Chapter 2 Introduction
Digital Program Insertion Support
© 2012 Harmonic Inc.
14
Electra 1000, Version 3.0, Rev M
Table 2-4 provides DiviTrack IP pool specifications. See the NMX help for information about
configuring DiviTrackIP.
2.6
Digital Program Insertion Support
The Electra 1000 encoder supports digital program insertion (DPI). Electra 1000 accepts
external automation system DPI commands (triggers) via Ethernet. These commands are sent
via the SCTE 104 protocol, and result in the encoder placing SCTE 35 DPI messages in the
outgoing MPEG Transport Stream (TS). (The Electra 1000 also accepts commands via the
SCTE DVS/525 draft protocol.)
The resulting messages carry metadata used by downstream content insertion equipment to
choose and insert the proper content. When using an external automation system, that
system provides the metadata values via the SCTE 104 commands. The metadata is included
in the resulting SCTE 35 messages, which are placed in the outgoing MPEG Transport Stream.
2.7 Audio
Mode
Change Control Through VANC
The Electra 1000 (with AHC-RAC audio adapters mounted) can support one 5.1 channel
AAC audio stream plus one stereo audio stream maximum per encoder. Changes in the
audio coding may be controlled through messages in VANC when the AHC-RAC is suitably
provisioned.
2.8
Standard Closed-Captions Support
The CEA-708 closed captions include space for CEA-608 data. The encoder can receive
them either via serial port (compliant with SMPTE 333M , one service per chassis), or in
VANC (compliant with SMPTE 334-1, one service per encoder card mounted). Extraction of
CEA-608 data from Line 21 of SD video is also supported.
The placement of CEA-708 captions into the MPEG-2 video ES is compliant with ATSC A/53
Part 4. Placement of CEA-608 data is available compliant with a variety of industry standard
and proprietary methods. Consult the NMX or SAG online help for more details.
Table 2-4: DiviTrackIP Pool Specifications
Parameter
Description
Maximum number of DiviTrackIP pools per ProStream
1000
8
Maximum number of VBR services
128
Maximum number of channels per pool
64
Minimum stream bit rate
300 Kbps
Maximum stream bit rate
MPEG 2 encoders: 15 Mbit/s
SD AVC encoders: 8 Mbit/s
HD AVC encoders: 24 Mbit/s
Maximum CPC 2.0 bitrate
Maximum CPC 2.5 bitrate
40 Mbit/s
100 Mbit/s