The CCTV Doctor: Make way for HVR

07 Dec 09

By Alistair Enser

CCTV Doctor Alistair Enser of Siemens Security Products looks at where installers should use hybrid video recorders…

Q: What is an HVR, and how is it different from a DVR and an NVR?

A: A DVR (digital video recorder) records images from analogue cameras, while an NVR (network video recorder) records images from IP cameras. An HVR (hybrid video recorder) can record images from both analogue and IP cameras. All record on to hard disks.

There is no such thing as a hybrid DVR. When people say that, what they really mean is an HVR.

Q: When should HVRs be used?

A: The usual application is upgrading existing systems that use analogue cameras. Using an HVR means that money can be saved by retaining existing cameras but, as extra cameras are needed or the old ones need replacing, IP cameras can be fitted. This means that the user ends up with a full IP system, but spreads the cost of conversion.

Q: Is there anything to watch out for when choosing an HVR for a client that eventually wants to convert to a full IP system?

A: Yes! Some low-cost HVRs are really DVRs with facilities added for handling a small fixed number of IP cameras. These are fine if a few IP cameras are being used to expand an existing system and no more IP cameras will ever be added.

If, however, the plan is to replace analogue cameras as they wear out by IP cameras, a hybrid video recorder of this type is not suitable. Instead, choose a more versatile model where reducing the number of analogue inputs means that more IP cameras can be handled.

Also, be sure to choose an HVR with multi-protocol support, so that you’ll have the widest choice of compatible IP cameras when you come to buy them.

Q: Is it really worth buying any sort of digital recorder? I’ve read that ordinary PC hardware with CCTV software is a better solution.

A: That depends on what’s meant by better! In practice, good quality PC hardware to form the basis of a reliable CCTV installation will cost at least as much as a digital recorder and, with the recorder, you can be confident that the hardware is robust, dependable, and properly specified for the job it’s doing.

Credits :

Alistair Enser is sales & marketing director of Siemens Building Technologies Security Products, a leading supplier of innovative security products and systems, encompassing access control, CCTV, intruder and integrated security management systems. Siemens Security Products serves the UK and Republic of Ireland for pre-qualification, supply, training and after sales support for products bearing the Bewator and Siemens brands.

Contact 0871 386 0835 or Visit Siemens Security Products' site