Length of network cable

Get two fiber converters to change your copper interfaces to Fiber.  Pull fiber to go the distance, and then convert back to copper.

Other options are to use wireless on the rof of both buildings, perhaps with an antenna booster.

Same for optional Laser if they are line of sight.

I hope this helps !

Speaking of options, there's always a Wide Area Network - over the telco's lines - from ISDN, metro Ethernet, T1, etc.  However, if you can own the cable plant, better than leasing from the Telco.

I have made of runs of 150' with cat6 and didn't have any problems... Take care in making up the ends...try and keep all bends  as smooth as you can...you don't want to kink it..... Are you going to bury it in conduit? Suspend it from roof to roof? Sunlight will breakdown the insulation, as well as the local rodentia..so keep that in mind...Booda

150' is no problem - the spec is 100m (328 +/1 ft) - 90m (294 ft) of which should be horizontal cabling, and 5m (16ft) patch cables on either end.

Uh, read the ORIGINAL question...they're going 115m.

If bandwidth is not an issue, use the existing cable to run as a T1 and deploy two cheapo Ethernet/T1 routers.  You can go 1000'-2000' on Cat5 when doing T1; the 100m limitation is inherent to Ethernet, not Cat5.

Excuse my ignorance but what do you mean by T1 - to be honest net working isn't my forte so will need a an explanation for dummies.

With thanks for all your comments so far and please keep them coming

Thanks

Scusem moi'...I meant to say 150 yards, I'm sure glad you guys missed me while I was gone. Ok, are the buildings 115 meters apart?, or is it 115  meters from the router to the building?  If it was me...I would just put another ADSL connection into new building/ setup a VPN/ and tunnel in,but that's just me. If you insist upon running CAT6 all the way I strongly advise to put a switch in the middle somewhere..as per  SysExpert's..suggestion, or go all in with the T1 like PJ said...I'm not gonna hijack Pseudo 's thread tho', as I think that might be a lil expensive...there 2 out of 3 ain't bad...Booda

There's more to life than just Ethernet.  T1 is DS1 (digital speed 1, a data rate of 1.536Mbps) over copper, running at 1.544Mbps with 8kbps of overhead.  True end-to-end status monitoring and much better at spanning large distances (though repeaters are needed).  You'd need a pair of Adtran TA600 (but I'm not recommending those), Cisco 1720 or better with WIC-1DSU-T1, or other comparable routers to activate the T1 and put it to use.

Doing a second ADSL with a VPN tunnel would be much slower than T1, as any data exchange is always over the upload path of one ADSL or the other and therefore limited to 128kbps or 384kbps.  You'd also have a monthly charge that'd surpass the initial capital cost of the two routers.

IMHO, if you can own the physical infrastructure -  you're better off in investing in your network - than leasing it with reoccuring costs, deferred responsibility, limitations on use, etc. etc.

When one of mentions a T1 or a DSx - we're referring to "high speed" serial lines leased from the friendly Telephone Company.

I agree that investing in physical infrastructure is better.

That's why I'm suggesting a private infrastructure T1 between the buildings.  No telco needed, no monthly recurring costs.  Just two routers (one configured to give the T1 clocking), and now they're networked.

pjtemplin, most of the cost of cabling is labor - so why expend relatively the same amount of effort in putting in copper which can haul 1.5Mb when they could instead put in fiber which would be comparatively unlimited?

Go to Burger King, have it your way.

LOL - why ask why?

I think looking at all the options that the fiber link and convertors are going to be my best bet as the cable will be going outside the building to a remote location

trouble is I've just looked at available cable and I'm confused with all the different types and which would be best suited?

Most likely, you'll want Multi-Mode.   Pull a few extra strands for future use.

you will save a lot of time and effort with a high gain wireless setup, unless there is alot of interference, you can buy or build directional shields wich will boost your signal from WAP to WAP

Sorry for the long time in getting back to this but the legnth of cable was a mere 5 meters over the 100 and it has worked just the same- I used Cat 6 cable
thanks for the solution