Notas de aplicação, guias de solução de problemas e artigos técnicos da equipe RULE.
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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →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.…
Ler o artigo →Selection order for CCTV PoE switches: port count, PoE budget with headroom, uplink sizing, standards, and the site checks that prevent callbacks.…
Ler o artigo →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.…
Ler o artigo →When a managed switch earns its price on a CCTV site: VLAN separation, loop protection, per-port PoE control and remote diagnostics, compared honestly.…
Ler o artigo →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.…
Ler o artigo →Temperature range, DIN rail mounting, wide DC input, redundant power and surge tolerance — when an industrial switch is necessary and when it is overkill.…
Ler o artigo →Beyond the 100 m copper limit: comparing fibre with media converters, PoE extenders and wireless backhaul for long CCTV camera runs.…
Ler o artigo →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.…
Ler o artigo →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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