Cabling, Lines, and Services

Bandwidth

The total amount of information that can traverse a communications medium measured in millions of bits per second. Bandwidth is helpful for network per¬formance analysis. Also, availability is increasing but limited.

Crosstalk

An electrical or magnetic field that is a result of one communications signal that can affect the signal in a nearby circuit.

Near-end Crosstalk (NEXT)

Crosstalk measured at the transmitting end of a cable.

Far-end Crosstalk (FEXT)

Crosstalk measured at the far end of the cable from where the transmission was sent.

Unshielded twisted-pair (UTP) cables are vulnerable to Electromagnetic Interference (EMI) and use an RJ-45 connector. Fiber-optic cables are not susceptible to EMI.

data cabling work

Use a straight-through cable to connect the following devices:

.      Terminated directly into a dedicated hub or switch port

.      From a PC to a switch or a hub

.      From a router to a switch or a hub

Use a cross-over cable to connect the following devices:

.      From switch to switch

.      From router to router

.      From PC to PC

.      From a PC to a router

.      From a hub to a hub

.      From a hub to a switch

Spread Spectrum Wireless LANs allow for high-speed transmissions over short distances.

Wireless Fidelity (Wi-Fi) is defined by IEEE 802.11.

Standard Speed Media Type Connector Used
10BASE-2 10Mbps RG-58 coaxial BNC
10BASE-5 10Mbps RG-58 coaxial BNC
1 0BASE-T 10Mbps Category 3, 4, or 5 UTP or STP RJ-45
1 0BASE-FL 10Mbps Fiber-optic SC or ST
TABLE FF.10 Comparison of Fast Ethernet 802.3u Characteristics
Standard Speed Media Type Connector Used
1 00BASE-T4 100Mbps Category 3, 4, or 5 UTP or STP RJ-45
1 00 BASE-TX 100Mbps Category 5 UTP or STP RJ-45
100BASE-FX 100Mbps Fiber-optic SC or ST
Standard Speed Media Type Connector Used
1 000BASE-T or 1 000BASE-TX 1000Mbps or 1Gbps Category 5 UTP or higher RJ-45
TABLE FF.12 Comparison of Gigabit Ethernet 802.3z Characteristics
Standard Speed Media Type Connector Used
1 000BASE-CX 1000Mbps or 1Gbps Shielded copper wire Nine-pin shielded connector
1 000BASE-SX 1000Mbps or 1Gbps MM fiber-optic SC or ST
1 000BASE-LX 1000Mbps or 1Gbps MM or SM fiber-optic SC or ST

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