ETHERNET

AN EXAMPLE OF BASEBAND.

WHAT IS BASEBAND? 1 DIGITAL SIGNAL AT A TIME GOING DOWN THE WIRE. WITH DIGITAL WE USE THE WHOLE PIPELINE.

CWDM

COURSE WAVE DIVISION MULTIPLEXING

MULTIPLEXING IS CHANGING THE SIGNAL. CWDM IS MULTIPLEXING DEFINED BY WAVELENGH INSTEAD OF FREQUENCY

WIRELESS NETWORK TOPOLOGY

THE DIFFERENT TYPES OF WIRELESS TOPOLOGIES ARE:

INFRASTRUCTURE WIRELESS

MESH

AD HOC

802.11n:

WHAT IS THE 802.11?

WHAT IS THE .11N?

802.11 DEFINES WIRELESS IN GENERAL TERMS

N MEANS:

THE THEREORETICALLY MAXIMUM THROUGHPUT IS:

600 MGbits

GROUP OF STATIONS THAT SHARE AN ACCESS POINT

SCSI-SMALL COMPUTER SYSTEM INTERFACE

ISCSI:

TECHNOLOGY NEEDED FOR STORAGE AREA NETWORK TO BE PUT ON A NETWORK.

USE ISCSI TO MAKE PRE-EXISTANT ETHERNET ARCHITECTURE WORK

BAND-

ONE TYPE OF COMMUNCIATIOIN THAT IS GOING ON, I.E. ONE WAVE, 0, 1’S.

1 BAND MEANS DIGITAL.

BROADBAND MEANS WE HAVE A BROAD SPECTRUM OF DIFFERENT BANDS THAT RAE GOING OVER A COMMUCNATION CHANNEL.

BANDS- ARE DIFFERENT FREQUENCIES. IN THIS CASE, GOING OVER A COMMUNCIATON CHANNELL

WHAT DO CATEGORIES DO?

5 6 6E

INCREASE BANDWIDTH.

IMPROVING THE BANDWIDTH, THROUGH TWISTS, ELIMINATING INTERFERENCE.

CAT 6 MAXIMUM SUPPORTED THERORETICAL BANDWIDTH IS 10 GIG.

CAT 5- 1 GIG

IN GENERAL, THE WORK AT THE PHYSICAL LAYER OF THE OSI MODEL.

THERE ARE DIFFERENT 802.11 STANDARDS

A B G N AC…ARE THROUGHPUTS THEREORETICALLY

SPECIAL SIGNAL THAT CONTAINS INFORMATION THAT A WIRESLSS NODE REQUIRED IN ORDER TO ASSOCIATE ITSELF TO AN ACCESS POINT.

THE ACCESS POINT SENDS OUT A BEACON FRAME. LIKE A LIGHT ON A TOWER

DEFLECTION-SIGNAL BOUNCES OFF AND STAYS TOGEATHER

DIFFRACTION- IS LIKE A PRISM-SPLITS THE LIGHT

COMPUTER TERMS- CAUSES THE WIRELESS SIGNAL TO SPLIT INTO SECONDARY WAVES

OBSTRUCTION- HITTING A METAL OBJECT—

SIGNAL PROPOGATION PHENONEMAN

WHERE AN INCOMING NETWORK INTERFACE ENTERS THE BUILDING AND CONNECTS WITH THE BUILDINGS BACKBONE CABELING. (LOCAL CABLING)

ALSO CALLED POP-POINT OF PRESENTS

THE NUMBER OF TIMES A WAVE AMPLITUDE CYCLES FROM THE STARTING POINT THROUGH ITS HIGHEST AMPLITUDE, LOWEST AMPLITUDE AND BACK TO THE STARTING POINT FOR A FIXED PERIOD OF TIME.

FULL CYCLE OF WAVE OVER TIME

HZ- 1 CYCLE/SECOND

GZ-BILLION/SECOND

THE METHOD OF TRANSMISSION THAT ALLOWS SIGNAL TO TRAVEL BOTH DIRECTIONS, BUT IN ONLY ONE DIRECTION AT A TIME.

SIMPLEX- 1 DIRECTION ONLY

FULL DUPLEX- BOTH AT SAME TIME

WHAT DO WE NEED TO KNOW?

WHEN TERMINATING AN END TO AN END OF THE CABLE, WE DONT WANT TO EXPOSE MORE THEN 1 INCH OF CABLE TO ENSURE MINIMUM CROSSTALK. KEEP IT TWISTED.

WIRELESSLY- HOW FAR CAN THE STATIONS BE AWAY:

300 FEET 100 METERS

THEREORETICALLY 75 METERS

MODULATES DIGITAL TO ANALOG

DEMODULATES ANALOG TO DIGITAL

MODULATE/DEMODULATE-MODEM

VOICE/SOUND

2 TYPES:

SINGLE MODE-LONG DISTANCE

MULTI MODE-SHORT DISTANCE

62 MICRONS

ELECTRTICAL MAGNETIC INTERFERENCE

KEEP 3 FEET AWAY

FREQUENCY DIVISION MULTIPLEXING:

WHAT PHONE COMPANIES USE

DSL, EVERYBODY GETS A FREQUENCY TO WORK WITH.

1 GIG

MINIMUM SUPPORT GIG ETHERNET

THEREORETICALLY

BEFORE WE TALKED ABOUT BASEBAND.

ETHERNET EXISTS ON THE LAYER 2 OF THE OSI MODEL

GENERAL TERM

FORM OF TRANSMISSON THAT ALLOWS MULTIPLE SIGNALS TO TRAVEL SIMULTANEOUSLY OVER 1 MEDIUM

TO GET 1000BASE T (CAT5E)

HAVE 4 PAIRS OF WIRES, USE ALL

1000 MG BITS PER SECOND YOU NEED 4 WIRES

CAN YOU USE POWER OF ETHERNET AND 1000MG BITS ON CAT5E AT THE SAME TIME?

NO!

WHY? NEED ALL 4 WIRES