Instruction manual

Instruction manual 17
2.4.4 Devices configuration
Date and time
All the system information is normally based to the operating system date and time.
The DVR and NVR devices also include an internal clock and calendar that help the DVR scheduled tasks to run
according the defined periods, and all the recorded video & events will be marked with this timestamp to let
Nethunter viewers be able to manage/view/search it as appropriate.
During system setup and before start recording video, check and configure the correct date and time on all your
devices.
Main configuration parameters
Static IP address for local devices: All the devices connected to Nethunter should be connected with a static IP
address.
Dynamic IP address through DNS resolution: It is possible to configure the Nethunter IP recorder (NVVR) with a
DNS name.
When connecting hardware devices to Nethunter, you have to be sure that each device is configured with a
static IP address. Nethunter is not enabled nor recommended to work with dynamic IP address for local devices.
To configure each device IP address, please, refer to the device setup guide, due to each device might have
different ways to configure.
It is really easy to setup devices into Nethunter, you only need to go to the settings section  devices option
and add a new device, which is recognized by selecting the device model and its IP address.
Network
Nethunter components are connected using the TCP/IP protocol. The network configuration will be setup
according to each business infrastructure and connectivity needs.
Due to security reasons, it is recommended to isolate clients and video capture devices, or recorder devices.
Through Nethunter server working across firewalls, the Nethunter clients’ security restriction will be ensured.
Bandwidth consumption
When building a network configuration for a Nethunter installation there are some things to be considered such
as: Network bandwidth limits, switches, servers, connected clients, amount of cameras…
Any IP camera has some parameters that may affect the output video quality.
The main ones are the network/compression bandwidth, compression algorithm (MPEG-4, H.264...), resolution
(D1, VGA …), frame rate and the GOP size.
The camera video flow is sent through a unique network connection. The camera bandwidth must be fixed in its
webserver. With this premises, it is clear that the camera video quality or compression will be affected by the
network bandwidth.
Each IP surveillance installer may consider the Business requirements to design correctly the network
infrastructure.
The DVR devices specification details the maximum network bandwidth that the device will use on maximum
operation parameters.
For a NVR device you should also check the network maximum parameters.
Finally the Nethunter components network consumption depends on:
NVVR: Depends on the amount of connected cameras (∑ bandwidth) and also depends on the amount of servers
connected and the quantity of simultaneous live or playback video requests.
In the case of having 2 servers with 5 clients each one displaying a maximum of 9 cameras each one, the
bandwidth will be:
NVVR output bandwidth = Camera bandwidth * 9 * 5 * 2
NVVR input bandwidth = Camera bandwidth * Amount of IP cameras
NVVR total bandwidth = NVVR output bandwidth + NVVR input bandwidth
It is possible to distribute some NVVR across you network, and also connecting multiple Nethunter servers to
your NVVR.