evertz 8084 Instruction Manual page 139

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.
B.4 SETTING THE TIME AND DATE IN THE 8084AD
The 8084AD 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 8084AD Caption Encoder is to connect Linear
Time Code (LTC) with the date and time zone information encoded into the user bits (8084 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).
information on how to configure the LTC input correctly.
In order for the 8084AD 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 8084AD 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
8084AD's serial ports.
B.4.1 Configuring The 8084AD LTC Input
The 8084AD can accept Linear Time Code with either UTC or local time. With either UTC or local time
as the input, the 8084AD's daylight saving time setting will have to be changed twice a year by
MetaCast 2, (see section B.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
8084AD. (Press SHIFT+SETUP and then use the
Then press the or
setting will be flashing. Section 3.1 of the 8084AD manual gives more information about using the
Engineering Setup Menu.) The front panel time display on the 8084AD displays the Local time. In
order for the 8084AD to display the correct local time you must also set the time zone and DST Flag in
the 8084AD. Section B.5 gives information on how to set the time zone and Daylight Saving Flag in the
8084AD using the MetaCast 2 software.
APPLICATION NOTE 3
Models 8084/8084AD/8085 Closed Caption Encoder Manual
keys to view the options available for that menu item. The currently selected
Revision 1.6.6
key to go to the >LTC RDR CONFIG menu item.
Section B.4.1 gives
AN3-3