MANUAL P/N 900000019 REV G
13
3
Operating Instructions
3.1 Scope of Section
Section 3 provides operating instructions for the Multi-Channel Time Distribution
Unit (Model TDU-310).
3.2 Operation
To operate the unit, apply power to the unit and the Power indicator should
illuminate.
3.2.1 Automatic Selection of Signal Sources
Set the ‘Reference Select’ switch to ‘Auto’. The following LEDS should
illuminate:
•
Reference A Available
•
Reference B Available
•
Auto
•
Reference A Online
In this mode, Reference A is selected unless the TDU-310 detects a missing
signal on
ANY
of the three reference signal inputs (1 PPS, Time Code 1 (HQ),
and Time Code 2 (BCD))
OR
the Time Fault Discrete line is pulled low. If any of
these conditions is met, the TDU-310 will switch
ALL
outputs to be driven from
the Reference B input. If both Reference A
AND
Reference B are faulty, the
outputs will be switched to Reference A.
3.2.2 Manual Selection of Reference A as Signal Source
Set the ‘Reference Select’ switch to ‘A’. The following LEDS should illuminate:
•
Reference A Available
•
Reference B Available
•
Reference A Online
3.2.3 Manual Selection of Reference B as Signal Source
Set the ‘Reference Select’ switch to ‘B’. The following LEDS should illuminate:
•
Reference A Available
•
Reference B Available
•
Reference B Online
