33..Transmission MediaTransmission Media- Wireless-Cabling System

• Ad hoc topology: Connects two or more wireless computers communicating with each other only

• Infrastructure network: Connects wireless computers communicating with a network access point that provides access to a standard cabled network

Wireless TopologiesWireless Topologies

IEEE 802.11 StandardsIEEE 802.11 Standards

• IEEE 802.11a. Speeds of 1 to 2 Mbps• IEEE 802.11b. Speeds of 5.5 to 11

Mbps

Cabling SystemCabling System1. Coaxial cable2. Fiber optic 3. Twisted pair

Thick netThick net

Thin netThin net

A BNC Connector with a T A BNC Connector with a T AttachedAttached

Coaxial Cable TypesCoaxial Cable TypesThick

RG-8ThinRG-58

Thicknessاو السمكالكثافه

0.405 inch0.195 inch

Distanceبعد اقصى اوالمدى

(500m)(185m)

Type of connector

(AUI)(BNC)

Coaxial cableCoaxial cable

Fiber Optic CableFiber Optic Cable

Fiber Optic ConnectorsFiber Optic Connectors

Fiber Optic Cable TypesFiber Optic Cable Types• Single mode: Used for wide area

networks (WANs) and other long cable runs

• Multimode: Used for local area networks (LANs) and short cable runs

بين )) الضوئية األلياف عبر البيانات ببنقل خاصالمدن مثل كبيرة الطبيه مسافات واالعمال ))

Fiber Distributed Data Fiber Distributed Data Interface (FDDI) Interface (FDDI) CharacteristicsCharacteristics

• First commercial 100-Mbps fiber optic protocol

• Uses the token passing MAC mechanism

• Supports both singlemode and multimode cable

Twisted-Pair CableTwisted-Pair Cable

• Twisted Pair

STP

UTP

الداخل من ببالستك محمي

من ببالستك غيرمحمي الداخل

UTP Crimpling ToolsUTP Crimpling Tools

الكابل } • النوع UTPشكل حسب ألوانه وترتيب { المطلوب

UTP

Crimpling UTP CablesCrimpling UTP Cables

UTP StandardsUTP Standards

UTP TypeUTP TypeGRDEApplication

Category 310-Mbps, 100Base-T4

Category 416-Mbps

Category 5100Base-TX,100mbps

Higher cat51000mbps

Straight cableStraight cable

1/WO

5/WB

3/WG

6/G7/WBR

8/BR

2/o

4/B

Used with (PC,SW) ,(SW,R)

Crossover cableCrossover cable

6

2

3

1

Used With (PC,PC),(R,R),(SW,SW)

Rollover cableRollover cable

With (PC, Router)

Summary of UTPSummary of UTP

االلوان الكابل بين ترتيب للربط1 Forward

(straight)PC&&SWمتماثل

2 (Cross over)( 3مع 1تبادل( مع 2و(6)

(pc,pc) .(R,R), (sw,sw)

3 Roll over

االلوان (Pc,R)نعكس