Xds Insertion - EEG EN 530 Instruction Manual

EN530 HDTV Smart Encoder IV

XDS Insertion

Enable XDS Entry
16
Extended Data Services (XDS) is an NTSC Field 2 data channel that provides
information to viewers about the program that is being aired. On SD
broadcasts, XDS is used to transmit program ratings to allow viewer V-chip
filtering of mature content. Although HD broadcasts do not use XDS for V-
chip compliance, XDS data must still be included in compatibility bytes for set
top down-conversion.
The EN530 includes all of the XDS functionality of the broadcast industry's
leading XDS solution, the EN470 Smart Encoder III. XDS data packets can be
loaded into the Encoder's queue with one simple command, and be held for
any specified time period. Each individual packet type can be independently
set for upstream or local priority, and permanent packets can be stored in Non
Volatile Memory and inserted automatically whenever the Encoder is
operating.
Packets are inserted into output video signals using EEG's proprietary
Stochastic Scheduling Algorithm. The Stochastic Scheduling Algorithm is a
finely tuned solution to the Field 2 bandwidth limitations that cause difficulties
in XDS packet transmission. A Priority level is automatically assigned to each
packet based on its XDS Class and Type. The Stochastic Scheduling Algorithm
ensures both that high priority packets like V-chip data and program names are
transmitted frequently enough to be instantly accessible for new viewers, and
that lower priority packets are guaranteed to be inserted periodically, and not
preempted completely.
As per EIA-608B specifications, all available Field 2 space is filled,
rescheduling and regeneration are automatically performed on all upstream
packets, and packet continuations are applied when necessary. Additionally,
upstream XDS program packets will continue to transmit for five minutes after
any non-clearing upstream interruption, such as a commercial break or
undesired outage.
<CTRL+A>O XDS O <ENTER>
This command must be entered to enable a port for XDS input. A port must be
enabled for XDS input in order to accept XDS data and control commands.
The character repeated in the command is a capital o and not a zero.
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