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T1 is NOT DSL. Most T1 links you purchase now are brought into your
building with a type of DSL conversion to extend the distance between
repeaters/amplifiers. T1 is purely a digital signal. DSL converts the
ones and zeros to audio(multiple tones to provide multi channels of
data). A simple analogy is comparing a T1 to DSL as a serial port to a
modem.<br>
<br>
Back in the old days before fiber, copper T1's between CO's had their
repeaters placed aproximately 1 mile apart. Best case going T1 port to
T1 port, I would not expect this to work reliably at distances greater
than one mile or 1.6 km but that does depend on the quality of the
cable also.<br>
<br>
But in my mind, I would be seriously concerned about lightening
protection. I have been around telco's and privately owned facilities
for a long time and see lightening to be a very serious issue in this
scenerio. I have seen short distance copper replaced by fiber because
of issues over time with lightening damage despite having proper telco
grade protection.<br>
<br>
Lyle<br>
<br>
Jeff LaCoursiere wrote:
<blockquote cite="mid:20081003053124.C55890@hera.charnocks.net"
type="cite">
<pre wrap="">I would say miles. DSL limits for equiv bandwidth is around 3 miles if I
recall correctly.
j
On Fri, 3 Oct 2008, Eric Fort wrote:
</pre>
<blockquote type="cite">
<pre wrap="">without any other hardware than 2 bare ass pci based t1/e1 cards wired back
to back how far can one go between them? additional hardware defeats the
purpose.
Eric
On Fri, Oct 3, 2008 at 3:01 AM, Gordon Henderson
<<a class="moz-txt-link-abbreviated" href="mailto:gordon+asterisk@drogon.net">gordon+asterisk@drogon.net</a><a class="moz-txt-link-rfc2396E" href="mailto:gordon%2Basterisk@drogon.net"><gordon%2Basterisk@drogon.net></a>
</pre>
<blockquote type="cite">
<pre wrap="">wrote:
</pre>
</blockquote>
<blockquote type="cite">
<pre wrap="">On Fri, 3 Oct 2008, Eric Fort wrote:
yes, more than 300 meters (longer than copper based ethernet allows). Yes
</pre>
<blockquote type="cite">
<pre wrap="">to E1, as I understand it, it's just a config change on many cards anyway.
I'm specificly looking at pci based t1/e1 cards because I'm finding single
port cards on ebay going for 100-200 usd. in some cases I may want to
drive
a channel bank at the far end, thus t1/e1. anyone have experience on how
far these pci based cards will drive when wired back to back?
</pre>
</blockquote>
<pre wrap="">Looks like this is the thing then:
<a class="moz-txt-link-freetext" href="http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5362">http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5362</a>
Just over $1000 a pair...
couple that with an OpenVox PRI card at one end, channel bank at the other,
and off you go...
Gordon
</pre>
<blockquote type="cite">
<pre wrap="">Eric
On Thu, Oct 2, 2008 at 11:34 PM, Gordon Henderson <
<a class="moz-txt-link-abbreviated" href="mailto:gordon+asterisk@drogon.net">gordon+asterisk@drogon.net</a> <a class="moz-txt-link-rfc2396E" href="mailto:gordon%2Basterisk@drogon.net"><gordon%2Basterisk@drogon.net></a> <
<a class="moz-txt-link-abbreviated" href="mailto:gordon%2Basterisk@drogon.net">gordon%2Basterisk@drogon.net</a> <a class="moz-txt-link-rfc2396E" href="mailto:gordon%252Basterisk@drogon.net"><gordon%252Basterisk@drogon.net></a>>> wrote:
On Thu, 2 Oct 2008, Eric Fort wrote:
</pre>
<blockquote type="cite">
<pre wrap=""> I presently need to connect a few channels of voice and data between
</pre>
<blockquote type="cite">
<pre wrap="">multiple locations where I own the copper between them. Each location
exceeds 300M from any other location. I'm thinking of generating T1's
and
running those between locations. If I use PC based cards wired back to
back
(I can do that, right?) what kind of distance can I expect to be able to
span without needing repeaters? What inexpensive cards can you
recommend
for use with asterisk? I'm considering either digium or sangoma. Would
I
get any better performance if I used a sync-serial card connected to a
separate csu/dsu?
</pre>
</blockquote>
<pre wrap="">300 metres, right? (not 300 miles?)
Why stop at T1? Go for E1 :) with the right kit at each end you ought to
be
able to get 2Mb/sec or more. (distance depending)
Personally, I'd go for a technology that gave me Ethernet at each end -
then it makes it much easier to mix voice and data - But using something
like a sync. modem and line driver then you need a media converter of
some
sorts at each end which might bump up the cost - at the savings of the E1
card in the PC though. Last time I had bare copper to play with (a BT
EPS8
circuit) I had a 2Mb modem at each end going into a Cisco 2600 which was
running CHDLC over the link and acting as nothing more than a dumb media
converter to give me Ethernet at each end. This was 6 years ago though.
Ah, Looks like the technology has improved somewhat:
<a class="moz-txt-link-freetext" href="http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5261">http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5261</a>