At 11:36 AM 9/17/03 -0500, you wrote:
>At 04:32 AM 9/18/2003 +1200, Russell McMahon wrote:
>
>>> >> 3ma is allowed.
>>
>>> garrgh...
>>> my brain said 3ua, and my fingers said 3ma....
>>
>>Oh good. You had me worried :-)
>>Now we just need to deal with the 12 volts on hook :-)
>
>that's real. not frequent, but real.

If you design telecom stuff for "desktop" aps, you can get bitten by this
in the following scenario. The FCC (in the US) regs certainly have bounds
that are much higher - for equipment connected to the Public Switched Network.

However, once you are not on the network - for example, in an office
building on a customers premise you may encounter systems where 12 volts
makes you happy.  Electronic phones on proprietary systems think nothing of
trying to operate with less than this.  They have their own switch gear to
route all inside lines to the actual phone lines coming in and present
'correct' impedances and voltage levels to the PSN.  But inside, they do
what they want.

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