(i) Registered Jack-11 (RJ-11)
The RJ-11 connector is mainly used for terminating telephone wires. It has a capacity of three telephone lines (six pins) but only four pins are commonly used. The connector looks similar to the RJ-45 connector used in computer networking. It comes in a plastic casing and is smaller than the RJ-45 connector. Only two pins are used for a single telephone line, but four pins are used for a Digital Subscriber Line (DSL). Most installers provide all four wires in order to connect an extra telephone line, if required.
(ii) Registered Jack-45 (RJ-45)
The RJ-11 connector is mainly used for terminating telephone wires. It has a capacity of three telephone lines (six pins) but only four pins are commonly used. The connector looks similar to the RJ-45 connector used in computer networking. It comes in a plastic casing and is smaller than the RJ-45 connector. Only two pins are used for a single telephone line, but four pins are used for a Digital Subscriber Line (DSL). Most installers provide all four wires in order to connect an extra telephone line, if required.
(ii) Registered Jack-45 (RJ-45)
The RJ-45 connector is little bigger than the RJ-11 connector and is used for terminating twisted cables. It uses eight pins, instead of four or six, in the RJ-11 connector. RJ-45 is the most common type of connector used in computer networks.
Cables can be wired in either a straight or crossover fashion using the RJ-45 connectors. Figure shows an RJ-45 connector.
(iii) F-Type
The F-Type connector (or simply the F connector) is used to terminate RG/6 and RG/59 coaxial cables used with cable television. They are also used for connecting cable modems and satellite receivers. The connector has a screw that is tightened to secure the physical connection. Figure shows an F-Type connector.
The F-Type connector (or simply the F connector) is used to terminate RG/6 and RG/59 coaxial cables used with cable television. They are also used for connecting cable modems and satellite receivers. The connector has a screw that is tightened to secure the physical connection. Figure shows an F-Type connector.
(iv) BNC connectors
BNC connectors (BNC stands for Bayonet Neil-Concelman) are also used for terminating coaxial cables, but unlike the F-Type connectors, they do not use the screw. The connector is twisted to make the connection. These connectors are commonly used with 10Base2 networks that use thin coaxial cable. Since 10Base2 networks are rarely used these days, the BNC connectors are also not much in use. The BNC family of connectors includes T-connectors, Barrel connectors, and terminators. Figure shows some BNC T-connectors.
BNC connectors (BNC stands for Bayonet Neil-Concelman) are also used for terminating coaxial cables, but unlike the F-Type connectors, they do not use the screw. The connector is twisted to make the connection. These connectors are commonly used with 10Base2 networks that use thin coaxial cable. Since 10Base2 networks are rarely used these days, the BNC connectors are also not much in use. The BNC family of connectors includes T-connectors, Barrel connectors, and terminators. Figure shows some BNC T-connectors.
(v) Fiber optic connectors
Connectors used for fiber optic cabling come in a variety of shapes. Due to fast developments in this technology, a large number of connectors are not available in the market. These include push-pull, snap-in, and twist type connectors. All connectors are used in pairs to allow full-duplex communications. The Network+ exam expects you to identify only four types of connectors: SC, ST, LC, and MT- RJ. A brief description of these connectors is given in the following paragraphs:
Connectors used for fiber optic cabling come in a variety of shapes. Due to fast developments in this technology, a large number of connectors are not available in the market. These include push-pull, snap-in, and twist type connectors. All connectors are used in pairs to allow full-duplex communications. The Network+ exam expects you to identify only four types of connectors: SC, ST, LC, and MT- RJ. A brief description of these connectors is given in the following paragraphs:
Subscriber/Standard Connector (SC)
An SC connector uses the push-pull mechanism and is shown in Figure . This connector provides good protection for the ends of a fiber optic cable and is easier to connect and disconnect in tight spaces than the ST connector, which is listed next.
An SC connector uses the push-pull mechanism and is shown in Figure . This connector provides good protection for the ends of a fiber optic cable and is easier to connect and disconnect in tight spaces than the ST connector, which is listed next.
Straight Tip (ST)
An ST connector is an older type of fiber optic connector. It uses the “twist- on/twist-off” bayonet mechanism to make the connection. Figure shows an ST connector.
An ST connector is an older type of fiber optic connector. It uses the “twist- on/twist-off” bayonet mechanism to make the connection. Figure shows an ST connector.
Lucent Connector (LC)
An LC connector has a small flange on top that secures the connection in place. This connector also uses the push-pull mechanism. Figure shows an LC connector.
An LC connector has a small flange on top that secures the connection in place. This connector also uses the push-pull mechanism. Figure shows an LC connector.
Mechanical Transfer-Registered Jack (MT-RJ)
An MT-RJ connector resembles an RJ type connector. These connectors always hold two fiber cables to allow full-duplex communications. Figure shows two MT-RJ connectors.
An MT-RJ connector resembles an RJ type connector. These connectors always hold two fiber cables to allow full-duplex communications. Figure shows two MT-RJ connectors.
(vi) IEEE 1394
The IEEE 1394 interface is also known as Fire wire. This interface is mainly used in high-bandwidth applications, such as digital video and portable storage. The IEEE 1394 connectors come in six-pin and four-pin configurations as shown in Figure.
(vii) Universal Serial Bus (USB)
USB interfaces have become very popular in computers and other digital consumer devices due to their performance and Plug-n-Play-compatibility. USB devices can be connected or disconnected into any device without having to turn off power. These devices do not need any manual configuration. USB connectors are available in a variety of sizes and shapes, but the two popular types are: Type A and Type B. The Type A connector is mainly used on computers and the Type B connectors are mainly used for peripherals. Figure shows both Type A and Type B connectors.
USB interfaces have become very popular in computers and other digital consumer devices due to their performance and Plug-n-Play-compatibility. USB devices can be connected or disconnected into any device without having to turn off power. These devices do not need any manual configuration. USB connectors are available in a variety of sizes and shapes, but the two popular types are: Type A and Type B. The Type A connector is mainly used on computers and the Type B connectors are mainly used for peripherals. Figure shows both Type A and Type B connectors.
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