EEG EN 530 Instruction Manual page 19

EN530 HDTV Smart Encoder IV
Load Default XDS Packet
18
Priority is an optional parameter that allows the output priority of a packet
to be customized. The parameter should not be used for standardized,
commonly used packets, which the Encoder automatically assigns
appropriate priorities. The parameter is useful for custom, user-defined
packets. The default priority for packets that the encoder does not
recognize is 115, which corresponds to a fairly low priority. A typical high
priority value is 30. A packet's numerical priority is inversely proportional
to the frequency with which it is inserted.
Two sample XDS entries follow.
<CTRL+A>P 103 –1 {Evening News} <ENTER> will load and begin
insertion for a current program name packet reading "Evening News." The
packet will be output until a new packet is entered.
<CTRL+A>P 105 00.30.00 4844 <ENTER> will load and begin insertion for
a current program rating packet of TV-PG. The packet will be inserted for the
next thirty minutes. Refer to EIA-608B for a listing of hex codes for other
possible program ratings.
<CTRL+A>P LPacket Duration Content [Holdoff] <ENTER>
Loads an Upstream Priority XDS packet. This is called a "default" packet
because it will be output only when no XDS packet of the specified Class and
Type is present in the incoming video signal. When an upstream packet is
discontinued without a replacement or a Clear packet (two Space characters),
the Encoder will continue insertion of the discontinued packet for a time-out
period of 5 minutes to ensure continuity during program breaks. The default
packet will then be transmitted until the upstream packet is replaced.
The Packet, Duration, and Content parameters are the same as for the local
priority Load XDS Packet command explained on the previous page, except
the Packet Class/Type must be entered with a leading "L".
Holdoff sets the number of seconds after which the default packet will
begin transmission once the five minute upstream time-out period expires.
The default is zero.
Example: <CTRL+A>P L105 –1 4840 <ENTER> will create a default
program rating packet of None. This packet will be inserted beginning 5
minutes after an interruption in upstream program rating data, and will
continue to be transmitted indefinitely until upstream data resumes.
©2000-2007 EEG Enterprises, Inc.