You can’t push a T1 through a load-coil which are normally placed every mile on copper. Typically the telco would cut the load-coil out of the 2 T1 pairs and install a repeater to push the T1 the next mile. That is with a traditional T1 circuit. Most T1s these days are 2 wire HDSL which has a max of about 12k feet. So for 6 miles you’ll need 3 repeaters in the span *if* you have good copper. From: NANOG <nanog-bounces@nanog.org> on behalf of Nick Bogle <nick@bogle.se> Date: Wednesday, December 12, 2018 at 10:00 PM To: Dan Hollis <goemon@sasami.anime.net> Cc: "nanog@nanog.org" <nanog@nanog.org> Subject: Re: Extending network over a dry pair The driving distance is 4 miles, we are leasing it from CenturyLink whose headend maybe adds a mile or less, it's on the route and about half way through. I made it 6 miles to be safe. We currently can pull a full 1.5Mbps off of that T1 we run there so perhaps CenturyLink is repeating at their CO and/or along the route? On Wed, Dec 12, 2018 at 6:32 PM Dan Hollis <goemon@sasami.anime.net<mailto:goemon@sasami.anime.net>> wrote: I doubt he will get >1.5mbps with those over a 6 mile long connection. I did a quick check and flowpoint 2200s seem to max out at 192kbps at 3 miles. -Dan On Wed, 12 Dec 2018, Tim Pozar wrote:
For dry pairs, I have used Flowpoint SDSL modems (see attached). I picked these up for a sawbuck.
Tim
On 12/12/18 5:00 PM, Dan Hollis wrote:
On Wed, 12 Dec 2018, Nick Bogle wrote:
A quick question for you guys;
If you had a single dry pair (pair of copper wires originally for phones) to a remote site that was around 6 miles away, what would you use? We currently are just extending a T1 line to this site, but 1.5Mbps isn't cutting it anymore. Unfortunately it's a research site on a federally protected wildlife preserve so we can't run any new infrastructure (fiber etc) and it isn't in a geographical place where point to point wireless is practical. We were thinking there is some sort of network extender that uses some form of DSL for higher bandwidth capacity.
Any suggestions?
If this is telco provided dry pair then the distance is probably longer than 6 miles as the endpoints are probably tied together through a telco CO.
I have not heard of any equipment which will work over a 6 mile pair any faster than you're getting with T1.
You might consider setting up wireless repeaters to bridge where there is no direct LOS. Look at what the hamwan guys have done. http://hamwan.org/
-Dan