REFERENCES - Timecode
For example, the standard 50 foot RG-59 antenna cable x 1.24 nS/foot = 62 nS of Antenna
Cable Delay.
Or, using meters, the standard 15.24 meter RG-59 antenna cable x 4.06 nS/meter = 62 nS
of Antenna Cable Delay.
Note:
Use the
Cable Delay
setting on the
REFERENCES - Timecode
page to compensate for
the length of the Timecode Output cable. Avoid using
Antenna Cable Delay
for that purpose.
REFERENCES - Timecode
Use this page to configure the timecode input and output on the SyncServer.
Also see
IRIG In (Timecode In)
(on page 118) and
IRIG Out (Timecode Out)
(on page
119).
Timecode Configuration
Status:
Reports "locked" when the Timecode Input signal and configuration are both valid.
Otherwise it reports "unlocked".
Configure the
Timecode Input
setting to match the input signal on the
IRIG In
connector.
n
If the Timecode Input is marked "without YR", and there are no other Input References or
synchronizing NTP associations (the default NTP servers on
NTP - Assoc
page), verify
that the time SyncServer includes the correct year. If needed, manually set the year. See
in
Setting the Time Manually
(on page 177).
Note: IRIG B 1344 provides a Leap Indicator warning during the minute preceding a leap
second insertion/deletion. If a leap second adjustment occurs while the SyncServer is syn-
chronized to IRIG B 1344 *, NTP clients that don't poll the SyncServer during this one-
minute warning period may be off by approximately one second until they synchronize to the
new time. If the Maximum Poll Interval of the NTP clients is sufficiently shorter than one
minute (e.g., 16 or 32 seconds), this scenario is less likely to occur.
*The "SyncServer is locked to IRIG B 1344" when Hardware Clock locked to the 1344 time-
code input and the Hardware Clock is the "synchronizing" NTP association for the NTP dae-
mon.
Timecode Output
Use the
Timecode Output
to configure the signal type on the
IRIG Out
connector.
The
Cable Delay
and
Output Type
settings only apply to the
Timecode Output
.
Cable Delay (nS):
Compensates for delays caused by the length of the cable on the IRIG Out
connector. Use the table below to calculate the Cable Delay by selecting the signal propaga-
tion rate for the type of cable and multiplying it by the length of the cable.
Type
Rate per foot
Rate per meter
RG-58
1.4 nS/foot
4.59 nS/meter
RG-59
1.24 nS/foot
4.06 nS/meter
For example, a 50 foot length of RG-59 cable x 1.24 nS/foot = 62 nS of
Cable Delay
.
997-01520-02 Rev. F1
..........................................................................
Page 71
