"LINE IN USE" WHEN USING TIE LINES ON A T1

[jr6674]

HERE IS THE SITUATION , WE HAVE TWO OFFICES CONECTED WITH A T1 AS TIE LINES BUT ABOUT TWO WEEKS AGO OUR SECOND OFFICE HAD A PROBLEM WITH HARDWARE AN ADTRAN 550, SINCE THEN WE HAD THE ADTRAN FIX AND I CALL OUR T1 PROVIDER TO TEST THE LINE AND EVERYTHING CAME CLEAN, BUT NOW WHEN I TRIED MAKING A CALL FROM OUR MAIN OFFICE TO OUR SECOND OFFICE(WHERE THE ADTRAN 550 IS LOCATED) USING THE THE T1 LINES I GET THE MESSAGE "LINE IN USE" FOR EVERY SINGLE LINE ON THE T1.......I RECALL OUR T1 PROVIDER AND THEY SAID THAT EVERYTHING TEST GOOD TO THE CSU ON BOTH SIDES OF THE CONNECTION......I HAD TECHNICIANS CONFIGURE THE ADTRAN PROPERLY AND ALSO CHECK THE CONNECTION AND PROGRAMMING ON BOTH SIDES AND THEY SAID EVERYTHING IS FINE BUT THEY STILL COULD NOT FIGURE IT OUT......MAYBE SOME ONE OUT THERE HAD THIS PROBLEM OR HAS SOME IDEA OF WHATS GOING ON.

THANK YOU IN ADVANCE FOR YOUR HELP

 

[PERRYPJ]

YOUR GOING TO NEED SOME TYPE OF TEST GEAR TO LOOK AT THE T1 COMING INTO THE SWITCH, MY GUESS IS THAT THE PROTOCAL IS WRONG COMING IN THAT'S WHY IT'S SAYING "LINE IN USE".
IN AN IDLE STATE YOUR A/B BITS SHOULD BE 0'S IN BOTH DIRECTIONS, IN AN OFF-HOOK STATE YOUR A/B BITS GO TO 1'S

OLD ROLMEN WORKING ON NORTELS