evertz 5700MSC-IP - Configuring the Frequency Reference

5700MSC-IP
IP Network Grand Master Clock & Video Master Clock System
Page - 74 Revision 0.2
5.3.1. Configuring the Frequency Reference
5.3.1.1. Selecting the Reference Source
INPUT
The Reference Src menu item in the Frequency Ref menu is used to select
the frequency reference that the 5700MSC-IP
will use to lock its internal
oscillator. All outputs are driven from a common oscillator and therefore are
clock locked to each other (i.e. they do not drift with respect to each other).
When set to the different possible reference sources and the appropriate
reference is supplied, the phasing of the video and DARS outputs is
affected.
When set to GNSS the 5700MSC-IP will lock its ovenized oscillator to the
1pps pulse from the GNSS smart antenna. Selecting this option forces the
Genlock Range to Narrow. All outputs are phased with respect to a specific
date in GNSS time. This forces the time reference to GNSS time. The
GNSS-disciplined internal oscillator will maintain superb long-term accuracy.
When set to Ten MHz the 5700MSC-IP will look for a 10MHz
or 5MHz
frequency reference on the reference loop input. It will lock in either Narrow
or Wide mode, depending on the Genlock Range
setting. The 10MHz or
5MHz reference supplies no phase information and the phase of the outputs
will change if the unit is powered down and rebooted. The phase between
different 5700MSC-IP units locked to 5MHz or 10MHz will not be the same.
When set to Video the 5700MSC-IP will lock to a valid black burst or tri-level
video signal applied to the reference loop inputs. The Genlock Range menu
item is used to select the tolerance of the master oscillator lock range. Note
that the 5700MSC-IP requires a colorburst on NTSC and PAL references,
with a SCH error of less than 35º. Burst is not required for Slo-PAL bi-level
references.
When set to Internal the 5700MSC-IP will free-run on its internal ovenized
oscillator. This forces the Genlock Range
to Narrow. The stability of this
ovenized oscillator is 0.01ppm, which corresponds to a time drift of about
0.31 seconds per year.
Frequency Ref
Reference Src
GNSS Mobile
GNSS Fixed
Ten MHz
Video
Internal
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