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.
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.
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.
Lyle
Jeff LaCoursiere wrote:
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:
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
<[EMAIL PROTECTED]<[EMAIL PROTECTED]>
wrote:
On Fri, 3 Oct 2008, Eric Fort wrote:
yes, more than 300 meters (longer than copper based ethernet allows). Yes
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?
Looks like this is the thing then:
http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5362
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
Eric
On Thu, Oct 2, 2008 at 11:34 PM, Gordon Henderson <
[EMAIL PROTECTED] <[EMAIL PROTECTED]> <
[EMAIL PROTECTED] <[EMAIL PROTECTED]>>> wrote:
On Thu, 2 Oct 2008, Eric Fort wrote:
I presently need to connect a few channels of voice and data between
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?
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:
http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5261
From the UK site:
Or even:
http://www.blackbox.com/Catalog/Detail.aspx?cid=425,1423,1424&mid=4946
(same thing from the UK site:)
http://www.blackbox.co.uk/solutions/display.asp?cs=dvh&id=1&doc=lb300a-r2&tx=LAN&sx=Network%20Appliances
You need a pair, obviously...
Hm. US site is $305, UK ?253. Rip-off Britain again by the looks of
it....
As for inexpensive cards - OpenVox. Their E1 cards seem to work OK, but
if
using a LAN extender, then they're not neeed at all...
Gordon
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