evertz 8083XDS-AD Instruction Manual page 117

There are two XDS packets defined by EIA-608-B for encoding time and date information. The Time of
Day packet (0701) encodes the UTC time and contains a flag bit (DST Flag) that is to be set when
Daylight Saving Time is in effect (i.e. between the first Sunday of April and the Last Sunday of
October). The Time of Day packet must be inserted locally at each affiliate station so that the correct
time is encoded when programs are aired at different times across the network.
The Time Zone packet (0704) encodes the time zone offset from UTC time and contains a flag bit
(DSO Flag) that is to be set when the entire area served by the signal observes Daylight Saving Time.
When the DSO Flag bit is set to Off, it means that the DST Flag bit in the Time Of Day packet will be
ignored by the VCR. The Time Zone packet must be inserted locally at each affiliate in order to encode
the correct time zone offset for the region.
In areas where the TV signal will be received in more than one time zone or in a
region where one part observes Daylight Saving Time and another does not, the
Time Zone packet must not be transmitted. In regions where the Time Zone
packet is not transmitted, viewers will have to manually program their VCRs with
the correct time zone, and whether Daylight Saving Time is observed. Older VCRs
may require the user to also set the local time.
A.4 SETTING THE TIME AND DATE IN THE 8083XDS-AD
The 8083XDS-AD maintains an internal clock that is used to encode the time and date information into
the XDS packets. The preferred way to set the clock in the 8083XDS-AD Caption Encoder is to
connect Linear Time Code (LTC) with the date and time zone information encoded into the user bits
(8083XDS-AD LTC option required). This signal is connected to the 3-pin XLR connector on the rear
panel marked LTC In. It can be derived from a network feed off the satellite, or from a local time code
generator such as the Evertz Model 5010-GPS that is locked to an accurate time reference (e.g. GPS).
Section A.4.1 gives information on how to configure the LTC input correctly.
In order for the 8083XDS-AD to accurately calculate UTC and Local Time, the user must set the Time
zone offset and Daylight Saving information also. If the date information is encoded in the LTC user
bits then the 8083XDS-AD can read this information. Otherwise, the preferred method of setting the
date and time zone information is by using the MetaCast 2 software running on a computer connected
to one of the 8083XDS-AD's serial ports.
A.4.1. Configuring The 8083XDS-AD LTC Input
The 8083XDS-AD can accept Linear Time Code with either UTC or local time. With either UTC or local
time as the input, the 8083XDS-AD's daylight saving time setting will have to be changed twice a year
by MetaCast 2, (see section A.5.6) but the transition is smoother if UTC is used. In addition the 8084
can read date and time zone information that has been encoded in the Leitch CSD5300 encoding
format. The LTC RDR CONFIG item on the Engineering Setup Menu is used to configure the LTC
reader in the 8083XDS-AD. (Press SHIFT+SETUP and then use the
CONFIG menu item. Then press the
The currently selected setting will be flashing. Section 3.1 of the 8083XDS-AD manual gives more
information about using the Engineering Setup Menu.) The front panel time display on the 8083XDS-
AD displays the Local time. In order for the 8083XDS-AD to display the correct local time you must
also set the time zone and DST Flag in the 8083XDS-AD. Section A.5 gives information on how to set
the time zone and Daylight Saving Flag in the 8083XDS-AD using the MetaCast 2 software.
APPLICATION NOTES
8083XDS-AD Analog and SD-SDI XDS Encoder
or keys to view the options available for that menu item.
Revision 1.0.2
key to go to the >LTC RDR
AN-3