vpn and connecting branches
A more scalable solution is to connect branch offices using a site-to-site virtual private network (VPN). Let’s look at how a VPN can offer you maximum scalability while ensuring that communications between offices stays secure.
Basic branch office connection
In this scenario, your company wants to establish a VPN between the subnets of two remote departments through a pair of iSeries(TM) computers acting as VPN gateways.
Basic business to business connection
In this scenario, your company wants to establish a VPN between a client workstation in your manufacturing division and a client workstation in the supply department of your business partner.
Protect an L2TP voluntary tunnel with IPSec
This scenario illustrates a connection between a branch office host and a corporate office that uses L2TP protected by IPSec. The branch office has a dynamically assigned IP address, while the corporate office has a static, globally routable IP address.
Use network address translation for VPN
In this scenario your company wants to exchange sensitive data with one of it’s business partners by using OS/400(R) VPN. To further protect the privacy of your company’s network structure, your company will also use VPN NAT to hide the private IP address of the iSeries it uses to host the applications to which your business partner has access.
The definition of DVR is “Digital Video Recorder” A DVR camera is a security system which links one or more cameras to a digital video recorder. It’s main advantage is that it can record for much longer periods without the need to change tapes. The technology also means it is possible to review footage immediately while continuing to record.
Analog & Time Laps (VCR based) Systems
When using a VCR in CCTV time-lapse system it is important to realize that not all of the pictures from the camera are being recorded. For example with a VCR in twenty four hour mode, only one picture in eight coming from the camera is actually being recorded onto the tape. The recording has a short interval between each recorded picture of approximately one devide three sec. and this gives the jerky movie’ type pictures on playback.
Analog / Time Lapse System Overview
Benifits like System is very low cost and easy to maintain. Computer skills are required to operate them.
PC based DVR?
PC based DVR provide far better video recording clarity over Time Lapse and are easier to use and more flexible than standalone DVR’s. These units are available as kits which you install on your PC or as complete factory built recorders and provide you with all the functionality you need for your Surveillance system. Some factory models can be expanded as your needs grow, this is not the case with Time Lapse or standalone (Hardware) DVR’s.
Standalone, Surveillance DVR System.
Standalone DVR are computer base Machine which run on Linux, Unix or other proprietary Operating system that was design to run only one application, which makes the standalone Device a reliable appliance and does one thing only. Because of that, standalone DVR are more reliable but limited in the functionality and upgrades.
IP Network Camera
Unlike analog video systems, network IP camera uses the network, rather than dedicated point-to-point cabling like Siamese, as the backbone for transporting information. The term network video refers to both the video and audio sources available throughout the system. In cable (Coax) a network IP camera (video application), digitized video streams are transferred to any location in the world via a wired or wireless IP network, enabling IP video monitoring and recording from anywhere on the world.
A network video recorder (NVR) is a software program that records video in a digital format to a disk drive, USB flash drive, SD memory card or other mass storage device. An NVR contains no dedicated video capture hardware. However, the software is typically run on a dedicated device, usually with an embedded operating system. Alternatively, to help support increased functionality and serviceability, standard Windows and Linux operating systems are used with standard Intel processors and video management software. An NVR is typically deployed in an IP video surveillance system.
Network video recorders are distinct from digital video recorders as their input is from a network rather than a direct connection to a video capture card or tuner. Video on a DVR is encoded and processed at the DVR, while video on an NVR is encoded and processed at the camera, then streamed to the NVR for storage or remote viewing.
Hybrid NVR/DVR security systems exist which incorporate functions of both NVR and DVR; these are considered a form of NVR.
NVR home security systems are wireless (there are also wired systems), tend to be easy to set up, can be accessed through a web browser, and allow the user to be notified by email if an alarm is triggered.