sundance-communications.com/forum Forums TDM Business Telephone Systems Samsung Telephones & Systems iDCS100 drops calls/transfers to operator

Hello. I have a client that has a Samsung iDCS 100 R2 system that has a very strange intermittent problem. On extended calls (I'm told, over 10 minutes in length), the phone users are reporting that all of a sudden, they will get cut off of the call. Then, one of the users in the operator station group (group 500) will tell them that the call got transferred to them! The person who had the call originally did nothing to touch the phone or anything else--the call just "disappears" to the operator.

This happens a few times a day. I had a Samsung-authorized tech look into this and they are completely baffled. On a hunch, they replaced the T1 card (which I was NOT convinced would solve it). Of course, that did not resolve it.

I also moved some of the extensions in question to a different card (ie, from the CPU card to a station card). No difference.

I was suspicious of faulty wiring that another vendor had put in, so two days ago, I bypassed all of the wiring in the ceiling/walls and plugged one phone that was near the computer room directly into the phone switch patch bay. I know that this patch bay wiring is fine--I checked. (unlike the suspect wiring in the ceiling/walls, which has a few poor splices--a NO-NO in my book!) Anyways, all seemed good until today they called me and said the "test phone" lost/transferred two calls today!!! So, that rules out the wiring...

Anyone ever seen this before?

I'd suspect the power supply, as they start to fail weird things can happen (you're describing the symptoms I had that were due to a bad P/S on a 616 that I repaired a few days ago).

Look at the power supply on the upper-right corner where there are 3 capacitors, a small one and two larger ones, above a small transformer. If the two larger caps are popping up (the top will be splitting slightly showing a little black X rather than being flat and all silver) than you have almost certain located the problem.

I had suspected the P/S, too. But, a) No capacitor plague (I've repaired many devices that have had bad caps but this one does not show at least the physical signs). b) This phone switch takes about 4 minutes to reboot--if it were a P/S problem, wouldn't the entire switch crash and reboot, which would take about 4 minutes (my clients would notice that)?

Are you getting PRI errors in the system alarm log?

No PRI Errors...

Question: I have a spare DCS50 system Are the power supplies compatible? If so, I could try a swap...

I would defintily look into a P/S as well. When they start to go south weird things happen esp. in the exp cabs. I have replaced many that looked fine and ended up being the problem. Just my 2 pennies.

I have the same system at a customer here - 100 with PRI - actually its quite a full system. When the power supply started to fail, the caps were hot - but not bulging. Same symptoms - PRI issues, calls would drop for no reason. Had the carrier test the circuit - no problems found. On a lark I replaced the caps and presto - PRI problems vanished like night and day. Replace the caps, then you know 100%. Takes me 15 minutes from power off to power on to complete - I do the repair on site for the amount of time they are down.

Thanx for the replies. I wouldn't be surprised if it was the power supply. While I am 100% qualified to replace the caps, I am going to give this feedback to the certified Samsung tech and let him deal with it--this has become a rather high-profile issue and I don't want to be "blamed" if it doesn't fix it. (and any other problems that may arise).

While I agree that it MAY be the caps. I would like to make something very clear.

Samsung only advises replacement of the power supply. They do not advise replacing the caps.