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Technology Support
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 CCTV Camera FAQ |
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 Q:What Is Digital CCTV? |
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Recent advances in technology over the past couple of years have revolutionised the security sector and, in particular, the methods available to monitor movement and access within a specific area. Not only affordable by big business, digital CCTV is now available to the open market due to significant reductions in price and availability.
Digital CCTV
Digital CCTV comprises of a PC based, multi channel video surveillance system that utilises the most advanced compression technologies to bring you the highest picture quality and video performance. Compared to analogue CCTV, a far greater number of CCTV cameras can be connected to your network and viewed, all through a single PC monitor.
Completely upgradable, your network can be expanded quickly and easily by simply installing additional cameras. In addition, you are not restricted to the type of camera you wish to install as the CCTV software is able to support all cameras within our product range.
If you already have an analogue CCTV system installed at your site, you may only require a simple upgrade of some of the elements on your network in order to adopt to a digital CCTV system.
Picture quality of a digital CCTV system is far superior to that of an analogue system and has been used successfully in the prosecution of thieves, vandals, and trespassers through the UK's criminal justice system. All digital CCTV systems supplied by CCTV Surveillance Ltd are fully compliant with the UK Police Requirements.
Digital Video Recorders
The CCTV footage generated by your camera network is recorded on a dedicated digital video recorder, which can be located either onsite or offsite. Triggered by motion detectors or movement on a CCTV camera, the DVR only records footage of activity so no "dead time" is unnecessarily stored. Sophisticated buffering means that the DVR also records events of up to 5 minutes previous to the trigger.
A digital video recorder is able to achieve digital storage multiplexing across up to 16 channels in one standalone box, so all CCTV footage from your site can be recorded on a single unit.
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| Q:How Does Digital CCTV Work? |
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| A: |
Digital CCTV is a relatively new technology that has proclaimed itself to be the next level in security monitoring systems. Recent advances in technology over the past couple of years has made digital CCTV available and affordable for virtually anyone to implement on their premises.
Versatile in design, digital CCTV operates across a standard ethernet, so no extra wiring is required in the majority of situations. Once installed on your premises, your digital CCTV network can be added to quickly and easily simply by installing new CCTV cameras and adding these to your CCTV software package.
Once your network of CCTV cameras have been installed on your site, you are able to analyse both live and historic event-based video clips through your PC monitor using the CCTV software supplied with your system.
Digital CCTV is unique in that it will only record images when movement is detected. This ultimately means that you will only have CCTV footage of activity: when something occurs across the camera's field of view.
The quality of the footage generated by your digital CCTV cameras means that evidence quality images are generated, which can be used in a court of law to prosecute perpetrators. Analogue CCTV systems invariably are unable to do this.
The integrational capabilities of digital CCTV mean that in addition to working extremely well as a standalone security system, it can also be connected to other installed security equipment.
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| Q:What is frames per second? |
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| A: |
The frames per second (fps) relates to how many pictures the DVR will record in a second. Real time recording is about 30 fps on each camera. To calculate the fps per camera take the total fps in the system and divide it by the number of video inputs. For example, a 60 fps digital video recorder with 4 video inputs would result in about 15 fps per camera. The technology has finally gotten to the point now where real time recording is affordable. If you are recording cash registers or something similar then you should definitely invest in real time recording. |
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| Q:How big a hard drive do I need? |
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| A: |
The amount of hard drive space is very important because it will limit how many days of recording you can store before the system has to start recording over the oldest video. Each DVR will have its storage capacity listed in the specifications. But this calculation is just a rough estimate as there are many factors that affect hard drive use. The most critical factor being the compression format used by the DVR (for more info on compression formats click here). But also the type of cameras that are connected to the DVR make a difference (specifically the chip size and resolution) and also the features that are selected on the DVR. If you use the scheduling or motion detection features or tune down the frame rate that will extend the storage capacity of the unit. Even the field of view (what you are recording) will affect the storage capacity - the more complex the image, the more hard drive space it will take to capture the complexity. |
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| Q:What is the difference between a PC-based DVR and an Embedded DVR? |
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| A: |
A PC-based digital video recorder is basically a personal computer that has been modified with hardware and software to work as a DVR. An embedded digital video recorder is a machine that has been manufactured specifically to work as a DVR. In embedded DVRs there is typically one circuit board with software burned into the chip.
