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Beryllium NVRs

32 Channel 2 HDD 1U 4K NVR

Model KN-3221B

The KN-3221B network video recorder from the practical Beryllium series lets you manage a large number of IP cameras on an efficient dual-drive system.

  • NO.of Channels 32CH
  • NO.of HDDS 2HDD
  • Smart Code CODEC

Overview

The KN-3221B network video recorder from the practical Beryllium series lets you manage a large number of IP cameras on an efficient dual-drive system. With support for 32 video channels, it is an exceptionally cost-effective solution for large residential buildings and commercial complexes that need a high camera count but where very long-term archiving is not the top priority. Powerful processing, compatibility with integrated surveillance software and support for smart video content analytics (VCA) make it a highly reliable, flexible and practical tool for everyday surveillance.

Technical specifications

Datasheet (PDF)

Model: KN-3221B

CPU & GPU Capabilities

CPU
Quad-Core ARM Cortex
IP Channel Input
(Up to 12 MP Supported) 32CH x 4K@30fps

Recording

Video Resolution
1080P, 12MP, 2CIF, 3MP, 4CIF, 4MP, 5MP, 720P, 8MP, CIF, DCIF, QCIF, VGA
Input Bandwidth
256 Mbps
Record Mode
Alarm, Event, Manual, Schedule, Smart Event
Pre & Post Record
Post 10~300 sec, Pre 1~30 sec

General

Web Viewer
IE
Power Supply
200~240V AC, 50~60Hz
Working Environment
-20°C ~ +65°C / 10% ~ 90% RH (Non condensing)
Rackmount
Yes 1 Unit
Dimension (W×D×H)
376*277*45 mm
Weight
2.1 Kg Without HDD

Hard Disk

HDD
2 SATA
Capacity
Up To 14 TB For Each HDD
RAID Support
Mirror
Group HDD
Yes

Interfaces

Network
1 x RJ45(10/100/1000Mbps)+LED Indicator

External Interface

4G Dongle / Wifi
Supported
USB Interface
Front Panel: 1 × USB 2.0 Rear Panel: 1 × USB 3.0
eSATA
N/A
Alarm In / Alarm Out
8 / 1
Controller
N/A

Smart Function

Intelligent Functions
Area Intrusion Audio Exception Audio Exception Detection Blurred Detection Car Shape Detection Face Detection Fast Moving Human Detection Line Crossing Loitering Detection Motion Detection Object Missing Parking Detection People Counting People Gathering Detection Region Entrance Region Exiting Scene Change Detection Unattended Objects Video Shelter

Video/Audio

HDMI Output
1CH x 4K (3840 × 2160)
VGA Output
1CH x Full HD (1920 × 1080)
Audio Input/ Output
1CH Input, 1CH Output
Video Compression
H.264+(Ultra H.264) H.265+ (Ultra H.265) Smart Event Codec
Audio Compression
G.711a, G.711u

Playback & Backup

Sync Playback
16CH (Up to 4K@30fps)
Search Mode
Alarm Input, All Smart Function, Motion, Time & Date
Playback Mode
ANR Support, Event, Label, Normal, Picture Playback, Smart Playback, Time Division
Backup Mode
Network, USB Device

Network & Monitoring

Protocols
DDNS, DHCP, FTP, HTTP, HTTPS, ICMP, Multi Cast, NAT, NTP, P2P, RTSP, SNMP, TCP/IP V4, TCP/IP V6, UDP, UPnP
Compatibility
API CGI ONVIF (Profile S, G, T) SDK
Output Bandwidth
256 Mbps
User
32 Users
Streaming Method
Multicast, Unicast
Windows Software
Unlimited KDT CMS /VMS 128CH Per Monitor
Smart Device
Android Phone, Android Tablet, iOS

Guarantee

Power Consumption
≤10 W Without Hard Disk
Product Guarantee
3 Years Platinum Guarantee
MTBF
100,000 hrs min. MIL-HDBK-217F (25°)

Downloads

Documentation

  • KN-3221B

    DatasheetPDF518.7 KB

Software and firmware

  • 4011

    Version 11-V500.XXXX.R00X.4011UPF29.12 MBUpdated July 2, 2026

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Frequently asked questions: Network Storage

Answers to common questions about this product line, from the KDT Help Center.

Where should I start when choosing the right network storage?

Start by defining the intended use, the number of devices, the installation environment, the capacity required and your plans for future expansion. Then choose the model and technical specifications based on what the project actually needs.

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Which technical specifications matter most for network storage?

Depending on the project, the most important specifications are capacity, speed, compatibility, environmental ratings, management features and scalability. Basing your choice on a single figure is usually not enough.

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Is a cheaper network storage model always the right choice?

No. The purchase price is only one factor. You also need to consider reliability, features, service life, after-sales service and maintenance costs.

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How do I work out how much capacity a network storage system needs?

Base the calculation on the number of devices, actual usage, how long the system will be in use and how much the project is likely to grow. It is also wise to keep some capacity in reserve.

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Can network storage be upgraded later?

In many cases, some of the capacity or equipment can be upgraded. However, this depends on the product's architecture and its hardware limitations, so check before you buy.

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Warranty

3-Year Platinum Warranty

This product comes with the official KDT warranty. Check your device’s warranty status with its serial number.

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