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Description
Dahua DHI-ARC3800H-FW2(868) AirShield 4G Draadloze Alarmhub 2Productbeschrijving Dahua DHI ARC3800H FW2 is een draadloze alarmhub die geschikt is om de veiligheid van uw faciliteit te garanderen. Het ondersteunt maximaal 150 draadloze apparaten, waaronder 6 sirenes, 64 PIR camera's, 64 sleutelhangers, 8 toetsenborden en 4 repeaters, waardoor u uw beveiligingssysteem flexibel kunt aanpassen aan uw behoeften. Het apparaat is uitgerust met een 8 kanaals IPC video ingang, die is ontworpen om alarmen te downloaden,
Productbeschrijving
Dahua DHI-ARC3800H-FW2 is een draadloze alarmhub die geschikt is om de veiligheid van uw faciliteit te garanderen. Het ondersteunt maximaal 150 draadloze apparaten, waaronder 6 sirenes, 64 PIR-camera's, 64 sleutelhangers, 8 toetsenborden en 4 repeaters, waardoor u uw beveiligingssysteem flexibel kunt aanpassen aan uw behoeften.
Het apparaat is uitgerust met een 8-kanaals IPC-video-ingang, die is ontworpen om alarmen te downloaden, zodat er tijdig op eventuele incidenten kan worden gereageerd. Meldingen via sms, telefoontjes en video zijn ook inbegrepen, en een offline cache zorgt voor extra betrouwbaarheid.
De hub ondersteunt Wi-Fi 2.4G voor draadloze verbinding en heeft één RJ-45 Ethernet-poort (10/100 Mbps) voor bekabelde verbinding. Om de betrouwbaarheid en redundantie van de communicatie te vergroten, ondersteunt het apparaat de installatie van twee simkaarten.
Specificaties
| Draadloze zone | 150 kanalen draadloze randapparatuur (6 sirenes, 64 PIR-camera's (alleen 8 PIR-camera's voor binnen), 64 sleutelhangers, 8 toetsenborden en 4 repeaters) |
| Netwerkmodus | Ethernet, Wi-Fi en mobiel netwerk (ondersteunt de installatie van dubbele SIM-kaarten. Er kan slechts één kaart tegelijk worden ingeschakeld) |
| Netwerkpoort | 1 RJ-45, 10 Mbps/100 Mbps Ethernet-poort. |
| Opslagbatterij | Eén ingebouwde oplaadbare lithiumbatterij van 4.750 mAh. |
| Video-ingang | 8-kanaals IPC, die alleen het uploaden van alarmvideo's ondersteunt. |
| Audio-uitvoer | 1 kanaal |
| Volumeregeling | Ja |
| Stemuitzending | Telefoon en lokale spreker |
| Indicatielampje | De indicator geeft de status van alarmen, in en uitschakelen, de netwerkverbinding en apparaatstoringen aan. |
| Knop | Bevat een resetknop, spanningsknop en AP-schakelknop. |
| SMS | Ja (tot 5 telefoonnummers) |
| Telefoongesprek | Ja (tot 5 telefoonnummers) |
| Videoverbinding | Ja |
| Offline-cache | Slaat maximaal 50 alarmmeldingen op. |
| Bewapenen en ontwapenen | App, toetsenbord, afstandsbediening, kaart, gepland in- en uitschakelen. |
| Op afstand updaten | Cloud-update |
| Detectie van een lege batterij | Ja |
| Sabotage |
Ja |
| Gebruikersbeheer | 33 app-gebruikers (31 algemene gebruikers, 1 beheerder en 1 installateur) en 32 toetsenbordgebruikers |
| Logboeken | Tot 5.000 vermeldingen |
| Transmissieprotocol | SIA, SoftGuard |
| Carrier Frequency | 868,0–868,6 MHz |
| Zendervermogen (EIRP) | Limiet 25 mW |
| Communicatiemechanisme | Tweerichtingsverkeer |
| Communicatie afstand | Tot 2.000 m (6.561,68 ft) in een open ruimte. |
| Encryptiemodus | AES128 |
| Frequentieverspringing | Ja |
| Taal | Er worden maximaal 7 talen ondersteund voor SMS: Engels, Spaans (Latijns-Amerika), Frans, Italiaans, Arabisch, Turks en Deens. Standaard is Engels ingesteld. De alarmspraakberichtfunctie en lokale spreker ondersteunen alleen Engels. |
| Stroomvoorziening | 100–240 V wisselstroom, 50/60 Hz |
| Standby-tijd | De batterij gaat tot 12 uur mee als deze volledig is opgeladen en voldoet aan de volgende voorwaarden: Er is verbinding met wifi, de ID is gekoppeld aan de alarmcentrale, het hartslaginterval is 1800 seconden en er is verbinding met 8 randapparaten en de cloud. |
| Stroomverbruik | ≤12W |
| Bedrijfstemperatuur | Wanneer de batterij niet wordt opgeladen: –10 °C tot +55 °C (+14 °F) tot +131 °F) Als de batterij wordt opgeladen: 0 °C tot +45 °C (+32 °F tot +113 °F) |
| Bedrijfsvochtigheid | 10%–90% (RV) |
| Productafmetingen | 174,8 mm × 174,8 mm × 38,3 mm (6,88” × 6,88” × 1,51”) (L × B × H |
