Hanwha HRX-1635 vs Vivotek ND9425P: Specification Comparison
The Hanwha HRX-1635 and Vivotek ND9425P are both 16-channel recorders targeting the SMB and mid-market surveillance segment. However, they represent fundamentally different recorder architectures: the HRX-1635 is a Pentabrid DVR supporting analog coaxial cameras (AHD, HDTVI, HDCVI, NTSC/PAL) plus up to 18 IP channels, while the ND9425P is a pure IP NVR with integrated PoE+ switching. Buyers cross-shopping these units are typically evaluating whether to retain legacy analog infrastructure or migrate fully to IP, making the comparison architecturally meaningful despite the technology divergence.
In This Guide
- How do channel capacity, recording throughput, and storage scalability compare?
- How do camera connectivity, PoE power delivery, and I/O compare?
- How do IP camera protocol support, cybersecurity features, and management software compare?
- Which should you choose: the HRX-1635 or the ND9425P?
- Side-by-Side Specs
- FAQ
How do channel capacity, recording throughput, and storage scalability compare?
The HRX-1635 supports 16 native analog channels (BNC, 1Vp-p, 75Ω) accepting AHD, HDTVI, HDCVI, and NTSC/PAL signals, with an additional 2 native IP channels expandable to 18 total IP channels — giving a hybrid maximum of up to 34 logical inputs, though the recording bandwidth is capped at 128 Mbps. Analog record rates are specified as 8MP@8fps, 5MP@12fps, 4MP@15fps, and 2MP@30fps. Simultaneous playback is rated at 18CH local, 18CH CMS, 4CH mobile, and 1CH web, with a playback bandwidth ceiling of 32 Mbps.
The ND9425P is a dedicated 16-channel IP NVR with no analog input capability. Its recording throughput is specified at 64 Mbps, with a total network input/output throughput of 88 Mbps. Decoding capability is specified at 3840×2160@30fps for a single channel or 1920×1080@120fps across four channels simultaneously, backed by hardware decoding acceleration. Playback is limited to 4 channels simultaneously per the spec.
On storage, the HRX-1635 provides 8 SATA HDD slots supporting drives up to 6TB each, for a maximum raw capacity of 48TB. The ND9425P offers only 2 internal HDD bays (3.5-inch) with RAID 0 and RAID 1 support; maximum HDD capacity is not explicitly stated in the provided specs (Vivotek references a recommended HDD list on their website). The HRX-1635 has a clear advantage in raw storage scalability; the ND9425P's RAID support provides redundancy the HRX-1635 does not specify.
How do camera connectivity, PoE power delivery, and I/O compare?
The HRX-1635 connects analog cameras via 16 BNC inputs with coaxial control (CVBS/Pelco-C, AHD, CVI, TVI). Its network interface is a single RJ-45 Gigabit (10/100/1000BASE-T) port with a transmission bandwidth of 100 Mbps. It provides 16 analog audio inputs (RCA, Line) and 1 audio output (RCA, Line), plus RS-485/422 for PTZ serial control. Alarm connectivity is 16 inputs and 4 output relays — the highest alarm I/O count in this comparison.
The ND9425P is designed as an IP-only NVR with integrated PoE+ switching for camera power delivery, eliminating separate PoE switches or injectors for connected IP cameras. Its Ethernet interface is a single 10/100/1000 Mbps RJ-45 port. Audio I/O is a single 3.5mm jack (1 in / 1 out), significantly less than the HRX-1635's 16-channel analog audio matrix. Alarm I/O is 4 inputs and 1 output — considerably fewer than the HRX-1635.
For RS-485/422 serial PTZ control, the HRX-1635 specifies Samsung-T, Pelco-D, and Pelco-P protocol support, relevant for legacy PTZ domes. The ND9425P does not specify serial PTZ ports; PTZ control is conducted over IP. Both units provide dual USB ports (one front, one rear), with the front port being USB 3.0 on the ND9425P and USB 2.0 on the HRX-1635, reversed at rear.
How do IP camera protocol support, cybersecurity features, and management software compare?
