NAME
mbg —
Meinberg Funkuhren timedelta
sensor
SYNOPSIS
mbg* at pci?
DESCRIPTION
The mbg driver provides support for
Meinberg Funkuhren radio clocks (time signal station and GPS receivers).
mbg implements 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 card type is indicated in the sensor description. Currently,
the following cards are supported by mbg:
- GPS170PCI
- 3.3V/5V 6-channel GPS receiver card
- PCI32
- 5V DCF77 time signal station receiver card
- PCI509
- 5V DCF77 time signal station receiver card
- PCI511
- 3.3V/5V DCF77 time signal station receiver card
- PEX511
- PCI Express DCF77 time signal station receiver card
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 twelve hours (four days in the case of a GPS170PCI card) 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 (or four days in the case of a GPS170PCI card) 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 itself:
- OK
- The clock is synchronized.
- WARN
- The device's clock is free running on the local oscillator. For DCF77 receiver cards 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
HISTORY
The mbg driver first appeared in
OpenBSD 4.1.
AUTHORS
The mbg driver was written by
Marc Balmer
<mbalmer@openbsd.org>.