| Netto gewicht | 510 gram (1,12 pond) |
| Brutogewicht | 860 gram (1,90 pond) |
| Installatie | Geschikt voor wand- en bureaubladmontage. |
| Behuizingsmateriaal | PC + ABS |
| Certificeringen | CE |
| Corrosiewerend niveau | Basisbescherming |
| Opslagtemperatuur | –10 °C tot +55 °C (+14 °F tot +131 °F) |
| Opslagvochtigheid | 10%–90% (RV) |
| Verpakkingsafmetingen | 254 mm × 211 mm × 61 mm (10,00” × 8,31” × 2,40”) (L × B × H), vrijstaand in de binnendoos 524 mm × 508 mm × 442 mm (20,63” × 20,00” × 17,40“) (L × B × H), beschermhoes |
| Wi-Fi-standaard | IEEE 802.11b/g/n |
| Wi-Fi-frequentiebereik | 2400-2483,5 MHz |
| Wi-Fi-stroomoverdracht | ≤20 dBm bij 2400-2483,5 MHz |
| Zendervermogen (EIRP) | 4G: Vermogensklasse 3: 23 dBm±2dB 3G: Vermogensklasse 3: 24 dBm+1/-3dB 2G: Vermogensklasse 0: 30 dBm±3dB (GSM900) Vermogensklasse 5: 33 dBm±3dB (GSM1800) |
| Standaard voor mobiel netwerk | GSM/WCDMA/LTE |
| Frequentiebereik | RU: 4G: FDD-LTE: B1/B3/B7/B8/B20/B28; TDD-LTE: B38/B40/B41; 3G: WCDMA: B1/B5/B8; 2G： GSM: 1.800/900 MHz;₩EU: 4G: FDD-LTE: B1/B3/B7/B8/B20/B28A; TDD-LTE: B38/B40/B41; 3G: WCDMA: B1/B8; 2G： GSM-frequentie: 1.800/900 MHz; |
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4.8 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
Skip the introductions and go right to the narrative
Let's face it. Most of the history I read is written by white people. Some things need to be read in the "first person" and this is one of them. Not only is it a landmark book (not just for it's time but for all time), it is still easy to read, believable, compassionate to all (including slave owners) and completely gripping. It is not too brutally descriptive to be disturbing to any older kids or teens I know, and it is a patient, instructive and compelling story that I believe could still be a powerful, memorable and life changing read for anyone.
Personal Note:
I went to Maryland public schools in the 70's and early 80's. This was not on my required reading list. I wish it had been, but then maybe I would have hated it. The story of Frederick Douglas is to me overwhelming. The indictment of Southern Christianity is also particularly grievous. I do feel like I'm beginning to get a sense of the longtime North - South cultural divide as a matter of regional . . . religious . . . and economic ... pride.
Misc Notes:
1. Brer Rabbit - in the intro to my book - Robert O'Meally mentions Brer Rabbit and Disney's now banned (and well censored) in the USA "Song Of The South" movie (think "Zip-A-De-Do-Da") - I don't have any wisdom on this but Brer Rabbit is a vaguely forbidden character in our country, as is Bugs Bunny, who the writer indentifies as a modern day Brer Rabbit. I always liked Bugs Bunny, but you don't see these cartoons around. I have an older African American friend who asked me if I could find a copy of "Song of the South" which he had fond memories of watching in the movie theater as a kid. Well I couldn't . . .
2. In my appendix, there is mention of pro slavery arguements of the 1840's. One is to the effect of "Slavery itself doesn't hurt slaves . . . its the abuse of slavery by slaveholders that hurts slaves." Hmmm, that sounds familiar . . .
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Reviewed in the United States on November 6, 2013
★★★★★ 5
An essential American autobiography
As the title implies, this short work is the narrative of Frederick Douglass, an escaped slave. He wrote it by himself, a significant fact in that his prose is so eloquent and his pathos so powerful that it seems impossible for a former slave to have composed it. In this short autobiography, Douglass recounts his life as a slave, and details some of the horrors and atrocities perpetuated on slaves by their fiendish overseers, most of whom Douglass portrays as downright evil. More than just a narrative of his life, Douglass also gives an account of how the desire to be free grew and began to burn within his bosom, and how he grew to hate that horrible institution. Above all, this is a story of a slave learning that he is, in fact, a human being.