The HRX-1635 supports ONVIF Profile-S and Hanwha's proprietary SUNAPI (Wisenet) protocol for IP camera integration. Supported network protocols include TCP/IP, UDP/IP, RTP, RTSP, NTP, HTTP, DHCP, PPPoE, SMTP, ICMP, IGMP, ARP, DNS, DDNS (Wisenet DDNS), uPnP, HTTPS, and SNMP. Security features include IP address filtering, user access logging, 802.1x authentication, encryption of ID/PW, recording, transmission, and backup, plus a Hanwha Techwin Root CA device certificate. Maximum concurrent remote users are 10 live unicast, 20 multicast, and 3 search sessions. Management software includes Webviewer, SmartViewer, and Wisenet Mobile Viewer (iOS/Android).
The ND9425P supports ONVIF Profile S for third-party IP camera integration. Its protocol stack covers IPv4, IPv6, TCP/IP, HTTP, HTTPS, UPnP, RTSP/RTP/RTCP, SMTP, FTP, DHCP, NTP, DNS, DDNS, and IP Filter. The ND9425P specifies Trend Micro IoT Security integration and a dedicated Cybersecurity Management feature — neither of which appears in the HRX-1635 spec sheet. It also lists Smart VCA event support (including VCA Counting, VCA Event Search, and Crowd Control Solution), which the HRX-1635 does not specify. Management is via Vivotek's Shepherd and VAST 2 software, iViewer mobile app (Android/iOS), and VIVOCloud remote access.
Both units support motion detection, tampering detection, camera disconnection events, FTP and email event actions, and PTZ preset triggering. The ND9425P additionally specifies PIR detection, Camera DI/DO, PoE error events, and Smart VCA events. The HRX-1635 specifies defocus detection and SUNAPI Command as event actions, not listed in the ND9425P specs. Both units support English, French, German, Italian, and Spanish among their language options. The ND9425P additionally lists Czech; the HRX-1635 lists KC and UKCA certifications not present on the ND9425P, while the ND9425P lists VCCI, C-Tick, CB, BSMI, and BIS certifications not listed on the HRX-1635.
Which should you choose: the HRX-1635 or the ND9425P?
Our take: The HRX-1635 is the stronger choice when an existing analog camera infrastructure must be retained or a hybrid analog-plus-IP deployment is required. Its 16 native coaxial inputs supporting AHD, HDTVI, HDCVI, and NTSC/PAL signals — combined with up to 18 concurrent IP channels — allow incremental IP migration without forklift replacement. Storage scalability is a clear HRX-1635 advantage: 8 SATA bays at up to 6TB each yield a 48TB raw maximum versus the ND9425P's 2-bay ceiling. Alarm I/O also favors the HRX-1635 with 16 inputs and 4 relay outputs versus 4 inputs and 1 output on the ND9425P. Conversely, the ND9425P is the correct choice for greenfield all-IP deployments: integrated PoE+ eliminates a separate switch, hardware H.265 decoding supports 4K@30fps per channel, RAID 0/1 provides disk redundancy the HRX-1635 does not specify, and Trend Micro IoT Security plus Smart VCA analytics represent a more current cybersecurity and intelligence posture. Choose the HRX-1635 for hybrid or analog-retention projects; choose the ND9425P for IP-native installations where camera power simplicity and storage redundancy outweigh channel count and storage volume.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | Hanwha HRX-1635 | Vivotek ND9425P |
|---|---|---|
| Product Type | Pentabrid DVR (Analog + IP Hybrid) | IP NVR |
| Analog Camera Inputs | 16CH BNC (AHD, HDTVI, HDCVI, NTSC/PAL) | — |
| IP Camera Channels | 2CH native (expandable to 18CH) | 16CH |
| PoE Output | — | PoE+ (integrated) |
| Max Recording Bandwidth | 128 Mbps | 64 Mbps |
| Network Throughput (In/Out) | 100 Mbps transmission | 88 Mbps total |
| Max Decoding Resolution | 8MP / 4K (display output) | 3840×2160 (4K) @ 30fps (hardware) |
