Model 5600MSC Master Clock/SPG Manual
TECHNICAL DESCRIPTIONOPERATION
Revision 1.6 Page 3-9
3.5. CONFIGURING THE INPUT REFERENCES
The INPUT SETUP menu is used to set up various items related to the input references to the
5600MSC. The chart below shows the items available in the
INPUT SETUP menu. Sections 3.5.1 to
3.5.6 give detailed information about each of the sub menus.
FREQUENCY REF
Configures the frequency reference type.
TIME REF
Configures the time reference type.
INPUT VITC LINE
Sets the video line which the VITC reader will look for VITC on.
GENLOCK RANGE
Configures the capture range of the genlock phase locked loop when the
FREQUENCY REF is set to Video ref.
JAM SYSTEM NOW
Forces an abrupt re-locking of the master oscillator to its frequency
reference. This affects the timing of all outputs and should be cautiously.
LOCK CONTROL
Configures whether the 5600MSC will lock to its frequency reference
gradually or suddenly. Also is used to reset the phase detector.
Table 3-1: Top Level of the Input Setup Menu
3.5.1. Configuring the Frequency Reference
INPUT
FREQUENCY REF
GPS freq ref
10 MHz freq ref
Video freq ref
Internal frq ref
The
FREQUENCY REF menu item is used to select the type of frequency
reference being used for the 5600MSC. In all cases the sync and DARS
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
different reference sources and the appropriate reference is supplied, the
phasing of the sync and DARS outputs is affected as shown in Figure 3-2 to
Figure 3-8. Note that the DARS lock source is set using the
AES Lock Type
menu item on the
AES/DARS OUT branch of the OUTPUT menu tree. (see
section 3.6.12.4.)
When set to
GPS freq ref the master oscillator will be locked to frequency
information being acquired from the GPS receiver.
When set to
10 MHz freq ref the master oscillator will be locked to an
incoming 10 MHz or 5 MHz reference connected to the
10 MHz input
connector.
When set to
Video freq ref the master oscillator will be locked to an
incoming NTSC or PAL colour black signal connected to the
GENLOCK
input connector. The GENLOCK RANGE menu item is used to select the
tolerance of the master oscillator lock range when it is attempting to lock to
a video reference. (See section 3.5.4)
When set to
Internal freq ref the master oscillator will be free running. The
accuracy of the internal master oscillator is 0.01ppm that corresponds to a
time drift of about 0.31 seconds per year.
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