[EMAIL PROTECTED] (Andy Helten) writes: >I use PoE every day -- it powers the outdoor antennae that connects to >my wireless ISP (distance of about 5 miles). I have gotten up to >3000kb/s over this link (which is slightly higher than what I'm paying >for). So, whatever you are debating here, PoE is almost certainly *not* >the problem.
OK, learn something new every day! I do agree that it is weird that they would have put SNTP on that thing rather than NTP. How much did it cost? >David Woolley wrote: >> Unruh wrote: >> >> >>> Just looked it up. A bit bizarre-- power over the ethernet? The ethernet >>> has no power supply capability. Do you mean that you have to supply the >>> device with 60V running on one of the unused ethernet cable lines? Sounds >>> noisy to me. >>> >>> >> I believe it is a relatively new, but very real, standard. The power is >> transmitted as a phantom between two pairs. In one variation, they are >> the pairs used for normal, 10baseT. I gather one reason is that there >> are exemptions in electrical codes for ELV power feeds as part of >> datacommunication systems, whereas a normal feed would require a >> formally qualified (not just competent) electrician. >> >> The feed is 48V DC. I'm not 100% sure that counts as ELV, but it is the >> same as most analogue telephone systems. >> >> The apparent source specification is IEE 802.3-2005, although I haven't >> gone to source. >> >> As the power is common mode with respect to the signals, the noise >> should not be excessive. >> _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