The significance of this book cannot be overestimated. In it, Douglass effectively dispels a number of popular myths about slaves and slaveholders, and forever changes the way the reader (especially one who lived while slavery still existed) looks at slavery. The theme of this book is very simple: slavery is wrong. It is evil, it is cruel, and, despite what many people thought at the time, the slaves know how cruel it is. Douglass cites several examples of the horrible treatment slaves received, one of them being separation of families. "It is a common custom...to part children from their mothers at a very early age" So it was with Douglass and his own mother.
Douglass writes in a very eloquent style, and this contributes to the power of this work. Many people who thought blacks were inferior in intelligence were shown to be sadly mistaken with the coming of Frederick Douglass, a man both educated and refined. It may be said that the book is not entirely fair, for it is decidedly anti-slavery, but it is undoubtedly true for most cases nonetheless. Most of the overseers in Douglass's narrative are demonic and sadistic, but when a good overseer comes along (such as Freeland), he is fair in his treatment of him.
One can imagine the fuel this book gave to the abolitionist fire, and it is not difficult to see why Douglass had such an impact on both North and South. This is, in my opinion, a definitive work, in that it shows the horrible institution of slavery in all its barbaric nature, and does it from a firsthand point of view, that of a former slave. This book was a tremendous contribution, both for the light it shed on slavery in general, and for proving that blacks were not intellectually inferior by nature, but instead were "transformed into...brute[s]" at the hands of their overseers.
This is a great book, essential for anyone wanting to study the Civil War era or wanting to gain a firmer understanding of slavery.
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Reviewed in the United States on January 13, 2003
★★★★★ 4
I always feel comfortable and at ease when I go...
Format: Paperback
Good purchase
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Reviewed in the United States on March 28, 2026
★★★★★ 5
This man's ability to describe the various monstrosities encountered throughout his journey in such a beautiful, articulate
I found this book, though historic, to be a modern marvel. I find not only the man himself but even more so the writings of Frederick Douglass to be totally FASCINATING! This man's ability to describe the various monstrosities encountered throughout his journey in such a beautiful, articulate, and eloquent way is utterly GENIUS! In reading this timeless masterpiece I discovered that this man bears the unmatched, undisputed spirit of a champion; the undying essence of a true warrior that I'm sure would resonate to any and every reader who would be so bold as to take a glance at the greatness that lies between the pages of this work of genius. This man's profound desire to acquire knowledge and educate himself by whatever means necessary exudes a ground shaking, bone rattling determination as I have scarcely; if at all, ever heard of. Frederick Douglass is to me the epitome of class and integrity and can serve as a role model and an inspiration to anyone in search of an incentive to better themselves, even or ESPECIALLY in the face of adversity. In this BRILLIANT account of his heroic journey from slavery to freedom he bestows a wisdom; a very keen insight, and he embodies an honor, the likes of which I have never seen in ANY other writer. I HIGHLY recommend this book to ANYBODY who is in search of inspiration or just a GREAT read!
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Reviewed in the United States on February 21, 2015
★★★★★ 5
Simply the best narrative I have read...
As society moves about, the slavery of the past remains alive and well. "Sweep it under the rug and do not bring it up" is the mindset of many. This type of suppression is often brought about because of the known guilt of an unfair past. American slavery has deep roots, reading the life of Fredrick Douglass, will help unveil some of the true history of America.
At one point in the book Douglass realized he had past the time of being an indentured servant and knew that being a slave for life was his fate. He was treated with little if no respect. Douglass described Mr. Severe, one of his "masters", as a man who would whip a slave for almost no reason at all (22). Dougless illustrated that Mr. Severe had no respect for his slaves, but treated them as if they were not human.
Many people may think that Douglass story was the exception, but that's not the case. Many times through out the book Douglass spoke of other slave's punishment as far worse than his own. He even recorded the murder of two slaves in Talbot, Maryland and stated that the slave owner never paid for the crime (31-33). This type of abuse almost seems unfathomable, but it's reality.
Studying the origins of slavery can allow us to see the disgusting progression of the enslavement of human life and stripping of human character. Douglass' narrative provides the reader with a glimpse into the life of a slave. The emotional state of Douglass was strong, considering the abuse that he underwent during his life. The narrative of Fredrick Douglass is a superb read for anyone wanting to get a first hand understanding of the life of an American slave.
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Reviewed in the United States on July 18, 2007