DoD Advanced Research
During the Cold War there was a constant need for coded systems to transmit data quickly. In the mid-1960s, the U.S. Department of Defense created what they called the Advanced Research Projects Agency (ARPA), which worked on integrating new technologies that would help the United States achieve its foreign policy goals. One of the scientists that was commissioned was Joseph Lickliter, who had the idea of connecting computers at important research centers. It was a way for engineers and intellectuals to collaborate on DoD-funded projects. The network, called ARPANET, was launched in 1969.
At first, growth was slow. Small packets were sent over telephone lines, but along the way there were many innovations that set the tone for the shared computing constructs that we regularly use today. One such innovation was packet-switching. Packet-switching allows a computer to connect to several other computers at once by sending individual packets of information. In this way, computers were able to constantly send and receive information. With this method each computer on ARPANET would have (what amounts to) an address book that is constantly updated.
As the network grew, however, this packet switching model, which was beneficial, was just too slow to facilitate an accurate account of addresses on the system. So in 1973, the engineers at ARPA decided that Stanford University (a founding member) would keep a master address book that was kept up to date by network administrators. This decongested the network significantly.
By 1977, ARPANET had over 100 computers connected to it; and, with the age of personal computing starting to rear its head, changes started to come fast. It was about this time that other computing networks began to pop up. As they first started to connect with each other there was no interoperability between them, but this problem was remedied early in the 1980s with the standardization of what is called Transmission Control Protocol/Internet Protocol (TCP/IP). This was the first time the world Internet was used.
ARPA engineers realized pretty quickly that the connecting networks that were now using the same protocol set (TCP/IP) were too numerous and were going to be unmanageable. This is when the modern Domain Name System (DNS) was introduced. They separated all addresses by domains. The first level, or top-level, domains would dictate the type of organization that a packet was being sent to. Examples include .com and .edu. Today, there are over 1,000 top-level domains out there.
A second-level domain provided the host where data packets would be delivered. Examples that you see today are amazon.com or cornell.edu. This system provided specific data packet routing, setting the stage for the modern-day Internet.
The Internet
By the late 1980s the DoD decided that ARPANET was a success and shut it down. It was handed off to a private company called NSFNET in 1990. In 1992, the modern Internet Service Provider (ISP) was created as the U.S. Congress passed a law allowing commercial traffic on the newly formed Internet.
Nowadays, the United Nations has proclaimed that Internet service is now a fundamental human right. This marvel of human ingenuity would not have been possible without ARPA and ARPANET. If you would like to see more articles about technology’s history, subscribe to the Coleman Technologies blog today.
Type A connections support USB 1.0, 2.0, 3.0, and 3.1, with transmit speeds ranging from 1.5 MB/s to 1.25 GB/s. These connections are the most common ones found on at least one end of every USB cable.
Type B connections also support USB 1.0, 2.0, 3.0, and 3.1. These were once used for connecting a printer or similar device to a computer, but they are being slowly phased out.
Mini and Micro both support USB 2.0, with mini USB connections being used for some older devices. Those that don’t use mini USB connections have been replaced by Micro-USB, and even those are being phased out for Type C connections.
Type C connections, also sometimes referred to as USB-C, support USB 3.1, 3.2, and the upcoming USB 4 standard.
The Video Graphics Array cable is less popular these days due to its analog video signal being replaced by digital. Even so, there is likely to be a VGA port on your video card or display.
VGA cables were phased out during the turn of the century and replaced by Digital Visual Interface cables. DVI is known for having many different types, all of which have their own capabilities, but they have been replaced by modern display cable types at this point.
DisplayPort cables were introduced with the intention of replacing both VGA and DVI cables, as they are capable of transmitting both video and audio signals. There are many different kinds of DisplayPort out there, but the important thing to note is that they are compatible with each other. DisplayPort can also be used in conjunction with HDMI and USB if there is an adapter used. These days, DisplayPort is used to attach a monitor to another device.
High-Definition Multimedia Interface cables are used to send modern standard digital signals. Five different types of HDMI exist today, but it’s most likely that you’re familiar with Type A. You may have also seen Type C for digital cameras, or Type D for mobile devices.
Serial Advanced Technology Attachment cables create a connection between a computer’s motherboard and a storage device. These offer quick data transfer speeds compared to their predecessors, the Integrated Drive Electronics cable.
eSATA cables are basically the same as SATA cables, only for external devices rather than internal components. These connections aren’t as common anymore, as USB technology has grown so quickly that it has eclipsed their speed.
A local area network takes advantage of ethernet cables. These cables are those that connect to your modem, router, and computer. They are easy to distinguish from other cables, as they look quite similar to telephone cables from way back when.

