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  • EEVblog #547 – Dumpster Phone Teardown

    Posted on November 13th, 2013 EEVblog 5 comments


    Dave tears down and salves some parts from old Panasonic, Telstra, Cisco, Nortel, and Polycom PABX and VOIP phones found in the dumpster.
    Are there any salvageable parts in them?
    Forum HERE

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    4 responses to “EEVblog #547 – Dumpster Phone Teardown” RSS icon

    • I think those daughter boards are usually made for the mechanical isolation of the components that get more stress – like connectors, switches, encoders.

    • http://en.wikipedia.org/wiki/Tetanus

      Always a good idea to be vaccinated and keep up with the booster shots when you’re likely to get punctured.

    • The TMS320 is just a bargain basement DSP you need to encode/decode (compress/decompress) voice data for IP phones and the digital signalling networks.

      The reason a lot of phones are made in Australia is because Australia has a few funny regulations involving phones and approvals and legals and all that. So the Australian version of phones are typically made to satisfy Australian regulations that are probably not seen elsewhere around the world – most other countries generally follow stuff like US FCC regulations and all that.

      Nortel does not exist any longer – but they do have a HUGE installed base so companies aren’t exactly replacing their phone systems from Nortel to something else. They went bankrupt shortly after the .com crash of 2001. They’re pretty much so standard you can find a mix of Nortel, Northern Telecom, etc., as they went through various branding moves and remained extremely compatible. Was a Canadian company (the ‘Northern’ part referred to their time as the telephone company for I believe the Northwest Territory and Yukon).

      Oh, and don’t underestimate the value of acoustics – phone speakerphones are usually an afterthought until you actually use them and have to put up with various rattles, resonances and other distortions. A phone line is bad enough – the phone shouldn’t get in the way to make poor audio quality even poorer that makes speech even more difficult to understand. (LIkewise, that DSP may be used to do a lot of echo cancellation and other things to clarify the audio).

      It’s why you’ll probably find those Polycom speakerphones everywhere because Polycom tends to have great acoustics. Anyone who’s worked in an office knows which phones are great for speaker phones and which are just plain old terrible.

    • I really liked this fast teardown video.

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