Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
UMBG(4)		       FreeBSD Kernel Interfaces Manual		       UMBG(4)

NAME
     umbg -- Meinberg Funkuhren	USB5131	and DCF600USB timedelta	sensors

SYNOPSIS
     umbg* at uhub?

DESCRIPTION
     The umbg driver provides support for Meinberg Funkuhren USB5131 and
     DCF600USB time signal receivers for the German DCF77 station.  umbg im-
     plements a	timedelta sensor and the delta (in nanoseconds)	between	the
     received time information and the local time can be accessed through the
     sysctl(8) interface.

     The quality of the	timedelta is reported as the sensor status:

	   UNKNOWN     No valid	time information has been received yet.

	   OK	       The time	information is valid and the timedelta is safe
		       to use for applications like ntpd(8).

	   WARN	       The time	information is still valid, but	no new time
		       information has been decoded for	at least twelve	hours
		       due to a	reception or parity error.  The	timedelta
		       should be used with care.

	   CRITICAL    No valid	time information has been received for more
		       than twelve hours since the sensor state	degraded from
		       OK to WARN.  This is an indication that hardware	should
		       be checked to see if it is still	functional.

     A second sensor provides the relative signal quality as a percentage.
     The status	of this	sensor is used to report the status of the device it-
     self:

	   OK	       The clock is synchronized.

	   WARN	       The device's clock is free running on the local oscil-
		       lator.  This is not an error and	can happen due to the
		       nature of the signal transmission using longwave	radio.

	   CRITICAL    Hardware	failure, e.g. communication with the device
		       failed.

SEE ALSO
     intro(4), usb(4), ntpd(8),	sysctl(8)

HISTORY
     The umbg driver first appeared in OpenBSD 4.3.

AUTHORS
     The umbg driver was written by Marc Balmer	<mbalmer@openbsd.org>.

FreeBSD	13.0			March 26, 2019			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=umbg&sektion=4&manpath=OpenBSD+6.9>

home | help