Albedo xGenius - Using PPS; Tod and Frequency References

A
L
B
E
D
O
T
e
l
e
c
o
m
-
J
o
a
n
d
’
À
u
s
t
r
i
a
,
1
1
2
-
B
a
r
c
e
l
o
n
a
-
0
8
0
1
8
-
w
w
w
.
a
l
b
e
d
o
t
e
l
e
c
o
m
.
c
o
m
User Guide
38
The procedure to configure the clock reference input in your xGenius unit is detailed in
the following steps.
1. From the Home panel, go to CONFIG,
The port setup panel is displayed.
2. Go to Reference clock.
3. Configure Input clock to one of Internal, Clock/PCM (Port Ref. In/Out), ToD (Port
Ref. In/Out), PPS (Port Ref. In/Out), PPS (Ref SMB), Ethernet (Port A), Ethernet
(Port B) or GNSS.
4. If you have chosen Clock/PCM (Port Ref. In/Out) in the previous step, configure
Clock/PCM Input, Connector and Termination from the Clock/PCM input inter-
faces menu. If you have chosen PPS (Port Ref. In/Out), PPS (Ref. SMB) or ToD
(Port Ref. In/Out) configure the Input reference delay to compensate for the cable
delay from the PPS/ToD input interfaces menu (See section 2.6.1). If you have
configured GNSS in the previous step, configure Antenna cable delay, Active
GNSS and other GNSS related parameters from the GNSS receiver menu (See
section 2.6.2),
2.6.1. Using PPS / ToD and Frequency References
xGenius includes three different kinds of clock reference. Every class has different
features and they are used for different applications. The parameters to be configured
are also different depending on the clock reference class. Time an phase references
• Reference error: For some reason, the local oscillator is
not able to finish with the locking sequence. This message
should never be displayed under normal operation.
Force holdover Puts the OCXO or Rubidium oscillator in holdover mode.
When this mode is set, The user is allowed to physically
unplug the external clock interface. The equipment, will try to
generate accurate phase and frequency on its own based on
previous data from the reference.
The holdover mode is not available in TCXO units.
Holdover elapsed
time
It accounts for the time from the beginning of the holdover
period. This value should always be smaller than the Holdo-
ver duration. If the Holdover elapsed time becomes higher
than the Holdover duration then the test unit goes to a holdo-
ver timed out state.
Holdover duration This field could be used to configure the amount of time
required to declare a holdover timed out. The default holdo-
ver duration period is 24 hours.
Table 2.9: Oscillator Settings and Status
Result Description