[ntp:questions] ntp server specs

David Woolley david at ex.djwhome.demon.invalid
Wed Jun 15 06:36:36 UTC 2011

Chuck Swiger wrote:

> TTL voltage swings rather than needing the +/- 3V minimum of RS-232;
> they also are in-spec with up to ten receivers on the line.

The +/-3V monotonic swing is a requirement on the driver, not the 
receiver; the transition region requirement for the receiver is much 
narrower and being all above zero is actually encouraged (so that 
undriven lines end up in the right state.

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