Rogers vs Simpatico ----MUXXXXXX STATTTT DCN386

He is going to use the same test as in the spring, we will continue on with the theme of multiplexing we talking about stat mux and t1 mux we are going deeper into the world of multiplexing, picture Rogers Cable head office it has four satellites on the top of its roof that put out ur cable signal, today we are going to be talking about Rogers modems how their good and bad, when you watch TV you are watching a mux signal, when people make tv programs CBC CTV and DIC, people make program say CBC, if CBC would like to transmit this signal through our cable lines they must send it to Rogers so he can put that tv programs on our tv through our coaxial cables, it just so happens for high speed video like your tv, you require to send a signal that’s six million hz, got it, that’s a lot of hz CTV wants to make a program and dic must send it all at six million hz they send it using satellites, now Rogers, has put coaxial cable throughout Toronto 100s of kilo coaxial cables come in many grades, thick copper wire, by insulatiord surrounded by wire mesh very expensive. Coax has incredible bandwidth…means high range of frequency, what coax cable can handle? Coax cable can easily carry 600mil hz, accounts for the fact you can get approximately 100 tv stations,
How does this work? 100 programs coming one wire all at the same time.
How do they not interfere with each other, how come….multiplexing….

CBC 600mil hz Rogers feeds it into the multiplexor, each send it so

CBC 0-6 CTV 6-12 DIC 12-18

All simultaneously down you cable, because of the frequency range they will not interfere with each other, ur remote will change to the channel and filter out every thing

What is this to do with data com…nothing except Rogers cable have offered high speed internet connection what they have done is reserved 1 600million hz channel for you to use for data, they give you ur little modem attach it to your computer and ur computer has access to 6mil hz, think about it 70% people in the world are using ordinary modems and those modems can handle 4000hz and they can achieve speeds up to 50000bps think about this 500000bps out of 4000hz think about wat you can achieve with 6mill hz, cause ur using coax this is available to you, using QAM, rogers can provide ULTRA high bandwidth at ur disposable, but the shit thing you share the coaxial cable, Rogers ultimately will be a victim of their own success, the more customers the slower the service will become.

Simpatico 4000hz, from your phone line how is it possible to get high speed down this?

They attached tthis a local loop, twisted pair cable, when you talk on the phone its an analog signal, which travels down the local loop to the phone company, you use 4000hz, how is this possible, what happens? U will see very thin copper wire, but even thin phone line, very thin copper wire, is theoretically cable , not only 4000hz but up to 1 mill hz, think copper wire is capable of this so why do phones not use that…cause it’s not necessary, what happens when you get simpatico, a bell technicians disconnects you phone line from the existing phone line network, she reconnects you not to an ordinary voice switch but to a new switch a DSL switch the DSL switch sends an receives up to a million hz, what do you do? You replace your modem with another device which bell engineers call a DSL modem but its not a modem it’s a digital device, now attached to a dsl switch….the dsl switch takes the million hz and breaks that million hz into three different transmission bandwidths, dsl is a mux service just like Rogers, when they send tv and data signals, broken up to three discrete bandwidths,

0-4000hz ---- first band width is (dsl modem) the phone attaches to the dsl modem so for voice the old traditional bandwidth is maintained signals going down ur dsl modem it is reserved for additional phone services, why didn’t they increase this cause its pointless…..when the DSL switch notices the signals, it simply transmits those signals to the ordinary voice switch. You need filters to filter out everything over 4000hz,

4K-1mhz – the dsl modem reserves 4k and approximately, this is for out bound data
100,000hz – 1m hz – in coming data

Why did the DSL designers do this?
Download faster, they know the internet user submits a little, but you get a ton of data in return, this is called

Asynchronous
ADSL

Sychronous
SDSL – bandwidth split between incoming and outgoing….

DSL is still an emerging technology going to get faster faster, in the states they have this already sounds amazing but their a problems, Rogers has a problem and simpatico has a problem…..Distance….the higher a frequency the more power you can send it, it’s a factory of life, the higher the frequency the more power it needs, attenuation happens, if you are a happy simpatico user and you live right next store to you bell office you are getting incredible internet connection, if you have a sensitive, you can literally see every step you take from your phone company the frequency becomes less recognizable that there is a maximum limit your phone line can be, theirs a part of silicon valley, they cant get high speed DSL cause its far from the phone wire, 18,000 feet is the maximum distance, you can see why doesn’t bell install amplifiers, expense, Nobody is sharing ur phone line like Rogers, ur phone line is urs, because phone system was designed for lower power operation the frequency is high and attenuation level is high, distance is the enemy of the happy cable user, the DSL switch is so intelligent it can determine the level of operation and it will deliberately slow down if the DSL modem recognizes the signal is weak, which means slow speed.

Rogers is a three mark questions
DSL is a three mark questions,