Typical maximum cable run for digital phones? 1

[tmckeown]

I'm trying to work out our cabling needs for a new facility. We have two biuldings seperated by 700 feet. My plan is to bury a 50 pair, jelly filled phone cable in 4" PVC between the two buildings. With that cable and the internal cable, the furthest phone from the system will be around 1000 feet. I've been told that digital phones can have cable up to 1000 feet. Is that correct? I wanted to avoid using IP phones in the remote building if possible.

Thanks for the help.

 

[skip555]

depends on the system , the manufacturer should have specs in the docs.

you will have to go thru primary and secondary lightning protectors which will add resistance and thus cut down on the cable length.

I think you will be pushing it at 1000' for most systems

we had a situstion with a panasonic digital where analog phones would work in the distant building but we couldnt get digital phones to work .

the distant bldg was manufacturing so the analog phones were fine

 

[senk1s]

general rule of thumb - ethernet distance which is 1000 feet or 100 meters -
unterminated bridge taps reduces this distance

get the specs from the manufacturer

 

[skip555]

100 meters is 328' feet

1000 feet =304 meters

no you can run a digital station far beyond 100 meters

 

[tmckeown]

I always heard that Ethernet was good up to about 300'. But, am I going to get screwed if I plan on 1000' for the digital phones?

Thanks for the help.

 

[Lundah]

As stated before, it will depend on the manufacturer, as well as the gauge of cable being used, what lightning protectors are used, etc.

 

[skip555]

another point to consider a lot of higher pair count direct bury cable isnt evan rated at cat3

so be sure you you specify that its twisted pair cat 3 when you order it .

what type of phone switch are you using

it would help to post it , maybe someone here has experiance with that switch .

 

[ttech]

just as an example the NEC DS200 digital phones on 26AWG is 1300 feet and 24 AWG is 2000 feet

On the Merlin Magix using 24 guage wire

T/R phones and ETR phones are 1000 feet

ETR ports programmed as T/R ports is 3000 feet

MLX Phones are 3000 feet

For TDL phones is
26 guage = 2000 feet
24 guage = 3000 feet and
22 guage = 5000 feet


Don

 

[letman]

we go 2000 ft on avaya 8700

 

[ISDNman]

As others have said, you can't assume anything.

About the only exception is VOIP phones, since Ethernet is well defined (100 meters as mentioned), and non-proprietary.

Some PBX vendors of special station cards for longer distances, or sometimes a local power supply near the terminating end is all that is required to extend far beyond the usual limit.

We did tests with Mitel Superset 4's on a line emulator and they worked at 7000' and did not work at 7500'

My guess is that most digital phones are going to work in your situation - the distances involved are not that huge compared to a large business situation. But, that said, best to contact your PBX vendor now, before you do anything, and find out what the limits are.

If the distances are too great, you'll need to install a remote shelf (e.g. actualy part of the PBX) in the new building and connect it with whatever it requires (possibly fiber, possibly a few pairs).

Best of luck.

 

[tmckeown]

We're looking at Avaya IP Office and Inter-tel Access for our new system. Both vendors have stated that 1000' was OK, but I just want to check with some real-world experience.

 

[bikechuck]

larger yer cable, longer it works. Lower number- bigger conductor will work better.

 

[tmckeown]

Bummer,
I just finished a site survey with a tape measure. The furthest run is 1300'. That might exclude digital phones for this remote building. I now need to look into other options.

 

[mforrence]

From memory, the IP Office digital stations have a greater distance limitation than Inter-Tel Axxess (I'm Axxess certified, but I don't have the spec handy). The IP Office new 5400 series digital stations are specd at 3500' on 24AWG wire (5500' on 22AWG - supporting bikechuck's "bigger the cable...). Shortest spec is using 4424D+ at 1640' on 24AWG. So long as you have good protection, you should be able to make digital work. Good luck.

Mike

 

[Trotski]

I have used an Amp on a Panasonic TD500 Digital Phones to work over 600mtrs(1800')Don't remember the Manufacturer but I will find out and post the link for you to look at

 

[tmckeown]

Thanks for all the help. These forums are total life-savers. It's great to get help from people with real life experiences, instead of a poorly written manual. The amplifier idea might be the way to go, if we end up with trouble due to the distance.

it's great to know that IP Office may not have a problem over the 1300' run.

thanks,

 

[Trotski]

look at

http://www.design2000.com.au

the Panasonic DPITS repeater will extend the line length upto 1.2Km

there are also other products that may interest you

 

[Trotski]

here is the link to the actual doc in question

http://www.design2000.com.au/product/PR-4928-G02150.doc

 

[tmckeown]

Thank you very much for that info. That's an interesting product. It appears to be a single line only, but I could mount multiples in a rack. We will have 20 phones at the remote building. I'll investigate it further.