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Mailing List Logs for ShadowRN

Message no. 1
From: Asymmetric all@******.net
Subject: some random sat stats
Date: Tue, 07 Dec 1999 00:41:34 -0500
I just got some propaganda mailed to me from PSINet, which included a nice
two page spread of their worldwide network backbone.. and there are only
three sat links on the whole thing.

Breakdown of major longhaul connections for the USA:

Three TransPacific OC3 to OC12 connections.
Porland OR - Tokyo
SanFran CA - Tokyo
San Louis Obispo CA - Tokyo by way of Honolulu

Three transpacific OC96's (OC192 compatable, they call it Dark Fiber)
SanFran CA - Tokyo (x2)
Porland OR - Tokyo

One Transpacific DS1 to OC12
SanFran CA - Hong Kong

Two Transatlantic OC3 to OC12 connections.
New York NY - London (x2)

One Transatlantic DS1 to OC12
Washington DC - Amsterdam

--sats--
Three satellite links
Los Angeles CA - Santiago Chile
Hefndan ?? - Panama
Hefndan ?? - Belo (something) Brazil

They don't mention the bandwidth of the sat links, but I -really- doubt
they're anywhere close to the bandwidth of an OC12..

Here's a breakdown of those various links and bandwidths.

(OC stands for Optical Channel.. i.e., Fiber. I guess you were right Tz. ;)
DS0: 64kilobits/sec
DS1 (T1): 1.54megabits/sec
OC3 (Not T3. A T3 is a DS3.): 155.52megabits/sec
OC12: 622.080megabits/sec
OC48: 2.488gigabits/sec
OC96: 4.976gigabits/sec
OC192: 10gigabits/sec

To nitpick once more and set people straight, even though it's pointless
since industry has adopted the term.. there is really no such thing as a
"fractional T1." All DS circuits are just multiple channel DS0's.. ;)


-A

"There comes a time when the operation of a machine becomes so odious,
makes you so sick at heart, that you can't take part; not even tacitly take
part, and you have to throw yourself on all the gears and all the levers
and you have to make it stop."

-Mario Savio, founder of the free speech movement.

Commandment XI: Thou shalt not inflict upon me thy useless prattlings, for
I thy God am a busy God.
-Joe Thompsonn
Message no. 2
From: Mockingbird mockingbird@*********.com
Subject: some random sat stats
Date: Tue, 7 Dec 1999 08:09:38 -0600
----- Original Message -----
From: Asymmetric <all@******.net>
To: <shadowrn@*********.org>
Sent: Monday, December 06, 1999 11:41 PM
Subject: some random sat stats


<snip>
> To nitpick once more and set people straight, even though it's
pointless
> since industry has adopted the term.. there is really no such thing
as a
> "fractional T1." All DS circuits are just multiple channel DS0's..
;)
>

Um,
There is such a thing as a fractal T1. From
http://whatis.com/fractiot.htm


A fractional T-1 or T-3 line is a T-1 or T-3 digital phone line in the
North American T-carrier system that is leased to a customer at a
fraction of its data-carrying capacity and at a correspondingly lower
cost. A T-1 line contains 24 channels, each with a data transfer
capacity of 64 Kbps. The customer can rent any number of the 24
channels. The transmission method and speed of transfer remain the
same. Overhead bits and framing are still used, but the unrented
channels simply contain no data.

Or in short form, a T-1 line is a specific (24) multiple of DS0
channels. A fractal T-1 is less than 24 DS0 channels being used.

Mockingbird
Message no. 3
From: Ojaste,James [NCR] James.Ojaste@**.GC.CA
Subject: some random sat stats
Date: Tue, 7 Dec 1999 14:00:22 -0500
> From: Mockingbird [mailto:mockingbird@*********.com]
> Sent: December 7, 1999 09:10
>
> <snip>
> > To nitpick once more and set people straight, even though it's
> pointless
> > since industry has adopted the term.. there is really no such thing
> as a
> > "fractional T1." All DS circuits are just multiple channel DS0's..
[snip]
> There is such a thing as a fractal T1. From

Cool! With fractal data transmission you could transmit an infinite
amount of data in a finite spacetime...

I don't think we're quite there yet... ;-)

> A fractional T-1 or T-3 line is a T-1 or T-3 digital phone line in the
> North American T-carrier system that is leased to a customer at a
> fraction of its data-carrying capacity and at a correspondingly lower
> cost. A T-1 line contains 24 channels, each with a data transfer

Well, you're both right. You can't lay a Fractional T1 line from one
point to another, but you can lay a T1 line and then only use a
fraction of it. Just a matter of physical & logical terminology
overlapping.

James Ojaste
Message no. 4
From: paul collins paulcollins@*******.com
Subject: some random sat stats
Date: Wed, 8 Dec 1999 21:26:40 +1100
>
> Or in short form, a T-1 line is a specific (24) multiple of DS0
> channels. A fractal T-1 is less than 24 DS0 channels being used.
>
> Mockingbird
>
For other parts of the world a T-1 would be 32 channels. In other words,
American t-1's are 1.5 meg, while the rest of the world are 2 meg.

Trivia supreme :o)

Paul in Aust

Further Reading

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Disclaimer

These messages were posted a long time ago on a mailing list far, far away. The copyright to their contents probably lies with the original authors of the individual messages, but since they were published in an electronic forum that anyone could subscribe to, and the logs were available to subscribers and most likely non-subscribers as well, it's felt that re-publishing them here is a kind of public service.

Thwap!