Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
OPERATION
Revision 2.2
Page - 49
Depending on the IRIG format selected, different types of information may be placed in the IRIG frame.
The Time-of-Year portion is always present and indicates the current system clock time in seconds,
minutes, hours, and day of the year. The IRIG-B120, IRIG-B123, and IRIG-B127 formats include a
straight binary seconds counter which gives the current time of day in seconds. The IRIG-B127 format
also includes the current year as a two-digit number (e.g. 2011 = 11). The IRIG timecode is generated
directly from the system clock, which should be set to UTC.
Either LTC output (LTC1 and/or LTC2) can be configured to one of the four IRIG formats in their
respective menus. See section 4.4.1 for a description of the menu settings. The IRIG signal amplitude
can be controlled by the
Output Level
menu item. When an LTC output has been configured to an IRIG
output mode, both primary and secondary outputs will provide the same IRIG signal.
The 5601MSC can also be configured to the IRIG-B as a time reference. The time reference source
must first be set to IRIG. See section 4.3.4 for information on configuring the time reference source.
The
Irig Mode
menu item selects which IRIG format to use as a reference and can also enable auto
detection. Only IRIG-B127 can provide full date information.
Both IRIG input and output circuitry is balanced. To connect an unbalanced IRIG source to the LTC
input, or to use the LTC outputs to drive an unbalanced IRIG cable, refer to Figure 2-21 for examples
on how to make these connections.
Figure 2-21: IRIG Input and Output Connections
Содержание 5601MSC
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