There used to be significant differences in features between the PC-based and the embedded machines. But with recent advancements in the embedded DVR technologies the differences are becoming less. The advantages of an embedded digital video recorder is that they are extremely stable and reliable since they contain fewer parts. The software is often written in basic machine code or Linux code which tends to be more stable than Windows software. The advantages of the PC-based digital video recorders is that they are easier to interact with because you use the on-screen menus and a mouse (as opposed to embedded which you interact with more like a VCR - via buttons). And you tend to have more features and options on the PC-based machines
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| Q:Are security digital video recorders hard to install? |
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Not at all. You simply plug the cameras into the back of the unit. For the PC-based: Plug in the power, monitor, keyboard and mouse - just like a regular computer. You will receive instructions on how to set up the machine with your shipment. |
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| Q:How do I see pictures from a remote site? |
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You can view the camera video over the internet using a modem which is slow but can display 1 or 2 frames every 5 seconds. Better is a DSL or cable modem connection which can generally display 1 frame per second. When viewing remotely, the refresh rate is restricted by the communications medium (your internet connection speed). When viewing or playing back locally, the display is dependent of the unit's frame rate (fps). You will need a static ip address available to assign to the DVR (more about this in your documentation). |
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| Q:How do I set up a camera and lens for use in Low Light conditions and or with Infra Red Lighting? |
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The answer to this is the same as that for questions relating to Back Focusing on Page 31 and 34, with the addition of the following:
When setting the back focus of a Colour camera for low light conditions you should place an ND1 (Neutral Density) filter in front of the lens. When setting the back focus of a Mono camera for low light conditions you should place an ND3 (Neutral Density) filter in front of the lens. When setting the back focus of a Mono camera fitted with I/R lighting for low light conditions you should place an IRP (Infra- Red Pass) filter in front of the lens.
Should you not have any of the above filters you may have to attend site during the hours of darkness.
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| Q:I have installed a new camera and lens why am I unable to obtain a sharp image? |
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The most common resolve to this is to ensure that both camera and lens are the same mount i.e. ‘CS’ mount lens on a ‘CS’ mount camera and a ‘C’ mount lens on a ‘C’ camera.
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| Wireless Camera FAQ |
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| Q:Can I connect wireless system onto a DVR and record? |
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Yes. There are 2 options.
1. One channel recording: connect one wireless receiver to one of the video inputs of the DVR. If there are four wireless cameras connected to the receiver (loop mode must be on) the DVR will record the four cameras in a one by one sequence. It is then possible to review the recorded files in sequence or expand the picture to full screen using the DVR buttons.
2. Multiple channel recording: example, connect four wireless receivers (each receiver having a different frequency camera) into the DVR’s four video inputs. All four cameras can then be recorded simultaneously and it is possible to review the files as a single camera display or as a quad display. |
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| Q:What's the difference between a wired camera and a wireless camera? |
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A wired camera needs a cable that goes from the camera to a TV, VCR or DVR. The video signal is passed from the camera, through the cable, and to your TV, VCR or DVR which allows you to see the picture. All wired cameras must use RCA/BNC cable to connect the camera to the TV, VCR or DVR. For example, a clock radio hidden camera will plug into the wall just like a normal clock radio. The camera transmitter hidden inside the radio is powered by the clock radio's power supply, which requires plugging the AC cord. Another example, a smoke detector hidden camera will have to have an external power source, so the AC cord needs to be transferred through a wall or ceiling in order to power the smoke detector camera.
A wireless camera does not need an RCA/BNC cable connected from the camera to the TV, VCR or DVR. That is the main advantage, without spending for any extra expensive wiring. The video signal is transmitted through the air to the receiver directly. However, wireless cameras still require power. So, either a power adapter or batteries must be used.
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| Q:What exactly does wireless mean? |
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Wireless means there is no video cable running from the wireless camera to your TV, VCR, or DVR. For outside applications, wireless means no wires stretched across your home between the wireless hidden camera and the receiver. All wireless cameras still require a power source regardless of whether it is an indoor camera or an outdoor wireless camera. A wireless receiver must always accompany a wireless camera. Also, a receiver must connect to your TV, VCR or DVR with A/V cables and requires a power source too. Thus, a wireless camera only eliminates any wires stretched across a room or outdoor location to a house.
