Chapter 10:
Appendix
161
v3.3-a 12/07/2022
Chapter 10:
Appendix
10.1 VCS Code
The Virtual Clock Status Code has been created to easily identify the timing status of a device and
easily troubleshoot in case it has failed. The VCS code are also used by the FOCA algorithm to
detect a failure within a timing source and switch to the next available one.
10.1.1 Grand Master (GM VCS Code)
A device in Grand Master is when the timing source is external (i.e., 10MHz/PPS) or from a non-
PTP source such as GNSS.
Device
Status
Message
Clock
Class
Active
reference
Description
VSC
-
HO
...
V
S
C
-10000
OK
Locked
6
GM: Front-
panel
Everything is OK for GM device
V
S
C
-10101
CRITICAL
Unlocked: 10MHz
not present
187
GM:
Internal
Oscillator
The 10MHz signal is not properly connected to the
GM (or provide too low voltage, bad frequency,
etc...)
V
S
C
-10102
CRITICAL
Unlocked: PPS not
present
187
GM:
Internal
Oscillator
The PPS signal is not properly connected to the GM
(or provide too low voltage)
V
S
C
-10103
CRITICAL
Unlocked:
10MHz+PPS
not
present
187
GM:
Internal
Oscillator
10MHz and PPS signals are not properly connected
to the GM (or provide too low voltage)
V
S
C
-10104
CRITICAL
Unlocked: 10MHz
not stable
187
GM:
Internal
Oscillator
Timeout in locking or DAC blocked to the limit.
~99% of the case because 10MHz are not stable or
correct and thus tmgr reach a timeout count
V
S
C
-10110
WARNING
Locked: PPS not
present
6
GM: Front-
panel
In case we are using an Atomic Clock as the main
reference and someone has unplugged the PPS
cable we might have some problem on the next
reboot. PPS defined as not mandatory by user
