CT1304 LAN LABRehab AlFallaj

OBJECTIVES:

To learn the difference between UTP and STP. To learn the categories of the UTP. To implement straight-through UTP. To implement Crossover UTP.

TWISTED PAIR

UNSHIELDED TWISTED PAIR (UTP)

The UTP has several categories. These categories define the quality level of the cable. The categories are:

Category 1: This is a common telephone cable.

Category 2: CAT2 cable was first networking UTP but is now considered obsolete. It supports data rate up to 1Mbps.

Category 3: CAT3 is seldom used outside an IBM environment and has been replaced by CAT5. CAT3 is used in 10Mbps Ethernet LANs and 4Mbps Token Ring LANs.

UNSHIELDED TWISTED PAIR (UTP) Category 4: CAT4 has been specified for up to 20Mbps and is

specific for 16Mbps Token Ring LANs.

Category 5: CAT5 has been specified for data rates up to 100Mbps. This is the preferred cabling installation for Ethernet and Token Ring.

Category 6: CAT6 has been specified for data rates up to 1000Mbps (1 Gbps).

Category 7 : CAT7 has been specified for data rates up to 10 Gbps.

UNSHIELDED TWISTED PAIR (UTP)

EIA/TIA-568A/B compliant refers to which of the four pairs in the UTP cable are designated as transmit, and which are designated as receive. Use the following as a guide:

EIA/TIA-568A: Devices transmit over pair 3, and receive over pair 2.

EIA/TIA-568B: Devices transmit over pair 2, and receive over pair 3.

RJ-45 TERMINATION — EIA/TIA-568A

RJ-45 TERMINATION — EIA/TIA-568B

UTP IMPLEMENTATION: STRAIGHT-THROUGH

UTP IMPLEMENTATION: CROSSOVER

UTP IMPLEMENTATION: STRAIGHT-THROUGH

UTP IMPLEMENTATION: STRAIGHT-THROUGH

UTP IMPLEMENTATION: CROSSOVER

UTP IMPLEMENTATION: CROSSOVER

STRAIGHT-THROUGH VS. CROSSOVER

Use straight-through cables for the following cabling: Switch to Router. Switch to Server (PC). Hub to Server (PC).

Use crossover cables for the following cabling: Switch to Switch. Switch to Hub. Hub to Hub. Router to Router. PC to PC

UNSHIELDED TWISTED PAIR (UTP)

UTP is susceptible to crosstalk. Shielding is used to reduce crosstalk.

SHIELDED TWISTED PAIR (STP)

STP contains a metal shielding fully encircling the twisted pairs to reduce the ElectroMagnetic Interference (EMI).

EMI is produced by sources such as motors, generators, or power lines.

SHIELDED TWISTED PAIR (STP)

The shielding may be either: A metal foil (called Foil Twisted Pair, or FTP). A fine mesh of braided metal (called Screened

Twisted Pair, or ScTP). STP using the foil shield is thinner, easier to

install, and cheaper. Advantages of STP over UTP:

STP is less susceptible to electrical interference. STP supports higher transmission rate over

longer distance than UTP.

REGISTERED JACK – 45 (RJ-45)

Twisted-pair uses RJ-45 connector to connect a computer.

The RJ-45 is slightly larger than the RJ-11 telephone connector. In addition, RJ-45 houses eight cable connections, while the RJ-11 only houses four.

REGISTERED JACK – 45 (RJ-45)

CRIMPING TOOL

Cut Strip Crimp

ADDITIONAL RESOURCES:

Crossover and Straight Through Cables http://

www.youtube.com/watch?v=whE147jUi_Y

Straight-through and Cross-over Cable theory http://

www.youtube.com/watch?v=65MxG6aGYzk

How to make CAT5 Ethernet Cable - Straight Through & Crossover

http://www.youtube.com/watch?v=Uw8FSXx4dnU