Edimax Technology Wireless 3G Portable Router 3G-6210n - Manual (Page 36)

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NOTE: There are several time servers available on internet:
129.6.15.28 (time-a.nist.gov)
132.163.4.101 (time-a.timefreq.bldrdoc.gov)
131.107.1.10 (time-nw.nist.gov)
If you found that the time of router is incorrect, try another time server.