I'm reminded of a time at a Telecom company I worked at in the 80's which all the boards were through hole back then, and a system that was in the final testing stages before shipment. It was heading to Japan for one of the Telcos there and they were on site to supervise the testing. After all the signal tests and visuals were done and the system passed without a hitch, one of the inspectors from Japan pulled out a small rubber hammer like the ones the doctors use to check reflexes. He proceeded to tap on each of the cards in the system and watching for any issues that may show. As he tapped on one of the cards, the output readings bounced and failed and came back. As he tapped again, the same outcome occurred. We found out there was a bad solder joint on one of the filter coils and replaced the card. The system passed the "hammer" test and was shipped, but I've never seen another test like that since. Shock and Vib is common now days, but I guess this was that test on a system level, in 3 large 19" racks... Every time I see the doctor pull out that hammer now, I think about that test and wonder if I'll pass? :-/
Then there was the Earthquake testing we did on a system for a California Telecom company. I've never seen a 19" rack bend with 4" channel racks, but they do...
Happy Thursday!
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-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Ioan Tempea
Sent: Thursday, January 18, 2024 06:36
To: [log in to unmask]
Subject: [External] Re: [TN] IPC DTDs
Hi Victor,
Maybe you need to expand a bit:
- In manufacturing, all electronic products abide to IPC standards, as Doug mentioned. Unless they are produced by folks absolutely wanting to use NASA or other niche regulations
- When designing and qualifying your new product, i.e. making sure it will live as long as you need, you'll probably need to use Telcordia standards, check this https://urldefense.com/v3/__https://linkprotect.cudasvc.com/url?a=https*3a*2f*2feffectphotonics.com*2finsights*2fthe-whats-and-hows-of-telcordia-standards*2f&c=E,1,oA3bS180Tozop9Kj7pdVIR28UghxSr2h7x1HxRNzyImoKyytHYsoH8mJpzDio5mp7WUKA3O9Mywlelw8VhoIIMUzS06lqEANt1hW4zbj6aK55RHnNvyGDCo6&typo=1__;JSUlJSUl!!MvWE!EsvZobltGbM55egC22FVYWISmuvgvQEhL5LpqGiymeSOxJwe2uLMzYRHyiiibGHdzWkY1ufy21mAE5iQRKDIzE1xaUf8oH1faMw$
Most telecom equipment also require some form of post-assembly screening to weed out infant mortality
Cheers,
Ioan
-----Message d'origine-----
De : TechNet <[log in to unmask]> De la part de Pauls, Doug O Collins Envoyé : January 18, 2024 8:16 AM À : [log in to unmask] Objet : Re: [TN] IPC DTDs
Victor,
The IPC Classes (1,2, 3) apply to all products. Most Telecommunications are considered Class 2. If the function of the product is life critical, mission critical or safety critical, it should probably be built to Class 3.
Douglas Pauls | Sr. Technical Fellow | Electronics AMT COLLINS AEROSPACE
400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
Tel: +1 319 295 2109 | Mobile: +1 319 431 3773
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Hernandez, Victor G
Sent: Thursday, January 18, 2024 6:44 AM
To: [log in to unmask]
Subject: [External] [TN] IPC DTDs
Fellow TechNetters:
Does IPC STDs also apply to Telecommunication Products such as PWB?
Concern is that some Telecommunication Products are mounted at high elevations.
Victor,
Internal Use - Confidential
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