1Pps And 10 Mhz Outputs - Spectracom SecureSync User Reference Manual

Rb (Rubidium)
High performance OCXO
Standard OCXO
TXCO
Table 3-5:
The length of the allowed Holdover Timeout period is displayed and configured in seconds. The
table below provides example conversions for typically desired Holdover periods.
Desired Holdover Length Holdover Length (in seconds) to be entered
2 hours
24 hours
7 days
30 days
1 year
Table 3-6:
Configuring a Holdover value exceeding 30 days could result in a one second time error in the UTC
or Local timescales until an external reference (GNSS or IRIG input) is restored or a manually con-
figured Leap Second is asserted by a user (leap seconds do not affect the GPS and TAI time
scales).
If no external references (such as GNSS or IRIG) are available when a Leap Second is scheduled
to occur, manual Leap Seconds can also be applied to the UTC or Local time base in the "Set Leap
Second" table located in the MANAGEMENT/OTHER/Time Management page.
For more information on Leap Seconds, refer to "Leap Second Occurrence" on page 272 and "Con-
figuring a Leap Second Correction" on page 173.
3.6.12 1PPS and 10 MHz Outputs
The SecureSync base model includes one 1PPS output and one 10 MHz output. Additional 1PPS
and frequency outputs are available with option cards. To configure these outputs, navigate to:
CHAPTER •
3 SecureSync User Reference Guide Rev. 18
Oscillator Type Typ. Error Rates after 4 hrs Typ. Error Rates after 24 hrs
0.2 μs (nominal)
0.5 μs (nominal)
1 μs (nominal)
12 μs (nominal)
Estimated oscillator error rates during Holdover
7200 seconds (default value)
86 400
604 800
2 419 200
29 030 400
Typical Holdover lengths in seconds
NOTE – Due to Leap Seconds that are periodically inserted into the UTC and Local
timescales, it is not normally recommended to exceed 30 days of Holdover without
an external reference that can supply Leap Second information being applied (such
as GNSS).
3.6 OTHER Setup Pages
1 μs (nominal)
10 μs (nominal)
25 μs (nominal)
450 μs (nominal)
197