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| Q:Can I use a 1.2GHz wireless camera, instead of a 2.4GHz camera, to avoid interference with my home Wi-Fi network or 2.4GHz cordless phone? |
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Yes, you can use a 1.2GHz wireless camera in other countries, but not in the USA and Canada, as it is restricted by the FCC. |
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| Q:Does a wireless camera still need a power adapter? |
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Yes it does. A camera wireless camera would not be operable without some source of power to it. This source of power can come from either the AC outlet (using the adapter) or from a 9 volt battery.
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| Q:Is there anyway to extend the distance of video transmission for the wireless camera? |
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No, due to FCC limitations on transmission power. It is possible to use a high powered booster (i.e. 1 watt, 5 watt, etc..) to extend the viewing range of the wireless camera system. Using a power booster for these purposes is illegal in the U.S.A. and restricted by the FCC.
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| Q:What are possible interferences that exist? |
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2.4GHz cordless phones, and 2.4GHz wireless computer networks (Wi-Fi Router) are the top two products on the market today that seem to cause interference problems with wireless camera systems. Strong static interference, large horizontal lines rolling upward, an increased noise level, and an unsteady picture are all possible problems the wireless camera system can produce. Please refer to the other equipment manufacturers for exact frequency specifications. If the wireless camera is channel selectable (not all models), please try to change channels until an acceptable picture is displayed. When using multiple wireless cameras, make certain they are using different channel numbers and set them apart at least 2 meters (6.5 ft) from each other. |
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| Q:What are the frequencies that FCC allows to use in USA and Canada without license? |
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900MHz, 2.4GHz, and 5.8GHz. Mini-Airwatch and OutdoorWatch wireless cameras utilize the 2.4GHz frequency |
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| Camera Series |
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| Q:What's the difference between "Video Drive" (VD) and "Direct Drive" (DD)? |
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Ans:
"Video Drive" (VD) and "Direct Drive" (DD) auto iris lenses are used to control the iris to keep a better image quality. A "Video Drive" lens is built in amplifier to convert the video signal from a camera for controlling the iris motor. A "Direct Drive" lens only includes the iris motor. So, this type of the lens is cheaper and the image quality depends on the output of the auto iris camera.
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| Q:What's the difference between "Manual Iris" and "Auto Iris"? |
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Ans:
A "Manual Iris" lens is the lens with adjustable iris. Normally, it is used in the indoor environment where the light condition usually remains stable. You can adjust the F number to get the best image brightness. It is the most suitable solution for the indoor environment but you need to turn off AES function to avoid color rolling problem.An "Auto Iris" lens is the lens that automatically adjusts the focal length and iris. It is usually used outdoors since it can automatically adjust the amount of light passing through. In order to set the best image brightness, you need to adjust the "LEVEL" knob on the lens (for V.D. type) or at the rear panel of the camera (for D.D. type). Then, the lens will adjust the iris based on the pre-defined image brightness when the light condition is changed.
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| Q:What is "Flickless"? |
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Ans:
This mode is used to avoid the flickering on your monitor because of the frequency differences between your system and light. Some countries use two different frequencies, and some countries use NTSC system but their voltage frequency is 50Hz. This function is enabled to not only prevent the flickering on your monitor, but also fix the shutter to decrease color rolling on your camera. However, since the amount of light passing through the lens is decreased, the sensitivity is also decreased accordingly.
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| Q:What is "Automatic White Balance" (ATW)? |
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Ans:
Typically, one object reveals different colors under different light conditions. For example, white paper becomes yellow when yellow light is projected on that paper. However, when ATW is enabled, white paper is still white through the lens and will not be affected under different light conditions. Your camera will tune the color difference automatically based on the specified white light.
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| Q:What is Auto Gain Control (AGC)? |
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Ans:
Auto Gain Control (AGC) will adjust the sensitivity of CCD pick-up elements automatically based on the light condition. When the light condition is dark, the sensitivity goes up and you can get a brighter display. When the light condition is too bright, the sensitivity goes down and you can get a darker display. When the light condition is normal, the sensitivity is also normal. "AGC" option means the sensitivity is normal; "MAX" option means the sensitivity of AGC goes to the maximum. However, the higher the sensitivity, the more the signal noise.
