atcomsystems.ca/forum Forums TDM Business Telephone Systems Panasonic Telephones & Systems TDA-200 Questions...

Hi all.

I have a possible client that wants to link 3 buildings via copper using 1 phone system.

Building 1 has a TDA200 with 50 or so 7000 series stations.
Building 2 has a KXTD1232(?) with 30 or so 7000 series stations.
Building 3 has a TDA200 with 20 or so 7000 series stations.

The client wants to use building 1 as the pbx location. The distance in cable routing will be about 1200 feet to the idf in building 2 and about 2000 feet to the idf in building 3.

My questions:
Can the TDA run a digital station at 2000+ feet on 24awg copper?
If not, can the TDA systems be linked together by fiber / twisted pair?

My contract will be to just provide the facilities to link the buildings. I'm not going to learn a new switch - not to mention these are dealer only switches according to the Panasonic site.
Thanks for any input you can give.

2000 feet, I don't think so. the max loop resistance for the 76xx series is 90 ohm, 24 agw has 25.67 ohm per 1000 feet, I think that is only from point A -B but a loop resistance is from point a-b-a, correct me if I am wrong. so 1000 ft would have a resistance of 51.34 ohms 2000 feet would be 102.68 ohm, and that is with perfect runs and no joints/patching.

What I would do is put a fiber link in to a poe switch and run the kx-nt ip telephones in buildings 2 and 3,the telephones look and work exactly the same as the 76xx telephones and don't cost a whole lot more, put in 4 x 16 ip extension cards and 4 x 16 digital ext cards for the local building that will give you 64 ip extensions and 64 digital extensions using 8 of the 10 slots.if you were tight on slots you could drop 1 digital extension card and use some of the ip phones in building 1, still going to use same amount slots as all digital

extra costing would be the POE switches

If you are running a fiber for data it could be used for voice as well, gut a seperate network for the phones would stop the it guy and the telephone guy from blaming each other for traffic problem
Just My 2 cents worth

Thanks for the input, but which is it?

"24 agw has 25.67 ohm per 1000 feet"
"so 1000 ft would have a resistance of 51.34 ohms"

@#$@! Almost 30 years in this field and I dont know the friggin resistance of 24awg.
I need to get out of this line of work. I'm gettin too old.

OBT said the LOOP resistance is from point A to B and BACK to A. So for a 1000 foot run the the LOOP distance is 2000 feet for a resistance of 51.34 ohms (2 x 25.67).

You said you are only putting in the back bone, let the Panasonic guy spec what he wants installed, because it is up to him to get it working and supply the correct equipment

Sounds like 2 private PRI links on customer provided (Read that as Andy Ellis provided ) copper links. That is what you suggest to the Panasonic tech. The TDA200 AND the TD1232 are both capable of PRI. I suspect the Panasonic tech's estimate will kill the whole deal. I'm guessing upwards of $10,000.00. It will require a LOT of programming, and broad knowledge! John C.

Thanks guys.
OBT, I totally missed the "there and back" aspect.