CompTIA®A+ Exam Notes : Identify The Various Types Of Network Cables And Connectors


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2. Networking

2.1 Identify the various types of network cables and connectors.

The connector types commonly used for Fiber Optic networking are SC,ST, or MIC connectors. IDC/UDC is used in Token Ring networks. RJ-45, BNC connectors are commonly used in Ethernet networking.

1. ST connectors are the most common type of commercial fiber optic connector. These connectors utilize an exposed plastic tube housing the optical fiber. This requires a connection to a matching cable on the other side, incorporating a connector that mates to the other. These combine in a spring-loaded twist, reminiscent of BNC connectors, and are noted for their reliability.

2. SC connectors have the ferrule that houses the fiber mostly concealed. Probably the most similar commercial equivalent of To slink, SC connectors does not require a mating cable on the other side. Instead, these snap-on connectors simply push into their jacks with a click.

3. FC connector is similar to ST connectors, these fiber optic connector's screws into their mating jacks. Additionally, the tube surrounding the optical fiber is typically shrouded in ceramic or metal, as opposed to being fully exposed. The inner ring of the connector is keyed to ensure positive mating to its corresponding jack.

Fiber Connectors

4. LC cables latch and release into their jacks in a manner similar to Ethernet connectors. Smaller in form than SC connectors, their durability is not compromised, nor is cost increased. Instead of snapping or thermo forming the connector to the cable, it is glued. This makes it a popular connector for field use.

Twisted Pair:

RJ -11: These connectors are used to link modem/phone to the phone line. They have only two pins that get into the modem.

RJ -14 : RJ-14 connectors are dual-line phone jacks that can accommodate up to two phone lines.

RJ -45: RJ - 45 cable is widely used for attaching UTP cable in LAN environment. These connectors have eight pins.

T568A and T568B are the two color codes used for wiring eight-position RJ45 modular plugs. Both are allowed under the ANSI/TIA/EIA wiring standards. The only difference between the two color codes is that the orange and green pairs are interchanged.

Color codes are provided on some motherboards to ensure that a technician identify LIKE memory slots to insert memory sticks.

The fig. Below shows the color codes used in T568A and T568B

color codes used in T568A and T568B

Coaxial cables : Coaxial cables are high-frequency transmission cables made up of a single solid-copper core. Data is transferred electrically over the inner conductor and has 80 times more transmission capacity than twisted pair cables. This type of cable is commonly used to deliver TV signals (its higher bandwidth makes it more suitable for video applications) and to connect computers in a network. Along with stable transmission of data, coaxial cables also have anti-jamming capabilities and can effectively protect signals from being interfered. The cost is slightly higher than twisted pair but still considered more economical than fiber.

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