Date: Mon, 24 Apr 2000 18:06:58 -0700 From: Richard Furda <rfurda@best.ca> To: Ryan Thompson <ryan@sasknow.com> Cc: freebsd-net@freebsd.org Subject: Re: Max T1. Throughput? Message-ID: <4.2.0.58.20000424175005.0095a590@best.ca> In-Reply-To: <Pine.BSF.4.21.0004241805280.42785-100000@ren.sasknow.com>
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Hello,
At 06:06 PM 4/24/00 -0600, you wrote:
>There seems to be some confusion around our region on what the maximum
>throughput of a T1 is.
A T1 digital stream consists of 24 64kbps multiplexed time slots which come
to a total of 1.536mbps, extra 8kbps is for framing. Thus, possible maximum
throughput of a T1'd be: 192Kbytes/sec.
>(Actually, we are on a 1.544Mbps leased SDSL line
>from a local ISP. The package was sold to us as a burstable T1).
A 'burstable' T1 IMHO implies that it can burst up to 1.544 but
not steady 1.544mbps.
>Is SDSL the key, here? Perhaps I took "Synchronous" in the wrong
>way. Does "Synchronous" imply UP = DOWN = 1.54Mbps / 2?
Symetric means, both up/down, or 'both ways' if you will. Cable
modem ISPs usually provide asymmetric access, thus high download
rate, slow upload rate.
Rich
---
Richard Furda
PGP public key: http://www.best.ca/rfurda.pkr
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<html>
<br>
<font size=3><x-tab> </x-tab>Hello,<br>
<br>
At 06:06 PM 4/24/00 -0600, you wrote:<br>
<blockquote type=cite cite>There seems to be some confusion around our
region on what the maximum<br>
throughput of a T1 is. </font></blockquote><br>
A T1 digital stream consists of 24 64kbps multiplexed time slots which
come <br>
to a total of 1.536mbps, extra 8kbps is for framing. Thus, possible
maximum<br>
throughput of a T1'd be: 192Kbytes/sec.<br>
<br>
<font size=3><blockquote type=cite cite>(Actually, we are on a 1.544Mbps
leased SDSL line<br>
from a local ISP. The package was sold to us as a burstable
T1).</blockquote><br>
A 'burstable' T1 IMHO implies that it can burst up to 1.544 but<br>
not steady 1.544mbps. <br>
<br>
<blockquote type=cite cite>Is SDSL the key, here? Perhaps I took
"Synchronous" in the wrong<br>
way. Does "Synchronous" imply UP = DOWN = 1.54Mbps /
2?</blockquote><br>
Symetric means, both up/down, or 'both ways' if you will. Cable<br>
modem ISPs usually provide asymmetric access, thus high download<br>
rate, slow upload rate.<br>
<br>
<x-tab> </x-tab>Rich<br>
<br>
</font><br>
<br>
<br>
<div>---</div>
<div>Richard
Furda<x-tab> </x-tab><x-tab> </x-tab></div>
PGP public key:
<a href="http://www.best.ca/rfurda.pkr" EUDORA=AUTOURL>http://www.best.ca/rfurda.pkr</a>;
</html>
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