Call Us:    +91 09811-995554

BASIC KNOWLEDGE

  • home
  • Basic Knowledge

Popular Question

AHD CCTV is an analog high definition closed-circuit television video surveillance standard that utilizes coax cable to transmit HD video from security cameras to DVRs. AHD supports from 720p to 5MP HD resolution.

Analog: Goes up to 1000 TVL
AHD: Analog High Definition – up to 5MP resolution.
CVI/TVI: Different Manufactures.
SDI: Full High Definition – 1080p
IP: Network/Digital cameras.

AHD (Analog High Definition) CCTV cameras are capable of capturing high definition video surveillance at up to 5MP resolution.
These cameras are used with AHD DVRs (Digital Video Recorders) & have the convenience of plug and play installation. Cameras and DVR are connected through BNC(Bayonet Neill–Concelman) cable which provides power to cameras & transfers feed to the DVR for recording, video & alarm management.

The installation of AHD cameras is done using coaxial cable.

Our security cameras have a female BNC connection.

A WDR camera (Wide Dynamic Range) is used for capturing images of objects surrounded by a strong backlight, while still keeping the background visible. A typical use for a WDR camera is capturing scenes indoors that have large windows in the background with lots of sunlight. A WDR camera would enable you to capture both the indoor and outdoor/background scene clearly.

WDR technology uses a special high-speed sensor to make two consecutive image scans to one picture. Non-WDR cameras just make one pass. The first scan captures images in the normal light condition. Right after, the camera captures the second image at high speed to capture the images that are in the strong light. The image processor then superimposes the two video images to provide a single picture that can see all areas.

No, our infrared security cameras (which use LEDs) are designed for use in both low light and lit conditions, so sunlight will not damage them. The infrared LEDs stay off during the day while there is light outside and then turn on at night in the dark (when they sense low light).

Yes, if an OSD joystick (switch/button) is added to camera cable, the user can switch between the camera modes – AHD/CVBS/CVI/TVI.

Yes, a good quality passive video balun can transmit the HD-AHD signal.

Yes

The user can switch between the modes through OSD menu:
Long press Right button- TVI
Long press Up button- Analog
Long press Down button- CVI
Long press Left button- AHD

Yes, when switched to CVBS mode, the user can connect the AHD camera to analog DVR.

Yes, after connecting the camera to DVR, the user can view the camera through DVRs’ network view function.

XVR mobile application for Android, it can be downloaded from the Play store.

A CMOS sensor is used in AHD cameras.

CMOS is an abbreviation for Complementary Metal-Oxide Semiconductor. An Image sensor that converts light into electron.

main differences are:
1. CCD sensors create high-quality, low-noise images. CMOS sensors, traditionally, are more susceptible to noise.
2. Because each pixel on a CMOS sensor has several transistors located next to it, the light sensitivity of a CMOS chip tends to be lower. Many of the photons hitting the chip hit the transistors instead of the photodiode.
3. CMOS traditionally consumes little power. Implementing a sensor in CMOS yields a low-power sensor. CCDs use a process that consumes lots of power. CCDs consume as much as 100 times more power than an equivalent CMOS sensor.

The different sensor types in AHD cameras are:
1MP-1/4” HD-CMOS
1.3MP- 1/3” HD-CMOS
2MP- 1/2.9” HD-CMOS
3MP- 1/2.7” HD-CMOS

There are mainly two lens categories of AHD Camera – Fixed & Varifocal lens. Generally, a wide range of fixed lens like 3.6mm, 6mm, 8mm, and 12mm is used as per requirement. By default, a 3.6mm lens is used in all AHD cameras.

A varifocal lens is a CCTV camera lens with variable focal length in which focus changes as focal length changes. A 2.8-12mm lens is used in varifocal AHD cameras.

An ICR (IR-Cut Filter Removable) is a mechanical shutter design placed between the lens and the image sensor and is controlled by a motor or an electromagnet. When the ICR is switched on, it blocks infrared light and allows only visible light to pass through. When the ICR is switched off, infrared light is allowed to pass and the images turn to black & white mode (more sensitive to infrared light).

Digital signal processing cameras use a DSP chip to digitize analog video streams. Analog video streams are generated by sensor, which DSP chips then convert into a digital video signal. DSP cameras provide a number of notable advantages over analog cameras, including increased brightness, added stability, greater sharpness and resolution, greater power efficiency, reduced sensitivity to noise and more.

IR array LEDs is used in the AHD cameras.

An IR LED (Infrared Light Emitting Diode) is a solid-state lighting (SSL) device which emits light in the infrared range of the electromagnetic radiation spectrum. IR LEDs allow for cheap, efficient production of infrared light, which is electromagnetic radiation in the 700 nm to 1mm range. IR LEDs are used in a number of types of electronics, including many types of remote controls for televisions and other electronics. Used with infrared cameras, IR LEDs can act like a spotlight while remaining invisible to the naked eye.

The main difference and the benefits of an IR/Array over LED are:
1. Long life.
2. High efficiency.
3. High brightness.
4. Even light.
5. Small size.

