Прикладные заметки, руководства по устранению неисправностей и технические статьи команды 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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →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.…
Читать статью →Selection order for CCTV PoE switches: port count, PoE budget with headroom, uplink sizing, standards, and the site checks that prevent callbacks.…
Читать статью →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.…
Читать статью →When a managed switch earns its price on a CCTV site: VLAN separation, loop protection, per-port PoE control and remote diagnostics, compared honestly.…
Читать статью →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.…
Читать статью →Temperature range, DIN rail mounting, wide DC input, redundant power and surge tolerance — when an industrial switch is necessary and when it is overkill.…
Читать статью →Beyond the 100 m copper limit: comparing fibre with media converters, PoE extenders and wireless backhaul for long CCTV camera runs.…
Читать статью →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.…
Читать статью →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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