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| DVR Series |
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| Q:Why does my DVR show "Disc Full" but the DVD-R disc still have space? |
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Ans:
Because of the hardware design, one DVD-R disc could only backup up to 41 files. If you want to backup over 41 files to the disc, you would meet this issue.
Note: Our DVD-RW drive only supports "DVD-R" discs.
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| Q:Why does my DVR show HDD full with the usage of only 100GB, but the HDD total capacity is 250GB? |
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Ans:
It happened when you set up motion trigger recording on the Wavelet series DVRs. The motion list can only include up to 6,144 record items. The least time to be recorded is 10 seconds for each triggering. So, if you have motion triggered all the time, it will treat as HDD full when the motion list is full.
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| Q:Why does the OSD on Model AVC787 show HDD remaining space, but not the available remaining time? |
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Ans:
Because the format of MPEG (not pictures) is different from the format of JPEG (pictures), the available remaining time cannot be calculated. The situation is just like downloading files from the Internet. When you download one file from the Internet, the displayed downloading time keeps changing. For this reason, the remaining time varies dramatically, and users might have the difficulties to precisely know the actual remaining time. Therefore, our R&D team decides to use HDD remaining space instead of the available remaining time.
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| Q:Why do AVC78X Series DVRs sometimes keep rebooting? |
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Ans:
If the physical connection between HDD power cord and HDD is loose, HDD booting will be failed. And in order to let HDD booting successful, the DVR will keep rebooting. If this problem persists always, it's recommended to change another HDD or re-install your HDD. |
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| Q:How to check the firmware version in AVC777? |
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Ans:
Press and hold "Menu" first when your DVR is shutdown. Then, press "Power" to boot your DVR. You can see the firmware version displayed while the DVR is initializing. In addition, there are two MICROM IC in AVC777's PCB board: One is "Master" and the other one is "Slave". When updating your firmware by replacing MICROM IC, please pay attention to the position of "Master" and "Slave". If you face to the DVR front panel, the IC slot at the left hand side is Master and the one at the right hand side is Slave.
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| Q:Why is HDD detection failed? |
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Ans:
Please check the power adapter as well as the HDD cable and HDD power cord between the HDD cartridge & motherboard. Or, you can change to another HDD for testing.
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| Q:Why can't my USB flash drive be detected? |
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Ans:
Your flash drive may not be supported in our DVR. For detailed information, please check the compatible list in your DVR user's manual and see if the brand name of your flash drive is included.Our DVRs only recognize FAT32 format. So, please format your USB flash drive as FAT32.
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| Q:Is it possible to access video data on DVR hard disk from your PC? |
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Ans:
No. The hard disk of our DVR system can't be accessed from your PC. That's because the system format is designed only for our DVR. |
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| Q:How do I make an audio backup? |
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Ans:
The audio connection channel is showing below:
| AVC787 |
AVC785 |
AVC783 |
AVC781 |
CH13 video >> CH1 audio
CH14 video >> CH2 audio
CH15 video >> CH3 audio
CH16 video >> CH4 audio |
CH5 video >> CH1 audio
CH6 video >> CH2 audio
CH7 video >> CH3 audio
CH8 video >> CH4 audio |
CH1 video >> CH1 audio
CH2 video >> CH2 audio
CH3 video >> CH3 audio
CH4 video >> CH4 audio |
CH1 video >> CH1 audio
CH2 video >> CH2 audio |
You have to connect the relevant channel to have audio backup.
It will backup audio automatically if the certain time you want to backup has audio available. |
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| Q:How to make PTZ camera connection? |
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Ans:
1. Components:
2. Connect: 1.PTZ control 2.Power 3.Video
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3. If PTZ control is still unavailable as the connection shown in Step 3, the telephone line might have wire jumping. Please change the connection shown in Step 2 as follows: Brown to Green, and Orange to Red.
4. Setup: After connecting all devices, DVR remote setting is as follows:
5. Enter ID setting: If the connection is successful, DVR will detect PTZ ID number.
6. Switch to PTZ mode, and begin to control PTZ.
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| Video Web Server |
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| Q:What is NAT? |
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Ans:
NAT stands for Network Address Translation. It is proposed and described in RFC-1631 and is used for solving the public IP address depletion problem. At present, many Routers support this NAT function. The NAT box can "translate" the local IP addresses to global address and vice versa. In other words, it is a method of connecting multiple computers to the Internet (or any other IP network) using one public IP address.
