EEVblog #1177 - Ericsson PABX Teardown - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 05, 2019, 10:38:47 pm
content: What's inside the Ericsson / LG IPECS PABX left behind in Dave's new lab. Along with a Jabra Bluetooth headset

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: February 05, 2019, 11:32:05 pm
content: But Dave, you didn't include the full video of the original unit that you where doing in the tear down , letting out all themagic smoke outAnyway, I got flashbacks of working many years ago atTie Communication(now defunct)in Shelton Connecticutwho made POTS PBX telephones systems for businessesNice units back in the day, state of the art PBX systems with expandable truck and line cards, CPU boards , and big switching powers supplies to runthe whole rack unit including the many phones that connected to itI also worked for telecom manufactures Nitsuki America and Harman Simmons Power supplies who made bad ass switching and linear power supplies

author: tsman
author_rank: Frequent Contributor
timestamp: February 06, 2019, 12:17:26 am
content: Those Jabra headsets look to be DECT so the blinking is probably the headset complaining it can't communicate with its charger/basestation.The HDMI sockets are for connecting to an expansion unit for more lines. They've got a weird HDMI plug with a retaining screw mechanism.

author: johnh
author_rank: Regular Contributor
timestamp: February 06, 2019, 07:22:25 am
content: Handset lifter when call is answered from the jabra headset

author: rrinker
author_rank: Super Contributor
timestamp: February 06, 2019, 02:43:22 pm
content: This was probably one of the few videos where I was actually yelling at the screen, first that the headsets weren't Bluetooth, then that the device ont he phone was a handset lifter, and then on the inside of the main unit, about all the unpopulated components, because that same PCB is used for both a 4 line and an 8 line expansion card, and the people in that office before only needed a 4 line version.But Dave came through and figured it out in the end. I think - though he never really corrected the idea that the headsets use BT, even after he pulled up the datasheet for the chip inside which says it's a DECT controller.Kind of surprised Dave's not come across such equipment. I know not much of his professional career was spent working for big companies that might have all the fancy gadgets, but surely Altium has a halfway decent phone system? I don't mean knowledge of the controller itself, but out at the user interface side, the phones and headsets. Some of my coworkers who spend almost their entire day on the phone have headsets, but they aren't those nice fancy pants Jabra ones. Somewhere I am pretty sure I saved a phone from our old system before we went to a more modern IP telephone solution. I know I saved all of the phone to wall cables I could, because my model railroad control system uses those same 6 wire flat cables our old phone system used. For a small office, our controller was HUGE, so I didn't save that. Probably 10X the physical size of the one in this video, and at our peak we had maybe a dozen and a half extensions. Possibly 2 dozen. Not sire why we had such a monster system - grandioise expansion plans I guess, but we got bought out and as soon as we got linked into the new corporate network, the installed the equipment and replaced all the old phones.

author: EEVblog
author_rank: Unknown
timestamp: February 07, 2019, 12:30:12 am
content: Quote from: rrinker on February 06, 2019, 02:43:22 pmEngineers in cubicles don't get phones.Actually, I think we did at Altium, but hardly ever used it.Phones at all previous companies were your basic POTS touch tone.

author: EEVblog
author_rank: Unknown
timestamp: February 07, 2019, 12:32:02 am
content: Quote from: johnlsenchak on February 05, 2019, 11:32:05 pmWhat's the point, I couldn't finish the video because it smoked and stunk the place out, I had to keep it in a box.

author: Andrew McNamara
author_rank: Regular Contributor
timestamp: February 08, 2019, 01:35:27 am
content: Quote from: EEVblog on February 07, 2019, 12:32:02 amI hope we eventually get to see a video of the offending item, maybe with some analysis of what went wrong, even if only on the second channel.