2 of 2: Questions about "The Case of the Missing Upstream" . . .
drowd
Texas
ok,
here is a question that has been bugging me for quite some time, and no one including my networking prof (see question 1 of 2) could really answer it for me. again, i will start out with some assumptions:
Assumption 1) The major 3 or 5 or however many MAJOR players (and i mean the really big dogs that can essentially say that they OWN the internet) control the majority of the backbone. if i remember correctly this is like AT&T, SWBell, and some others. anyway, these folks sell bundles of T1's and T3's to the local telco companies. So, if your local internet provider is Time Warner cable or Verizon DSL, you have that access because those two companies are leasing bundles of T1's and T3's from the major nationwide players.
Assumption 2) T1, E1, T3, E3, OC48, etc, etc all BY DEFINITION are synchronous connections. a T1 by definition is 1.544 Mbps up and 1.544 Mbps down. a T3 by definition is 44 Mbps up/44 Mbps down. I realize my numbers might be a little off, but the important thing to catch here is that, as far as bandwidth is concerned, all of these large scale jacks into the internet are SYNCHRONOUS connections. (my prof actually tried to argue this assumption, but i will go into that later).
Assumption 3) on the smaller scale, consumer and small business, DSL and Cable are the wide spread standard. but more important than the number of people that have these connections is the types of connections these are. For the most part, the vast majority (i would say 98 percent of the dsl and cable population) of people have ASYNCHRONOUS connections. the typical DSL connection is about 384Kbps/1.5Mbps and Cable is either the same or even more downstream at 384Kbps/3.1Mbps. and yes, i do realize that synchronous connections do exist, but this is only breaking even, and the vast majority of these connections are still asynchronous connections.
So, now to the problem. What I want to know, is where in gods green earth is all of that upstream? are the Telco companies just hanging on to it? i dont understand where all the upstream goes between the local providers and us. If local telco is receiving massive synchronous connections, but selling the consumer asynchronous connections, it must be somewhere. perhaps its a marketing ploy, but i have never been able to get a straight answer about this.
now, my professors response to this, was that T1's and T3's were not a simultaneous 1.5 up and 1.5 down, but that the max up at one time was 1.5 and the max down at one time is 1.5, but the max you can be BOTH sending AND recieving at one time was 768 Kbps or .75 Mbps. this satisfied me at first, but as i thought about it, i KNOW that is wrong information. at my intern facility, we have two T1's bundled together, and we can physically monitor the data being sent out. we send and recieve images from our houston campus all the time, and we have the combined bandwidth of 3 Mbps up and 3 Mbps down. In addition, i have a friend that has a wireless tower in his back yard and he gets a wireless T1 to his house, and he can be sending and receiving at a rate of 1.5 Mbps at THE SAME TIME. So i am fairly sure that my assumption number 2 holds true.
anyway, if anyone wants to answer this question, i would be greatly obliged. i have been wondering this for quite some time, and i REALLY want to know: where is all that bandwidth?!
(mainly cuz i want some
)
thanks for the help in advance . . .
here is a question that has been bugging me for quite some time, and no one including my networking prof (see question 1 of 2) could really answer it for me. again, i will start out with some assumptions:
Assumption 1) The major 3 or 5 or however many MAJOR players (and i mean the really big dogs that can essentially say that they OWN the internet) control the majority of the backbone. if i remember correctly this is like AT&T, SWBell, and some others. anyway, these folks sell bundles of T1's and T3's to the local telco companies. So, if your local internet provider is Time Warner cable or Verizon DSL, you have that access because those two companies are leasing bundles of T1's and T3's from the major nationwide players.
Assumption 2) T1, E1, T3, E3, OC48, etc, etc all BY DEFINITION are synchronous connections. a T1 by definition is 1.544 Mbps up and 1.544 Mbps down. a T3 by definition is 44 Mbps up/44 Mbps down. I realize my numbers might be a little off, but the important thing to catch here is that, as far as bandwidth is concerned, all of these large scale jacks into the internet are SYNCHRONOUS connections. (my prof actually tried to argue this assumption, but i will go into that later).
Assumption 3) on the smaller scale, consumer and small business, DSL and Cable are the wide spread standard. but more important than the number of people that have these connections is the types of connections these are. For the most part, the vast majority (i would say 98 percent of the dsl and cable population) of people have ASYNCHRONOUS connections. the typical DSL connection is about 384Kbps/1.5Mbps and Cable is either the same or even more downstream at 384Kbps/3.1Mbps. and yes, i do realize that synchronous connections do exist, but this is only breaking even, and the vast majority of these connections are still asynchronous connections.
So, now to the problem. What I want to know, is where in gods green earth is all of that upstream? are the Telco companies just hanging on to it? i dont understand where all the upstream goes between the local providers and us. If local telco is receiving massive synchronous connections, but selling the consumer asynchronous connections, it must be somewhere. perhaps its a marketing ploy, but i have never been able to get a straight answer about this.
now, my professors response to this, was that T1's and T3's were not a simultaneous 1.5 up and 1.5 down, but that the max up at one time was 1.5 and the max down at one time is 1.5, but the max you can be BOTH sending AND recieving at one time was 768 Kbps or .75 Mbps. this satisfied me at first, but as i thought about it, i KNOW that is wrong information. at my intern facility, we have two T1's bundled together, and we can physically monitor the data being sent out. we send and recieve images from our houston campus all the time, and we have the combined bandwidth of 3 Mbps up and 3 Mbps down. In addition, i have a friend that has a wireless tower in his back yard and he gets a wireless T1 to his house, and he can be sending and receiving at a rate of 1.5 Mbps at THE SAME TIME. So i am fairly sure that my assumption number 2 holds true.
anyway, if anyone wants to answer this question, i would be greatly obliged. i have been wondering this for quite some time, and i REALLY want to know: where is all that bandwidth?!
(mainly cuz i want some
)thanks for the help in advance
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