Lesson 1Network versus analogue systems: NVR versus DVR setups and mixed choicesGrasp the distinctions between analogue and IP CCTV, covering DVR, NVR, and hybrid setups. Discover upgrade paths, wiring effects, and decisions on retaining old coax cables or shifting to full network video in Eritrean sites.
Analogue HD over coax cablesIP cameras and NVR setupsHybrid DVR and converter optionsBandwidth and wiring effectsUpgrading from DVR to IPLesson 2Recorders and storage: Sizing NVRs, RAID choices, retention estimates, drive endurance and HDD picksLearn to size NVRs based on channels, data rates, and storage duration. Weigh RAID types, hard drive varieties, and endurance levels, plus compute storage for various resolutions and frame speeds in local conditions.
Data rate estimates per cameraStorage sizing and retention formulasRAID 0,1,5,6,10 pros and consSurveillance HDDs versus regular onesDrive endurance and workload specsLesson 3CCTV camera types (fixed, adjustable, PTZ, dome, bullet) and their applicationsExamine fixed, adjustable-focus, PTZ, dome, and bullet cameras and ideal uses. Understand how shape, surroundings, and threat levels guide choices for deterrence and anti-vandal features in Eritrean environments.
Fixed lens for basic viewsAdjustable lenses for versatile shotsPTZ for dynamic surveillanceDome versus bullet designsVandal-proof and hidden choicesLesson 4Sensor sizes, resolution, frame speeds, and night vision (1/2.8", 2MP, 4MP, 4K, WDR, IR distance)Investigate how sensor size, resolution, and frame speed impact picture clarity and data use. Cover night vision topics like WDR, IR distance, and noise reduction, balancing detail against storage and network constraints locally.
Typical sensor sizes and factors2MP,4MP,4K resolution benefits and drawbacksFrame speed versus blur and storageReal WDR versus digital methodsIR light distance and limitsLesson 5Picking practical models: Reading datasheets, supplier reliability, warranty and support factorsBuild abilities to analyse camera and NVR datasheets, assess true performance, and dodge hype. Evaluate supplier trust, software updates, warranties, and return processes for model selection in Eritrea.
Vital specs impacting real useInterpreting light sensitivity and luxChecking data rates and encoding claimsSupplier software and security recordsWarranty details and return stepsLesson 6Network switches and PoE: Standards (802.3af/at/bt), power budgets, managed versus basic switchesStudy PoE standards, power planning, and switch choices for CCTV networks. Contrast managed and basic switches, port numbers, uplink speeds, and backup options for steady camera links in Eritrean setups.
802.3af,at,bt power tiersPoE power budget computationsPoE switches versus injectorsManaged versus basic switch traitsUplink speeds and overload risksLesson 7Camera features: PoE, ONVIF support, motion sensing, sound, tamper alertsExamine essential camera traits for integration and ease, like PoE, ONVIF, motion sensing, audio, and tamper warnings. Know when each is vital, optional, or unneeded for projects in local contexts.
PoE types and camera power useONVIF profiles and device matchingMotion sensing and intelligent analysisAudio inputs, outputs, and legal notesTamper sensing and response handlingLesson 8Accessory choices: Mounts, enclosures, sun shields, cable fittings, surge guards, and weatherproofing for outdoor gearReview add-ons that safeguard and secure CCTV setups, such as mounts, enclosures, sun shields, fittings, and surge protection. Master weatherproofing for durable outdoor use in Eritrea's climate.
Wall, pole, corner mount optionsOutdoor enclosures and sun shieldsCable fittings and tension reliefSurge guards and earthingWeather seals and protection levelsLesson 9Power supplies and backups for CCTV: DC injectors, central power units, UPS sizing for recorders and network gearExamine power choices for cameras and recorders, including DC units, PoE injectors, and UPS. Size UPS capacity and plan backups to sustain recording through power cuts in unreliable grids.
Central versus local power unitsDC distribution and voltage lossPoE injectors and mid-point designsUPS sizing for NVRs and switchesBackup power and switchover plansLesson 10Lens choices, view angles, and focal length math for coverage zonesUnderstand how focal length, sensor size, and lens kind shape view angles and detail. Practise zone planning, angle picks, and lens calculations for identification, recognition, or broad views in sites.
Fixed versus adjustable lens traitsFocal length, view angle, distance linksSensor size effects on coveragePixels per foot or metre calculationsLens picks for doors and gates
