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Diffstat (limited to 'share')
| -rw-r--r-- | share/man/man4/umbg.4 | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/share/man/man4/umbg.4 b/share/man/man4/umbg.4 index 5e8a993f39d..68bb45f60da 100644 --- a/share/man/man4/umbg.4 +++ b/share/man/man4/umbg.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: umbg.4,v 1.1 2007/11/10 13:01:11 mbalmer Exp $ +.\" $OpenBSD: umbg.4,v 1.2 2007/11/10 14:13:57 mbalmer Exp $ .\" .\" Copyright (c) 2007 Marc Balmer <mbalmer@openbsd.org> .\" @@ -32,6 +32,38 @@ implements a timedelta sensor and the delta (in nanoseconds) between the received time information and the local time can be accessed through the .Xr sysctl 8 interface. +.Pp +The quality of the timedelta is reported as the sensor status: +.Bl -tag -width "CRITICALXX" -offset indent +.It UNKNOWN +No valid time information has been received yet. +.It OK +The time information is valid and the timedelta is safe to use for +applications like +.Xr ntpd 8 . +.It 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. +.It 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. +.El +.Pp +A second sensor provides the relative signal quality as percentage. +The status of this sensor is used to report the status of the device itself: +.Bl -tag -width "CRITICALXX" -offset indent +.It OK +The clock is synchronized. +.It WARN +The device's clock is free running on the local oscillator. +This is not an error and can happen due to the nature of the signal +transmission using longwave radio. +.It CRITICAL +Hardware failure, e.g. communication with the device failed. +.El .Sh SEE ALSO .Xr intro 4 , .Xr usb 4 , |