8 X 24 DR5 problem distance/cable issue?

[phoneguy2286]

I have a DR5 with about 10-12 phones on it. We ran a cable about 280 feet...outside...to connect a phone in a warehouse environment.

The phone won't come up...flashes, but that's it.

I have tried all of the usual suspects....verified the port is working, even tried a brand new phone, and a SAP on the second pair. I verified all of the pairs are good (connected them to a C.O. line, and got dialttone..so the cable is not shorted out.)

Here's what we have:

8 x 24 DR5
280 feet of CAT5e direct burial TWISTED pair cable
M7310
24v SAP if needed.

I have a feeling it may have something to do with the twisted pair.

Has anyone run across a similar issue?...have a fix?

Thanks,
Gene

 

[jerryreeve]

first. How long did you let the phone flash? sometimes it takes 3-5 minutes to come up.

second. did you try hooking up the phone in question to the port in question at the phone room?

third. 280 feet should be no problem you should be able to run out to 1000 ft before you need to put a saps on the line.

you can try to double up the pairs to increase the copper that is carrying the signal. I have done that in the past for some systesms.

If voting could really change things, it would be illegal.

JerryReeve
Communications Systems Int'l
com-sys.com

 

[hawks]

The SAP should go on the T&R pair not the second pair. But I have to agree with jerry 280 ft should not need additional power.

 

[silver987]

Try changing ports, I had an instance where a port would not recognize a phone but a different port would. Very strange??

 

[galfaro]

I would use cat 3 instead of cat 5e cable.
I have ran cable longer than 280 ft with out a problem. I think the cable is the issue, but don't know why.
But verify the usuals, port, phone, jack, etc.
Gabriel

 

[silver987]

I don't agree with galfaro, I don't believe cat-5e would do anything but enhance the connection.

 

[phoneguy2286]

yeah...

I checked the port.....even tried a different port.

I let it flash long enough... I left it overnight...flashing...(just on a chance)

I have never placed the SAP on the Tip/Ring...always on the second pair...

which is correct?..if the power goes on the T/R, what polarity?..Tip=+..or Tip=-

 

[Arr]

Galfaro may have something here... It is REMOTELY possible that the pair you have used on the Cat5 is resonating with an emmission in the environment. Split the pair used into two dissimilar legs Br/W & W/Or say and see if that makes a difference.

Check voltage at set end .. should read about 10VDC; and

Just for laughs try an RF filter on the pair used.

Continual flashing is a data transfer problem on one of the channels. I don't remember clearly but I think it's the D channel.

Thoughts on outside plant:

The grease must be cleaned off well. It can make a semi path to ground in the correct circumstances;

If you have tried to do right and put in lightning protection ensure you have used 16 or 30 volt clamping gas protectors. Old style carbons can also provide a ground path, particularly if they have taken a hit;

Outside cable often comes as 22AWG which may not connect well to 24AWG terminals on such things as a BIX1A or 110 AT&T terminals;

Where you have even a short overhead lightning protection should be installed; and

Check your connections carefully from one end to another looking for a poor connection as a point of failure.

Cheers
PhM

 

[hawks]

The SAP on the 2nd pair is for the CAP unit.
The following is from PERRYPJ and thread799-663449

"IN NORSTAR CLASS THEY SAID YOU COULD TAKE A -24VDC POWER SUPPLY AND PLACE IT IN A IDF SAY HALF WAY AND CONNECT THE POWER SUPPLY TO THE TIP AND RING OF THE LINE, BEING CAREFUL TO PLACE THE - AND + ON THE CORRECT SIDES.
NEVER HAD THE OPPERTUNITY TO TRY IT BUT I SOUNDS LIKE IT MAY WORK.

 

[phoneguy2286]

I've tried different variances of "legs" of the cable...w/bl + w/or, w/gr + bl/w, etc, etc. I also even tried 2 PAIR on each connector... here it gets kinda interesting: The LED light on a T7316 would just flash rapidly.. I have seen that before, but don't really remember the exact circumstances. I am going to go try one more time before suggesting an ATA (remember C.O. dialtone worked perfectly).

Thanks for all the help

 

[jerryreeve]

the real quick flash like a flitter almost I have seen two ways. onece with the 7316 plugged into a CO port instead of the norstar port. second when the phone took a lightning strike in the area and blew out. both were repeatable in other locations and the second was fatal to the telephone.

If voting could really change things, it would be illegal.

JerryReeve
Communications Systems Int'l
com-sys.com