| HDD Bays | 8x SATA | 2x internal (3.5") |
| Max Raw Storage | 48TB (8x 6TB) | Not specified in provided specs |
| RAID Support | — | RAID 0, 1 |
| Alarm Inputs / Outputs | 16 in / 4 out relays | 4 in / 1 out |
| Audio Inputs / Outputs | 16x RCA Line In / 1x RCA Line Out | 1x 3.5mm jack (1 in / 1 out) |
| Video Outputs | 1x HDMI, 1x VGA, 1x BNC Spot Out | 1x HDMI, 1x VGA |
| Compression | H.265, H.264, MJPEG | H.265, H.264, MJPEG |
| ONVIF Support | Profile S | Profile S |
| Cybersecurity Features | 802.1x, IP filtering, encryption, device certificate | Trend Micro IoT Security, Cybersecurity Management, IP Filter |
| Max Power Draw | 200W (with 8x 6TB HDD) | 255W |
| Operating Temperature | 0°C to +40°C | 0°C to +40°C |
| Dimensions (WxDxH mm) | 440 x 384.8 x 88 | 366 x 320.3 x 46 |
| Weight | 7.70 kg (with 1x 4TB HDD) | 2.5 kg (without HDD) |
| Certifications | UL, CE, FCC, KC, UKCA | CE, FCC, VCCI, C-Tick, UL, CB, BSMI, BIS |
Frequently Asked Questions
Which should you choose: the HRX-1635 or the ND9425P?
The HRX-1635 is the stronger choice when an existing analog camera infrastructure must be retained or a hybrid analog-plus-IP deployment is required. Its 16 native coaxial inputs supporting AHD, HDTVI, HDCVI, and NTSC/PAL signals — combined with up to 18 concurrent IP channels — allow incremental IP migration without forklift replacement. Storage scalability is a clear HRX-1635 advantage: 8 SATA bays at up to 6TB each yield a 48TB raw maximum versus the ND9425P's 2-bay ceiling. Alarm I/O also favors the HRX-1635 with 16 inputs and 4 relay outputs versus 4 inputs and 1 output on the ND9425P. Conversely, the ND9425P is the correct choice for greenfield all-IP deployments: integrated PoE+ eliminates a separate switch, hardware H.265 decoding supports 4K@30fps per channel, RAID 0/1 provides disk redundancy the HRX-1635 does not specify, and Trend Micro IoT Security plus Smart VCA analytics represent a more current cybersecurity and intelligence posture. Choose the HRX-1635 for hybrid or analog-retention projects; choose the ND9425P for IP-native installations where camera power simplicity and storage redundancy outweigh channel count and storage volume.
Can the HRX-1635 or ND9425P power IP cameras directly without a separate PoE switch?
Only the ND9425P includes integrated PoE+ for directly powering IP cameras. The HRX-1635 spec sheet does not list any PoE output capability; IP cameras connected to the HRX-1635 would require a separate PoE switch or injector.
Which unit supports more storage, and does either offer RAID redundancy?
The HRX-1635 supports up to 8 SATA HDDs at up to 6TB each, for a stated maximum of 48TB raw capacity. The ND9425P has 2 internal HDD bays; its maximum capacity is not explicitly stated in the provided spec sheet. The ND9425P specifies RAID 0 and RAID 1 support; the HRX-1635 does not specify RAID. For maximum raw storage volume, the HRX-1635 has a clear spec advantage; for disk redundancy, the ND9425P is the only specified option.
Is the HRX-1635 or ND9425P better suited for a site that already has analog cameras installed?
The HRX-1635 is purpose-built for this scenario. It accepts 16 coaxial analog inputs supporting AHD, HDTVI, HDCVI, and NTSC/PAL signal types, while simultaneously supporting up to 18 IP cameras via network, allowing a phased migration. The ND9425P is a pure IP NVR with no analog inputs specified; it cannot directly connect or record from coaxial analog cameras.
Get a Second Opinion on Your Camera Choice
Share your site layout, coverage goals, and budget. Our team will validate the camera selection, flag anything we would change, and recommend products that match the use case.