evertz 5601MSC, Инструкция по эксплуатации, Страница: 21 / 196

Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
OVERVIEW
Revision 2.2
Page - 5
There are two other menu items that control how the 5601MSC locks to its reference. These are
Genlock Range and Lock type . Press the HELP button for a short description on what each menu item
does. For a detailed description see section 4.3.
1.1.5. Selecting and Connecting Time References
Once the desired frequency reference has been selected and the antenna/reference connections have
been made, the Time reference should be selected. The time reference is how the 5601MSC obtains
time and date for the system clock. Press the
INPUT button to access the input menu. Return to the
root level by pressing ESC a couple times. Select the Time menu using the control knob and press
SELECT . Use the Reference Src menu item to choose a time reference for the unit. There are other
menu items that control how the 5601MSC handles the time reference. Press the HELP button to
identify the function of each item or see section 4.3.4 for more detail.
•
GPS – When a GPS receiver ( GP option) is connected to the unit, it can obtain continuous time
and date updates from GPS. If the frequency reference has been set to GPS, the time reference
will also be forced to GPS. However it is also possible to use a frequency reference other than
GPS (such as video) and still use GPS as a very accurate time reference.
•
Modem – If the unit is equipped with a modem ( M option), the 5601MSC can synchronize its
system time and date by dialling out to a high-level time reference provider such as the NRC or
NIST ACTS. The high frequency stability of the 5601MSC will ensure that the acquired time is
accurate for a maximum period of 10 days; however the unit can be configured to dial out every
day, or once per week if desired. See section 4.5.6.
•
Syncro – If the 5601MSC is paired with another unit and connected through a 5601ACO2
automatic changeover it can acquire time and date updates from the master unit. Therefore in
dual redundant installations only one GPS antenna (or other high-level time source) is required
for both units. Syncro slave time mode must be selected in the GENERAL menu before this
selection will work. See section 3.4 for more information on Syncro.
•
LTC – Selecting this option will cause the 5601MSC to obtain its system time from the LTC input
on the GPIO connector on the back of the unit. It can also decode date information from the
user bits in several different formats.
•
IRIG – If the IRIG option is installed, the 5601MSC can acquire time and date from an IRIG-B
signal applied to the LTC/IRIG input on the GPIO connector. Refer to section 2.3.3.6.
•
VITC – The 5601MSC will look for Vertical Interval Time Code on the selected line of a black
burst signal that is applied to the reference loop input. It can also decode date information from
the user bits in several different formats. In order to use VITC as a time reference, the frequency
reference must first be set to
Video .
•
SNTP – If the NTP ( T ) option is installed, the 5601MSC can synchronize once daily to time and
date from an NTP server. See section 2.3.3.7 for more information.
•
None – The 5601MSC will not acquire time from any outside source and the time and date must
be manually entered using the front panel in the GENERAL menu. The high frequency stability
of the unit and battery backup will ensure the 5601MSC keeps fairly accurate time.