrial switch is rated for a wide ambient range. The selected optical module has a narrower limit, and the power supply begins reducing its available output before the switch reaches its upper rating. Which temperature describes the cabinet? None of those figures alone does. The completed...Read more -
Dual DC Inputs on an Industrial Switch: How to Prove the Power Is Redundant
Two DC input connectors are visible on the switch. Two supplies are listed in the bill of materials. The project drawing is marked “redundant power.” Before accepting that claim, ask what remains running when one defined component fails. Redundancy is a property of the complete arrangement. It d...Read more -
Extended PoE at 250 Metres: Check Speed, Power and the Actual Camera Stream
A remote camera is 220 metres from the equipment room, and the quotation offers a switch with a 250-metre PoE mode. The distance appears to fit. The remaining questions are whether that mode carries the required traffic and whether the camera receives sufficient power over the installed channel....Read more
