GPS7 GPS Synchronization and Timecode module
Task Scheduler
. The task scheduler is responsible for triggering scheduled
events at the appropriate time. This includes DST changes, deferred leap second
adjustments, and triggered alarm outputs.
NTP Server. The GPS7 includes an implementation of the Simple Network Time
Protocol, using the network interface of the TG8000 mainframe. The NTP server
is automati
c; when the Master time is set to GPS and the GPS7 acquires a valid
time, the server will respond with valid NTP packets to time requests from NTP
clients. When the M aster time is set to GPS, the server always responds with U T C
time only. It is the responsibility of the NTP client (PC workstation, file server,
etc.) to be configured with the correct time zone offset. The NTP Server will work
only if the sys t em is locked to a GPS/GLONASS signal
When us ing VITC or LTC input as the time reference, the NTP service is not
available.
TC Offset *. Every timecode output has an independent offset (hours, minutes,
seconds, frames) that can be added to the value of the selected timecode source.
TC Engine. Thetimecodeenginerunsattheratespecified through the user
interface and generates the actual timecode bits needed for each output.
LTC. The GPS7 module has four independent linear timecode outputs. Each
output can be set independently with regard to timecode format, module timing,
and timecode delay.
Analog Black. The GPS7 module has three analog sync outputs. Each output
ca
nbeconfigured as NTSC or PAL black burst (with optional VITC insertion)
or HD trilevel sync. The BG7 module has four analog sync outputs which can
be similarly configured.
HD-SDI. The standard HDVG7 module has one HD-SDI test signal generator
(with two outputs), for which ancillary timecode (ATC) can be added. If Option
BK is available, then there are two independent HD-SDI test s ignal generators
available.
Program Time. As an alternate to the local time of day, a program time counter
can b e used as a timecode source for any output. This counter can represent
elapsed time, such as the timecode associated with program content during t he
editing process, for example.
Reset Value. The program time counter will start counting from the specified
reset value. Program time can be reset to this value at any time using either the
user interface or a general purpose interface (GPI) input.
TG8000 Multiformat Test Signal Generator User Manual 3–111
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