Tag Archives: Ieee Standards

The crossover cable connects two Ethernet network devices to each other. They were invented for temporarily supporting host-to-host networking when a network router or another intermediary device is not available. Although crossover cables appear the same as a standard straight-through (patch) Ethernet cable, their internal wiring structures are different.

Straight Through vs. Crossover

A straight-through cable is used for connecting two different kinds of devices, such as a network switch to a computer. In contrast, a crossover cable is for connecting two devices that are identical.

The straight-through cable’s ends can be wired in any manner, but both ends must be identical. This is different from the crossover cable’s internal wiring, which reverses the signals for receiving and transmitting. The first and third wires and the second and sixth wires are crossed.

High-quality Ethernet crossover cables have special markings which allow users to distinguish them from straight-through cables. They are often red in color and the word "crossover" will appear on its casing and packaging.

Crossover Cable Needs

Crossover cables came into use during the 1990s and 2000s because the most common types of Ethernet were unable to support direct cable connections between hosts. Intended for using specific wires for both receiving and transmitting signals, the original and Fast Ethernet standards required the communication of two endpoints through an intermediary device to avoid conflicts.

The Ethernet feature MDI-X has auto-detection for the prevention of signal conflicts, enabling the Ethernet interface to automatically determine and negotiate the expected signaling convention of the device at the other end of the cable. The majority of home broadband routers and Gigabit Ethernet adopted MDI-X.

As a result, crossover cables are only necessary for the connection of two Ethernet client devices if they are not configured for Gigabit Ethernet. Nowadays, Ethernet devices are compatible with crossover cables because they can automatically detect them.

Ethernet Crossover Cables Usage

Crossover cable usage should be limited to direct network connections. When a user tries connecting a computer to an antiquated router or network switch via a crossover cable rather than a standard cable, the link can be prevented from working.

Progressive Office Cabling

Founded in 1986, Progressive Office’s success has been a direct result of years of commitment to seeking solutions on behalf of our clients in the Washington, D.C. and New York City areas. Efficiently working together, Progressive Office teams get cabling installed and operating as fast as possible while minimizing disruption and downtime. Call our toll free number (800) 614-4560 today.

Cabling utilized for network infrastructure is a crucial aspect of networking, and it has grown in importance as new technologies are introduced, including virtualization, wireless access points, blade servers, network storage devices, etc.

Although wireless technology has greatly advanced, most of the existing computer networks are still using cables as the media for transferring data. Each standardized type of network cable is utilized for a specific purpose as discussed below.

Coaxial Cables

Patented in 1880 (yes, that long ago!), coaxial cable is most familiar as the cable that connects TV sets to their antennas and also as the standard for 10 Mbps Ethernet, which was common in the 1980s and early 1990s. During this time, networks utilized two coaxial cable types, thicknet, the 10BASE5 standard, or thinnet, the 10BASE2 standard. Composed of an inner copper wire surrounded by insulation and shielding, the stiff quality of these cables made them difficult to install and maintain.

Twisted Pair Cables

During the 1970s, Ethernet was developed at Xerox, which began collaborating with Intel and DEC for its standardization. The initial specifications, titled the Ethernet Blue Book or DIX from their three company initials, was published in 1980.

In the 1990s, twisted pair cables became the primary cabling standard of Ethernet, beginning at 10 Mbps with Category 3 or Cat3, which was followed by 100 Mbps Cat5 and Cat5e and up to 10 Gbps (10GBASE-T). Ranging up to eight wires wound together in pairs, this type of cabling is intended to minimize electromagnetic interference.

Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP) are the two chief twisted pair cable types standardized by the industry. Due to lower manufacturing costs, modern Ethernet cables utilize UTP wiring. STP cabling is used by other types of networks like Fiber Distributed Data Interface (FDDI). Clearly the most common network cable type globally, UTP cable is utilized for both networking and for the traditional telephone (UTP-CAT1) cabling.

UTP-CAT5e or Cat5e has become the most common UTP cable as it replaced coaxial cable, which was unable to cope with the increasing demand for networks that were faster and more reliable.

Part 2 will cover Fiber Optics, USB Cables, and Crossover Cables.

Union Network Cabling

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Upgrading to Cat6 Cable: Requirements for a Corporate Office

Technology continues to evolve and adapt to corporate requirements. Data volume has increased significantly and processing capacity demands faster access. IT managers have predicted that data production will be 44 times larger five years from now. And enterprises have to process and protect that data. Moreover, the amount of data in your business network system grows constantly.

Until recently, this was accomplished using the Cat5 cable. However, limitations is now causing some problems because it has a maximum data rate