Application notes, troubleshooting guides and technical articles from the RULE team.
Where surges actually enter an outdoor camera network, what a Type 2 or Type 3 SPD does, how earthing and bonding decide whether protection works at all, and what to write into the BOM.…
Read the article →A disciplined order for diagnosing a camera that will not power up: link state, class negotiation, budget, cable, PD load, port configuration — with the symptom-to-cause table engineers actually use.…
Read the article →How to lay out switches, cabinets and uplinks for a camera network: cameras per switch, bandwidth per resolution, VLAN and IP planning, NVR placement and the uplink sizes that avoid bottlenecks.…
Read the article →Distance, bandwidth, PoE current and environment decide the cable, not habit. What each category actually supports, why CCA cable fails on PoE, and when the answer is fiber instead of copper.…
Read the article →The twelve details that decide a switch quotation — port mix, PoE standard and budget, uplinks, temperature, firmware, certification, packing and delivery. Missing any one of them costs a revision round.…
Read the article →When a single injector is the right answer and when it quietly becomes a liability: cost comparison, failure modes, cabinet space, surge exposure and the retrofit cases where a midspan beats a new switch.…
Read the article →Which lines in an industrial switch datasheet actually matter on site: operating temperature, IP rating reality, DIN rail and power input, EMC and surge class, fanless design and MTBF.…
Read the article →Two ways to move camera traffic beyond copper's 100 m limit: a media converter paired with a copper switch, or a switch with SFP cages. Cost, reliability, management and the cases each one suits.…
Read the article →PoE classes explained for CCTV buyers: what 802.3af, 802.3at and 802.3bt actually deliver at the camera, how PD classes work, and how to avoid over- or under-specifying.…
Read the article →How to pick SFP, SFP+, SFP28 modules and DAC cables for switch uplinks: speed tiers, reach classes, wavelength pairing, coding compatibility and the checks that prevent a link that will not come up.…
Read the article →Practical VLAN design for surveillance networks: separating cameras from office and guest traffic, trunking to the NVR, IGMP for multicast video, QoS and the rules that keep a site manageable.…
Read the article →How ring topologies, RSTP and ERPS keep surveillance networks running when a link or a switch fails — recovery times, design rules, and where redundancy is not worth the cost.…
Read the article →A buyer's checklist for PoE switch datasheets: total PoE budget, per-port class, switching capacity, uplink, VLAN and management features, and thermal rating — the six figures that decide a project.…
Read the article →Selection order for CCTV PoE switches: port count, PoE budget with headroom, uplink sizing, standards, and the site checks that prevent callbacks.…
Read the article →A simple PoE budget method for CCTV: typical camera draws, the headroom rule, cable loss, IR spikes, and how many cameras a switch really powers.…
Read the article →When a managed switch earns its price on a CCTV site: VLAN separation, loop protection, per-port PoE control and remote diagnostics, compared honestly.…
Read the article →Bitrate math for CCTV: when a gigabit uplink is enough, when 2.5G helps, when to jump to 10G, and what cabling each step requires.…
Read the article →Temperature range, DIN rail mounting, wide DC input, redundant power and surge tolerance — when an industrial switch is necessary and when it is overkill.…
Read the article →Beyond the 100 m copper limit: comparing fibre with media converters, PoE extenders and wireless backhaul for long CCTV camera runs.…
Read the article →Six practical rules that decide whether CCTV footage is usable — layout planning, digital recording, lighting and sun angle, camera height, lens cleaning and wired links.…
Read the article →Five switch problems that break CCTV projects — bandwidth bottlenecks, PoE shortfalls, network loops, no remote management, wrong cabling — and the spec that fixes each one.…
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