AHD camera requires an AHD DVR of the compatible resolution. For example, a 3MP AHD camera will be supported by a 3MP DVR.

the advantages of an AHD camera are:
1. Wide range of resolution/s
2. Supports long transmission signal
3. Low cost

Coaxial cable is used for connecting the camera with the DVR. Most integrators use CCTV cable (3+1) which carries Video + Audio + DC power and has the limitation over long distance transmission due to the power and video signal drop.

All our AHD camera with 6 Array Led require a maximum of DC 12V/300mA power to run (at night-vision). As the cable distance increases, the power drops & power requirement increases. It is suggested to provide 1-ampere power/camera.

Camera installation angle plays a crucial role. Users should ensure the dome camera cap does not come in front of array LEDs.

To switch AHD camera to other formats like TVI/CVI/CVBS with mode switch button cable, follow the below instructions:

A digital video recorder (DVR) is an electronic device that records video in a digital format to a disk drive.

Some of the key features are:
1. HD resolution/ Live view up to 3MP
2. Recording & playback
3. PTZ control
4. Remote access & mobile view

Pentaplex DVR performs all the functions of DVR at the same time: record, view/playback, network (remote view), administration and backup.

A 5-in-1 DVR support Analog, AHD, CVI, TVI, and IP technologies. All WallCam DVRs are 5-in-1.

H.264 video compression.

G.711 audio compression.

AHD DVRs supports SATA 3.5” HDD. We recommend only surveillance HDD for our DVRs. All our DVRs support up to 8TB HDD.

Benefits of Surveillance HDDs: High-Write Workloads: PC drives are engineered for storage and perform read and write as well as data transfer capability, while the surveillance drives are tuned for 90% of its time (24x7x365 days) for recording video and 10% for reviewing and playing back data. Reliability: Normal PC HDDs doesn’t come with the ability to withstand always-on operational demands and not include the application specific features necessary to handle surveillance environments. On the other hand, surveillance HDDs are built to record data 24×7 from multiple camera streams or channels. Low-power profile: Video and surveillance HDDs offers low-power profiles, which not only help with energy conservation but also ensure cool operating temperatures and enhanced system reliability while working a 24×7 profile.

All AHD DVRs come with a standard BNC Video input (depending on the model the number may increase). There are two output ports – VGA & HDMI.

All AHD DVRs come with a standard power adapter along with the kit.
The Power Ratings of the adapter are:
DC 12V/3A – 4CH & 8CH AHD DVR
DC 12V/4A – 16CH AHD DVR
DC 12V/5A – 32CH AHD DVR

In case less power supply is given to the DVR, then either the DVR may not boot properly or the HDD may not be detected.

For installation details, refer the manual provided with the DVR. While installing the HDD please ensure the DVR is powered off, then open the outer cover and screw the HDD in the given space.

The users can record the feed from the camera by right clicking on DVR menu and entering the record mode, which has three options: manual record, schedule record & stop record. Manual record: This option is available for 24×7 recording Schedule record: In this mode, schedule timing, motion detection and any alarm based recording can be done. Stop record: User can stop recording of any particular camera as per their requirement.

The recordings can be kept as long as the users have space on their DVR’s HDD. When the hard drive gets full, by default the DVR will start deleting the oldest recording to accommodate new recording.

Go to >>>Main menu>>>Advanced>>> HDD manage. HDD used space is shown on the list.

No, the users can’t delete any specific time recordings. There is only one way to delete complete recording by formatting the HDD.

Yes, the back-up can be taken on the device pre-formatted in FAT32. In case it is not, then the backup device should be connected to the PC and converted to FAT32 format.

There two options for the backup format in DVR: H.264 & AVI. This selection can be accessed from the backup menu page in the AHD DVR menu.

Yes the users can connect their WallCam PTZ camera to the DVR by RS485 connector (A+ and B-). After connecting the PTZ,
Go to>>> main menu>>>system>>>PTZ config & match the below settings:
Address – same as the PTZ (1-255)
Baud rate – same as the PTZ (2400, 4800, 9600)
Protocol – same as the PTZ (Pelco-D/P)
Now right click on desktop, go to>>>PTZ control & check to manually rotate the PTZ.

The default username is “admin” and password is (blank).

Yes. Go to main menu>>>advanced>>>account & create new username/password.

No, there is no master password. However, there is a password recovery tool in the CD given along with DVR. The users are suggested to call to customer care for resetting the password.

No, the master password can only be used by direct login through the DVR menu (monitor).

No, the same can only be done by connecting to the monitor.

Earthing/grounding can be provided to the DVR by simply connecting the earthing wire with DVR body and tightening the screw.

The DVR supports various alarms for – motion detection, video blind, video loss and abnormality functions like IP conflict, disk error.

No. However, the users can access the DVR’s output by connecting the DVR on LAN with Laptop and access via IE or CMS.

Connect the DVR on LAN cable with router/switch. Now go to main menu>>>network>>> click on DHCP and save. Restart the DVR & note down the modified IP. Again unmark the DHCP option and save. Now open Internet Explorer >>>open the DVR IP URL>>>user login and see the live preview.

Download our corporate brochure

Download.Pdf