RADIUS, Remote Authentication Dial-in User Services, is an internet standard protocol supporting integrated 3A(Authentication, Authorization, Accounting) services. RADIUS has the following features.

- When a remote user requests connection to DVR, user ID, password, IP address and other information are sent to a RADIUS server to check the validity.
- Useful when changing passwords regularly and to secure complete security control.
 

What is the advantage when using RADIUS?
- ID and password is managed by RADIUS server, not DVR, to strengthen the security.
- Do not need to connect every DVR to change password.
- RADIUS can update multiple DVR access information at once. So, it is useful when a periodic password change is required.

DVR access method using RADIUS
If RADIUS server is used for DVR login, users’ entered account information (ID & Password) are sent from DVR to RADIUS server. After RADIUS server checks the account validity, it notifies the result to DVR. Because DVR receives the login validity from RADIUS server, strong security can be achieved.

Use of RADIUS
[Fig. 2] shows an example of RADIUS. DVRs placed in each bank branches are accessed through RADIUS server, and this has been already applied to a bank in Turkey.

HD-SDI, HDMI, CVBS video can be converted using diverse HD-CCTV converters. Let’s have a close look at the field’s examples.

Practical use of video and audio output of HD-CCTV DVR
The following [Fig. 1] shows the general usage of DVR video output. If the user connects HD-CCTV DVR output to a monitor with HDMI cable, high-definition video can be displayed on the monitor, as well as audio to speaker.

If the distance between DVR and monitor is more than 10m, the user can use HDMI2SDI and SDI2HDMI converter. By the configuration of [Fig. 2], HD-CCTV DVR’s video/audio can be transmitted up to 150m.

Recording of PC, DVD, Set-top box output by using HD-CCTV DVR
PC, DVD and Set-top box’s HDMI output can be recorded in HD-CCTV DVR. HDMI output can be converted to HD-SDI signal by using HDMI2SDI converter. Below [Fig. 3] shows the practical use of HDMI2SDI converter.

Recording analog videos to HD-CCTV DVR
SD2HD can convert up to 6 CVBS signals to one HD-SDI signal. Like [Fig. 5], up to 6 analog video input signals can be converted into a HD-SDI signal by using SD2HD converter.
Of course, SD2HD allows even only one camera input, and supports 1/4/6 split screen.

How to display HD-SDI signal on analog monitor
HD2SD has two functions. One is HD-SDI repeater and the other is to convert HD-SDI signal to CVBS. The user can connect HD-SDI signal to HD-CCTV DVR and can use analog(SD) video output at the same time.

It is very important to choose the right coaxial cable and BNC connector as well as knowing the right assembly method since HD-CCTV system’s video transmission is high-speed, 1.5Gbit per second, based on HD-SDI transmission technology. 
Please refer to the below assembly method for BNC connectors of 5C-HFBT coaxial cable.

Tools you need

Assembly method and order

In order to transmit HD-SDI video signal over a long distance, optical transmitter and receiver can be easily used. Because optical cable must be used for the transmission, please refer to the below table to choose proper optical cable.

Single-Mode cable
Used in long distance transmission. Core diameter is normally 9um and color of the jacket is yellow.

Multi-Mode cable
Core diameter is 50-100um and used in short distance transmission. Normally color of the jacket is orange.

Connector: LC type
Usually blue-colored connector is used for single mode cable
Usually beige-colored connector is used for multi mode cable