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| Q:What is "Private Network"? |
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Ans:
Cited from RFC1918: Address Allocation for Private Internets.
Hosts within enterprises that use IP can be partitioned into three categories:
Category 1: hosts that do not require access to hosts in other enterprises or the Internet at large; hosts within this category may use IP addresses that are unambiguous within an enterprise, but may be ambiguous between enterprises.
Category 2: hosts that need access to a limited set of outside services (e.g., E-mail, FTP, net news, remote login), which can be handled by mediating gateways (e.g., application layer gateways). For many hosts in this category an unrestricted external access (provided via IP connectivity) may be unnecessary and even undesirable for privacy/security reasons. Just like hosts within the first category, such hosts may use IP addresses that are unambiguous within an enterprise, but may be ambiguous between enterprises.
Category 3: hosts that need network layer access outside the enterprise (provided via IP connectivity); hosts in the last category require IP addresses that are globally unambiguous.
We will refer to the hosts in the first and second categories as "private". We will refer to the hosts in the third category as "public".
If it is necessary for a device on a private network to communicate with other networks it's necessary for a "mediating gateway" to ensure that the outside network is presented with an address that is "real" (or publicly-reachable) so that routers allow the communication. Typically this gateway will be a Network address translation (NAT) device or a proxy server.
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| Q:What is "Private IP Address Space"? |
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Ans:
Cited from RFC1918: Address Allocation for Private Internets
The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets.
| Name |
IP address range |
Number of IPs |
Largest CIDR block |
| 24-bit block |
10.0.0.0 - 10.255.255.255 |
16,777,215 |
10.0.0.0/8 |
| 20-bit block |
172.16.0.0 - 172.31.255.255 |
1,048,576 |
172.16.0.0/12 |
| 16-bit block |
192.168.0.0 - 192.168.255.255 |
65,535 |
192.168.0.0/16 |
You can select one of the IP address listed above. For example, you can use the 192.168.100.x / 255.255.255.0 for your private use.
In Internet terminology, a private network is a network that uses RFC 1918 private IP address space. Computers may be allocated addresses from this address space when it's necessary for them to communicate with other computing devices on an internal (non-Internet) network but not directly with the Internet. |
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| Q:How can I find the IP address of my computer? |
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Ans:
Take Windows 2000 or XP O/S for an example.
Go to "Start" >> select "Execute" >> type "cmd" into the blank column >> press the "Enter" key >> type "ipconfig" and then press "Enter" key >> then you will see the following screen with information of IP address, subnet mask and default gateway.
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| Q:I want to share a cable or DSL internet connection with camera and PCs. |
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Ans:
The Broadband router will be a better solution. This will allow you to share multiple computers and camera with a single IP address from your CABLE / DSL provider.
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| Q:What is PPPoE? |
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Ans:
PPPoE stands for Point-to-Point Protocol over Ethernet. It is a non-standard method of connecting to your ISP to gain a dynamic IP address. It relies upon a software client that is provided by the ISP. A dynamic IP address is required to gain a connection to the Internet.
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| Q:What is DHCP? |
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Ans:
Cited from Wikipedia
In the context of computer networking, Dynamic Host Configuration Protocol (DHCP, currently implemented as DHCPv6) is a client-server networking protocol. A DHCP server provides configuration parameters specific to the DHCP client host requesting, generally, information required by the client host to participate on an IP network. DHCP also provides a mechanism for allocation of IP addresses to client hosts. |
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| Q:What is DDNS? |
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Ans:
DDNS stands for Dynamic DNS, is a service for transforming dynamic IP to corresponding to a specific "Hostname". There are many websites providing free DDNS services. For example, http://www.dyndns.org.
Cited from Wikipedia: Dynamic DNS is a system for allowing an Internet domain name to be assigned to a computer with a varying IP address. This makes it possible for other sites on the Internet to establish connections to the machine without needing to track the IP address itself.
Dynamic DNS service is provided on a large scale by various DNS hosting services, which retain the current addresses in a database and provide a "client" program to the user who will send an update to the service whenever the server's IP address has changed. Many routers and other networking components contain a feature such as this in their firmware. |
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| © Copyright By ShenZhen Tyjoon Electronics Co., Ltd. |
| Email:info@sztjdz.com Tel:+86-755-28223576/28223577/28223578 Fax:+86-755-28223579 |
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