A butterfly gets pulled over by the cops for speeding. He hands the cop his driver’s license with a photo of a caterpillar on it. “Sorry, it’s an old picture.”
It is not clear where the concept of Murphy’s Law originated. Some say that the original Murphy’s Law was “If there are two or more ways to do something, and one of those ways can result in a catastrophe, then someone will do it.”
The story goes that in 1947, Murphy was involved in a rocket-sled experiment in which all 16 accelerator instruments were installed in the wrong way, resulting in Murphy’s observation. Murphy’s Law is sometimes expressed as “Anything that can go wrong, will — at the worst possible moment.”
The network cable transfers both data and power to the device, making installation very simple. The network cable includes up to eight wires. The data uses one set of wires, while the power uses another set of wires in the network cable.
This article describes how access control systems, IP Camera Systems, and IP paging systems utilize power over Ethernet (PoE)
The IP recording and management system is a crucial part of your IP camera system. If you select the wrong solution, you could find yourself without the critical video evidence you need when an incident occurs, or worse still, your security could be breached, and safety threatened because your surveillance system didn’t provide an alarm.
We compared several video recording solutions. The best video recording and management system depends on your objectives. There are two types of recording systems for IP camera systems to consider. Each one provides some unique capability.
An old man read in the paper one of his friends had been arrested for tax evasion and decided to write him a letter. He wrote that it was planting season again, but he didn’t have enough help to sow his fields this year.
The following morning a dozen law enforcement officers completely tilled the old man’s garden without an explanation. Later the mail arrived with a letter from his jailed friend which said “DO NOT DIG UP THE GARDEN WHERE I HID ALL THE CASH. It’s the best I can do from here.”
Pan tilt zoom (PTZ) IP cameras connect to the network and provide the ability to view extensive areas. A PTZ camera can move back and forth (pan), up and down (tilt), and zoom in and out. When it is combined with intelligent video management software (VMS), it provides an effective surveillance system.
This article compares several PTZ cameras. We considered several characteristics, such as the zoom lens, camera resolution, low light sensitivity, pan, tilt ability, and nighttime viewing capability. This comparison should help you select the right PTZ camera. Remember that the most critical question is to determine if the PTZ camera meets your objectives.
Access control is anything that is used to prevent the wrong people from gaining access to your secure area. A door lock and key control access. If you have a dog in your yard, with a big sign that says, “Beware of Dog!” You have access control. Access control always includes a key to allow entry. The dog only lets in the people it knows, so that’s the key.
Door access control systems use various credentialsto unlock the door. Credentials can include physical cards that we carry, a PIN number we enter, or even the physical aspect of a person (biometrics such as fingerprint or facial recognition). This article compares the credentials that we carry. They are sometimes called keycards, prox cards, or smartcards.
What is the best IP paging system? There are several configurations and implementations that can be used depending on your requirements. In general, the PA over IP system is much easier to install than the older central paging amplifier systems.
Instead of running wires from a central amplifier location, the IP paging systems use the network infrastructure that’s already in place. There is a choice of PoE powered speakers that attach to your network or small network-attached amplifiers that drive multiple speakers.
This article compares two types of implementation: the powered IP speakers, and the IP amplifiers with multiple attached speakers.
