Our system drops incoming calls.... Sometimes it drops after 1 ring, sometimes after 2 or 3 rings and sometimes not at all.... and does it on all 3 incoming lines... here is what I have done in order:
replaced both trunk cards, Didn't fix it...
Re-Punched down all incoming lines... didn't fix it...
Replaced extension cards just for grins, didn't fix it...
Replaced card next to CPU with spare, didn't fix it...
Replaced CPU card with another 2.5.1 card and moved E-Proms so I wouldn't loose config... didn't fix it...
Repalced CPU again with another one I found on the web with V3.0.x software, still didn't fix it...
Nothing appears in the status screens..... shows the line ring then just goes away... So I went to the cabinet and then rang in until it dropped a call and I hear it ring in my cel phone, about a 1 second delay then the internal phones ring then I hear a "click" coming from the PBX and the call drops...
About the only I have not changed is the phones, the cabinet and PS, and the breakout box....
Any suggestions? It does it on all 3 incoming lines so I would guess it is not line related, is this a good assumption?
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I'm not Telcom litterate, but I will try to answer....
Phones are programmed to ring using the programming screens for day vs night rings and lines... No ringing groups I think.... Normally all calls ring about 4 times then the system picks up and then plays menu's for them to select where to go and how to get there....
About 8 phones currently ring when there is an incoming call...
as for the lines? There are 3 2-pair lines from the Telco, they come inside to the punch down, and then go through the panel to the card via the big centronics connector.... so normal telephone lines I guess.
what happens when you plug in a single line phone directly to the phone line? does it ring properly and can you answer the call each time? (You can buy a single line (house) phone at Staples for $15). If not call your carrier, and have the ring signal checked. It it works correctly then verify that the IDS is properly grounded. the ground connector is on the cabinet backplane, left side. it usually is a green connector. use #14 AWG wire and tie it to an electrical ground point. Verify it with an ohm meter. Also check the ring low, ring high in the "B" screen, the setting should be 10 and 50. try lowering it to "0" and raising it to "70". I can see from your previous posts (ie. Dec 15th) that you have the lines installed in parallel with a CID MLX. have you tried disconnecting the CID box and letting the IDS run for a few days without this device to see if the disconnect problem disappears? Best way to determine what you are getting for a "ring signal" is to use an 0-scope. IDS will work with sine and square wave ring signals, no higher than 30 hz. there were some issues with trapezoidal ring signals causing crazy problems with the IDS. check your trunk line amperage, anything above 50 milliamps causes connect problems with the IDS. if above 50 milliamps, you can pad the tip and ring with 300 ohm, 10 watt resistors to lower the milliamps. Tj
Ok, I made sure the ground was good.... it was....
I then changed the Hi and Low ringing and the symptom remains.....
Here is what I see and hear at the KSU when it is not working.... I hear the phone rining the extensions in the background like it should, then I hear the CO Card relay pickup and immediately release the call via the little blue relays on the card. Also the last bottom red LED on the card comes on then immediately goes off and the call is dropped...
I removed the Caller ID box and no change.... still drops... I did maybe notice something though.... when someone is talking on line 1, and another call comes through it appears to NOT drop the second call intermittent... Don't know for sure or what that means though.....
Have not yet put a scope on the line, maybe that is next....
BUT sometimes it works just fine for 2-3 hours, then sometimes it flakes out every other call....
I get NO INDICATION the system is picking up the call on the status screen.... How can the relay pickup the call and drop it without the status screen saying so?
check the drop pulse timer on the co lines, it should be 010 by default. if you change it to 000 the line will never disconnect!(don't do that!) try changing it to 014, first.
also, check the ' toll option screen ' it should be :
Y N N N N N make a note of what you have there first before messing with this.
