About Technology Archives

How to Select the Best IP Intercom

Posted on July 12, 2016March 22, 2020 by Bob Mesnik

What are the features and functions to look for when selecting your IP intercom?

By Bob Mesnik

IP intercoms are simple in concept, but complex in practice. They are easy to install, but there are many options to consider. We have evaluated a number of different types of intercoms, and found that the more successful products are provided by those who understand the black art of audio, rather than science of networks.

What are the most important features and functions for an IP intercom system?

Of course, the sound quality of all the intercoms is one of the most important aspects to consider. Reliable communication is another important capability. After all, controlling a door is one aspect of your overall security. Many of the other features and functions depend on the application. For example, some intercoms just include two-way audio, while others also include video. Some can control an electric lock or interface to an IP door access control system. You may need a system that allows you to communicate with a Windows computer, or one that communicates with your smart phone. Here are the features and functions you should consider when selecting your IP intercom system.

Detection, Recognition, and Identification – Thermal vs. Optical IP Camera

Posted on June 21, 2016March 22, 2020 by Bob Mesnik

Resolution required for Recognition, Detection, Identification depends on the type of camera

By Bob Mesnik

There is some confusion in the industry about how much camera resolution is required to detect an object, recognize the type of object, or identify exactly what or who it is. The criteria are different between thermal and optical cameras. Resolution for thermal cameras and optical IP cameras are measured differently.

For example, when defining the performance of a thermal camera we use the Johnson Criteria of “detection”, “recognition” and “identification” (DRI).

On the other hand, IP camera resolution performance is usually defined by the number of pixels in the sensor, and we are usually interested in the ability to identify a person.

How much resolution do you need? This article compares how resolution is defined using thermal and optical technologies.

What IP Camera Resolution Do You Need?

Posted on June 20, 2016March 22, 2020 by Bob Mesnik

How to determine the resolution required for your IP camera system
By Bob Mesnik

How much resolution do you need? It depends on what you need to see. Do you want to identify who stole your car, or just see that there’s a dog in your yard again.

It’s very important to first determine exactly what you want to see, because it will affect how much your IP camera system costs.

This article reviews the amount of resolution required to recognize objects such as people, vehicles, license plates, or even a small crack in a wall.

How Power Over Ethernet Works

Posted on May 17, 2016March 21, 2020 by Bob Mesnik

PoE makes installation very easy

By Bob Mesnik

This article has been updated on 10/4/2018 to reflect the new PoE injectors available.

Many network-attached devices, such as IP cameras, VoIP phones, WiFi radios, and IP door readers use power over Ethernet (PoE). The single network cable transfers both data and power to the device making installation very simple. The data uses one set of wires, while the power uses another set of wires in the network cable.

The Difference Between Jukeboxes and CD/DVD Servers

Posted on March 11, 2016March 22, 2020 by Dennis Gallen

CD Servers, RAID, Optical Disc or Cloud Storage? That is the question
by Dennis Gallen

“What’s the difference between a jukebox and a CD/DVD Server?” That was the question we used to get. It was a time when CD-and DVD discs were a great way to archive data. Today the there are a number of different storage options available. We continue to get questions about the best way to store data. We are asked, “What is the difference between Cloud storage and optical disc storage? And, “What is the difference between tape and optical discs”?

How to Comply With the Archiving Regulations Without Paying an Arm and a Leg

Posted on March 8, 2016March 22, 2020 by Bob Mesnik

Optical Archiving Libraries make it easy to protect your data.
by Bob Mesnik

So you are being dragged kicking and screaming to archive your e-mails and data. What can you do that doesn’t cost an arm and a leg? Well, the new jukebox library systems with the latest 100 GB media are now an economical alternative to tape, and provide the best way to archive your data.

The library software makes the jukeboxes easy to use so you can archive your data quickly and automatically. Blu-ray media is now the same price per megabyte as the tape media, and provides archive quality that’s not available with tape.

How Blu-ray Optical Discs Work

Posted on March 1, 2016June 22, 2020 by Bob Mesnik

The technology for storing data continues to bring us ever-increasing capacity. First, there were CD-ROM discs, next the DVD-discs, which increased capacity and data transfer speed. Now we have blu-ray discs that provide 100 GB of storage. They are used in optical jukeboxes or libraries for archiving computer data

Blu-ray Discs (BD) was introduced by Sony in October 2000. Even though this new technology was developed for the consumer market, it also was capable of handling computer data. As a matter of fact, Blu-ray became the standard in both markets.

How to handle all the Information that needs to be Archived

Posted on February 29, 2016March 22, 2020 by Bob Mesnik

Meeting the requirements of the Sarbanes-Oxley Act

As I recall, the first optical discs became available in the fall of 1984. I was working for Sony at the time, and one of the engineers from Japan visited our office in New Jersey. “Bob”, he said, “Do you want to sell WORM in the US?” I looked at him kind of funny and said, “We don’t eat worms in this country”. “Oh no Bob-san, not worms, Write Once Read Many – W, O, R, M. This is optical disc”. This was my first introduction to optical storage. The technology has improved dramatically over the years and the market for the product has grown. Today optical disc systems are starting to replace tape libraries. The cost per megabyte is about the same, but optical storage is archival while tape is not.

There are many reasons to archive corporate and government information. For example, the Sarbanes-Oxley Act of 2002 defines regulations for saving information. Here is a summary of some of the reasons for using optical jukeboxes to meet these requirements:

How Surge Protectors Work

Posted on February 28, 2016March 22, 2020 by Virginia Fair

Ligtning’s Thief, by Virginia Fair

Once upon a time a major university installed IP cameras throughout its campus in reaction to a wave of violence perpetrated against female students. All went well until a passing thunderstorm brought a lightning strike which just happened to hit an IP camera mounted on the parapet of a dorm. Of course the camera was destroyed, but have you ever heard the phrase “greased lightning”? It’s a very descriptive term for within seconds, the surge created by the lightning traveled through the IP camera system, and the network destroying both the server and the switch, creating havoc right down to the network cards in students’ laptops at the end of the cable runs.

Comparison of the Classic Analog Paging System to the PA over IP Systems

Posted on February 27, 2016March 22, 2020 by Bob Mesnik

This article compares central analog amplifiers to distributed digital network attached amplifiers.

The latest IP paging systems utilize the Ethernet network to distribute sound over your organization. This is quite different than the classic systems that used a large central amplifier with wires to all the speakers. How good is this new approach to paging?

The following article compares the traditional approach that utilizes one large amplifier to the latest PA over IP systems.

The classic method of providing a paging system was to connect many speakers to a central very large amplifier. The latest IP amplifier method is much more flexible. It connects a few speakers to many small network attached amplifiers that are distributed around the organization. You can attach several speakers to one small IP amplifier or attach one CAT5 ready IP speaker directly to the network. Here’s a comparison the two types of systems.