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Raspberry Pi Forum Epitaxial vs 1N4002 Diodes
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Forum Thread Details
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  • epitaxial
  • diode
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Related

Epitaxial vs 1N4002 Diodes

balearicdynamics
balearicdynamics over 10 years ago

Someone knows if it is acceptable to use diodes of the type 1N4001 or 1N4002 instead of epitaxial diode to manage signal channels with levels and frequencies of the order of the Ethernet 10/100 ? I have never used the Epitaxial pin diodes and I have no idea.

 

Thanks in advance, any suggestion is welcome image

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  • clem57
    0 clem57 over 10 years ago
    • SP3002 0.85pF, 12kV, Low Capacitance Diode Array for ESD Protection  should work for ESD protection...

    Clem

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  • balearicdynamics
    0 balearicdynamics over 10 years ago in reply to clem57

    Many thanks, Clem.

     

    In the meantime after a reasonable investigation on the use I had in mind it seems that it is not the better solution. I was exploring the possibility to have a passive hub but it is not so reliable and - worst of all - it seems that with the LAN works only in half-duplex. The best usage seems to be with TV signals integration but it is not my case.

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  • clem57
    0 clem57 over 10 years ago in reply to balearicdynamics

    Unfortunately LAN is a half duplex protocol as you found out.  If you want full duplex, SPI is the way to go. But it is meant  as a limited distance. How far do you need to go?

    Clem

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  • rew
    0 rew over 10 years ago in reply to clem57

    LAN has been full-duplex..  for some time now (*). For 10 and 100Mbps there is a pair of wires dedicated to each direction, and both can be active at the same time. For 1Gbps LAN over CAT5 cable, all four pairs are used. There can be datatransmission going on all pairs in EACH direction at the same time.

     

    But I'm getting the impression that I'm missing some context.

     

    (*) Remember the coax cables for 10mbps? If you got a terminator wrong, the whole network stopped working. (#)

    (#) Anecdote: 1992-ish: I wanted to hook up an extra workstation in my room. So I hooked it up and walked over to the sysadmin to ask him if I'd done it correctly. But by the time I got there, his phone was red hot, so I saw that he was busy with more important things and I went back to work.... It hit me when 15 minutes later I saw him diving under my desk..... the last room he was checking for missing terminators and the like....

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  • clem57
    0 clem57 over 10 years ago in reply to rew

    I am referring to the protocol at software level. Cannot send/receive at same time in software interface. But there is some acks under the cover that are overlapping.

    Clem

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  • clem57
    0 clem57 over 10 years ago in reply to rew

    I am referring to the protocol at software level. Cannot send/receive at same time in software interface. But there is some acks under the cover that are overlapping.

    Clem

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 10 years ago in reply to clem57

    That's a limitation of the application. Not the network stack or you would never be able to surf in multiple browsers and have a file transfer going and watch TV / my youtube videos at the same time  

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  • michaelkellett
    0 michaelkellett over 10 years ago in reply to clem57

    I'm baffled now - are we seem to be talking about Ethernet but which protocol:

     

    It's easy to send and receive UDPs simultaneously, TCP links usually look full duplex even to quite high level software - I'm obviously missing something but not sure what image

     

    MK

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