Cabling LANs and WANs

Copper CablesTwisted-pair—Twisted-pair cables are

composed of one or more pairs of copper wires.

Coaxial—Coaxial cable has one center conductor of either solid or stranded copper wire.

Twisted-Pair Cable

The wire pairs are twisted for two reasons.First, cancellation.Second, filter out noise because the noise

signals cancel each other.Twisted

Pair

shielded

STP FTP

Unshielded

UTP

Shielded Twisted-Pair Cable STP

STP

Screened twisted-pair (ScTP) or foil twisted-pair (FTP)

FTP

Unshielded Twisted-Pair Cable UTPThe connector used on a UTP cable is called

a registered jack 45 (RJ-45) connector

UTP

Category 1 (CAT 1)—Used for telephone communications. Not suitable for transmitting data.

Category 2 (CAT 2)—Capable of transmitting data at speeds up to 4 Mbps.

Category 3 (CAT 3)—Used in 10BASET Ethernet networks. Can transmit data at speeds up to 10 Mbps.

Category 4 (CAT 4)—Used in Token Ring networks. Can transmit data at speeds up to 16 Mbps.

Category 5 (CAT 5)—Can transmit data at speeds up to 100 Mbps. Used in Fast Ethernet networks.

Category 5e (CAT 5e)—Used in networks running at speeds up to 1000 Mbps (1 Gbps). Used in Gigabit Ethernet (GigE) networks.

Category 6 (CAT 6)—The specification for CAT 6 is new, was released on February 3, 2003, and is currently available for installation and use. Used in Gigabit Ethernet (GigE) networks.

Coaxial Cable

Cabling LANs

The primary advantage and disadvantage comparison categories are as follows:

Cable lengthCostEase of installation

Ethernet in the Campus

UTP ImplementationA straight-through cable—A cable that

maintains the pin connection all the way through the cable. Thus, the wire connected to pin 1 is the same on both ends of the cable.

A crossover cable—A cable that crosses the critical pair to properly align, transmit, and receive signals on the device with line connections.

wires 1, 2, 3, and 6 are used for transmit (TD) and receive (RD) signals

Straight Through Cabling

EIA/TIA-568-A and EIA/TIA-568-B standards

Crossover Cablepin 1 at one RJ-45 end should connect to pin

3 at the other end. Pin 2 at one end should connect to pin 6 at the other end.

EIA/TIA-568-A and EIA/TIA-568-B standards

Use straight-through cables for the following cabling:Switch to routerSwitch to PC or serverHub to PC or server

Use crossover cables for the following cabling:Switch to switchSwitch to hubHub to hubRouter to routerPC to PCRouter to PC

Cabling the WAN

Serial connectionsDSL (digital subscriber line )Cable modem

RJ-11 connector

Setting Up Console ConnectionsThe cable used between a terminal and a

console port is a rollover cable with RJ-45 connectors.

Step 1: Cable the devices using a rollover cable. You likely need an RJ-45-to-DB-9 or an RJ-45-to-DB-25 adapter for your PC or terminal.

Step 2: Configure your terminal emulation application with the following common equipment (COM) port settings:9600 bps8 data bitsNo parity1 stop bitNo flow control.

THANKS !