Extending network over a dry pair

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?

Look for an SHDSL Ethernet Extender

There's this[1], but only rated at one mile.

This one[2] claims it can support 15.3Mbps over a single pair.


[1] https://urldefense.proofpoint.com/v2/url?u=https-3A__www.amazon.com_Tupavco-2DEthernet-2DExtender-2DKit-2DRepeater-2DVDSL_dp_B01BOD8C9W_ref-3Dpd-5Fcp-5F147-5F2-3Fpd-5Frd-5Fw-3DjJF6B-26pf-5Frd-5Fp-3Def4dc990-2Da9ca-2D4945-2Dae0b-2Df8d549198ed6-26pf-5Frd-5Fr-3DYNZSNN4KVFDD0D7F28BC-26pd-5Frd-5Fr-3Dff2a9a7f-2Dfe54-2D11e8-2D9eb5-2Dcbf5e1b9be77-26pd-5Frd-5Fwg-3DYAFyN-26pd-5Frd-5Fi-3DB01BOD8C9W-26psc-3D1-26refRID-3DYNZSNN4KVFDD0D7F28BC&d=DwIBAg&c=n6-cguzQvX_tUIrZOS_4Og&r=r4NBNYp4yEcJxC11Po5I-w&m=TbF7NHyAPYAnOTcN0mP5L8Mx9bruJ3BQiMGiRuuEjag&s=1uB8i1QuuStq_4H-v8E2AvAuFwvzubQ5sfUHK81L598&e=
[2] https://urldefense.proofpoint.com/v2/url?u=https-3A__www.patton.com_ethernet-2Dextender_cl1314mde_&d=DwIBAg&c=n6-cguzQvX_tUIrZOS_4Og&r=r4NBNYp4yEcJxC11Po5I-w&m=TbF7NHyAPYAnOTcN0mP5L8Mx9bruJ3BQiMGiRuuEjag&s=giCSQ1Y-mYPf-JQmTFLfqlg34eDZuCD87ScHf0sOR20&e=

Something LRE possibly. Could just do VDSL.

For a comparison of distance to capacity on copper, see http://www.impulse-corp.co.uk/knowledge-base/transmission-distance-and-speed-differences-between-shdsl-and-vdsl2.htm

You might be able to pair bond – if you had more than one pair.

If wireless isn’t possible, you’re likely needing satellite.

Blackbox makes a variety of different types of " network extenders" (aka bridges) - https://www.blackbox.com/en-us/products/black-box-brand-products/networking/extenders

As others have said, 6 miles might limit your bandwidth capacity.

Six miles is probably pushing it, but Proscend make some interesting Long-Range Ethernet SFP transciever which are VDSL based. They’re horrendously documented and they draw way more power than the SFP specification allows.

They also make a version which is design to terminate VDSL broadband circuits - A couple of those found their way to my desk recently and it turns out that despite the horrendous documentation and sightly scary heat output (they come with a little paper note in the box which says something along the lines of “WARNING! MODULE GETS HOT - DO NOT TOUCH DURING OPERATION.”), they do generally Just Work!


Whenever I have a dry pair I use fluke lube.

Are there other places along the path that you could split break the 6 miles into multiple shorter links and regenerate the signal?

Hi Nick,

Where are the repeaters? Even using HDSL or VDSL, 1.5mbps T1s don't
generally extend 30,000 feet without repeaters.

Depending on how far apart the repeaters are and whether you can
substitute other equipment, you may have lots of options or none at

Also, tell us more about the terrain. Just because you don't think
it's suitable for ptp wireless doesn't necessarily mean that wireless
can't usefully play a role in a hybrid solution.

Bill Herrin

HA! But the question is; does it pass?

^^^ and that was my official 'first post' beware my linked in requests now😊

Also, if there's power and dry pair copper to the site then there are
utility poles to the site that are grandfathered under whatever the
current regulations are. Since poles rot and trees take down wires
there must also be provisions for maintaining them. A good lawyer can
probably figure out how you can add a cable to those existing poles
without running afoul of the regs, particularly since its in service
to a research site.

Bill Herrin

Actellis also makes some ethernet over dry pair gear. The only issue is that they require repeaters like a T1 (different spacing though). I’m guessing if you’re doing T1 at that distance you already have repeater housings in the field at least.

I’ve used the Patton copper link devices such as the one you mentioned Nick, and they work very well within the parameters they cover. Their tech-support is excellent also.

-mel beckman

Rent a cable plow and make a quick run of fiber during the night. Nobody will notice.


6 miles is too far to get any speed on a phone line.

Look at a Hatteras hn400 and lpu You can get about 5mbs/pair using g.shdsl. pairs can be bonded to add capacity (assuming at least 2 pair for t-1). The repeaters fit in a standard 248 closure.

I used to take “dry pairs” or “alarm circuits” and take SDSL modems to create high bandwidth ( up to 10Mbps, relative to the time) circuits. They were very reliable and incredibly cheap (@$22-88/mo). Regional bell at the time (or at least in my area) would make it difficult to order. Had to find the order codes.

Looks like these new units are updates to what was around, but they were very testy on line quality/distance. the first rule … ‘no load’. Suggest trying the water in the shallow end first.

LQ Marshall

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/


For dry pairs, I have used Flowpoint SDSL modems (see attached). I
picked these up for a sawbuck.


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.