Network Devices Sritrusta Sukaridhoto Network Devices Media on

Network Devices Sritrusta Sukaridhoto

Network Devices

Media on PC n n Ethernet Modem PC Card (WLAN) DVB

Ethernet - Architecture

Ethernet – IEEE 802. 3 n n 10 Base 5 – Thick wire coaxial 10 Base 2 – thin wire coaxial / cheaper net 10 Base. T – Twisted Pair 10 Base. F – Fiber Optics 100 Base. T – Fast Ethernet

Ethernet – 10 Base 5

Ethernet – 10 Base 2

Ethernet – 10 Base. T

NIC Connector type n Coaxial Cable ¡ n Twisted Pair Cable ¡ n Bayonet Nut Connector (BNC) RJ-45 (8 wire) Fiber Optics ¡ SMA connectors

Modem n n Allows modems of different vendors to operate together Define How modems operate: ¡ ¡ ¡ Modulation techniques Data compression technique Error detection strategy

Modem – Analog vs Digital n Analog ¡ ¡ n Infinite number of levels Conform to voice pattern Times from highest to lowest and back to the highest point in one second is the frequency Can be transmitted over long distance Digital ¡ ¡ ¡ Only two levels (high and low) Conforms to how computers operate Cannot transmitted over long distance

Modem - Connection

Modem – Internal/External

PC Card – WLAN (802. 11) n Bypassing last mile

PC Card (WLAN) - 1

PC Card (WLAN) - 2

PC Card (WLAN) – Indoor Antena

DVB – DVB/IP Tech n The Digital Video Broadcast over Internet Protocol (DVB/IP) system is functionally an IP-over-Ethernet simplex satellite service that incorporates frame-relay type traffic management. At its core, DVB is a modemon-a-chip, plus an intelligent multiplexer. The antenna is typically a CATV dish, 2. 4 - 3. 8 meters in diameter (for C-band), or 0. 6 -1. 8 meters (for Ku-band).

DVB – DVB/IP Routing

DVB - Adaptability

DVB – DVB Card

Media n Wired ¡ ¡ ¡ n Twisted Pair – UTP Coaxial Fiber Wireless ¡ ¡ Microwave Satellite

Twisted Pair n Two wired wrapped in a twisted fashion ¡ ¡ n n Designed to reduce cross-talk due inductance Still subject to interference from stray signal Primarily used for local loop connections and LANs Comparatively narrow bandwidth

UTP – Unshielded Twisted Pair n Pair 1 ¡ ¡ n Pair 2 ¡ ¡ n ¡ White/Green Pair 4 ¡ ¡ n White/Orange Pair 3 ¡ n White/blue Blue White/Brown RJ 45 Connector

UTP – Straight Cable Wo/O Wg/B Wb/G Wbr/Br

UTP – Cross Cable Wg/G Wo/B Wb/O Wbr/Br

UTP - Category Maximum Data Rate Usual Application CAT 1 Less than 1 Mbps Analog voice (POTS), Integrated Services Digital Network Basic Rate Interface in ISDN Doorbell wiring CAT 2 4 Mbps Mainly used in the IBM Cabling System for token ring networks CAT 3 16 Mbps Voice and data on 10 BASE-T Ethernet CAT 4 20 Mbps Used in 16 Mbps Token Ring Otherwise not used much CAT 5 100 Mbps TPDDI (100 BASE-T or Fast Ethernet) 1000 Mbps (4 pair) 155 Mbps ATM Gigabit Ethernet CAT 5 E 100 Mbps TPDDI (100 BASE-T or Fast Ethernet) 155 Mbps ATM CAT 6 200 -250 MHz Super-fast Broadband Applications.

Coaxial n Center lead conducts the signal ¡ n n Protected by insulation and braded wire Used mostly for television and connections to antenna Larger Bandwidth but large in size

Fiber Optical n n n Signal transmitted by photos rather than electrons Dramatically higher bandwidth Used mostly for backbone communication connections, very high speed LANs and fast network connections

Microwave – Antenna (1) n n Omni 2. 4 GHz 8 d. Bi

Microwave – Antenna (2) n n Sectoral 14 d. Bi 180 deg

Microwave – Antenna (3) n n Sectoral 17 d. Bi 90 deg

Microwave – Antenna (4) n n Direct (Grid) 2. 4 GHz 24 d. B

Microwave – Power AMP

Satellite - Broadband

Media Comparison

Multiplexer n n HUB Switch Bridge Router

Hub versus Switch n Hub provide connection to all ports (i. e. in one port and out all other ports). ¡ ¡ n Passive hub – no signal regeneration Active hub – provide signal regeneration Switch direct the message from appropriate port (directs a message from the input port to the desired output port). ¡ More expensive but better bandwidth utilization

Hub versus Switch

LAN Hub device

Hub

LAN Switch device

Switch

Bridge – Access Point (WLAN)

Router n n n Connecting different segment Have different interfaces (Ethernet, WAN-Serial, Fiber, etc) Table Routing

Router