Appendix F FLEX Decoding Module
Ancillary Data Specifications
© 2012 Harmonic Inc.
59
Electra 1000, Version 3.0, Rev M
See Table F-5 on page 59 for information on MPEG-L2 resource considerations.
F.5 Ancillary Data Specifications
A multichannel encoder equipped with FLEX is essentially receiving and outputting
compressed streams. Therefore the terminology used regarding ancillary data can be
incorrect or misleading. VBI data is not applicable to fully digital signals, but is used by user
habit. The FLEX module does not re-create any of the ancillary data, it simply passes it intact
as packets of bits, to the associate encoder’s TS output.
Table F-6 describes the ancillary data specifications supported by the FLEX module.
F.6 Input Specifications
Table F-7 describes the input specifications FLEX module
a.
Enabling Multichannel downmixing allocates resources for downmixing, resulting in resource
usage equivalent to 3 x Stereo.
Table F-5: MPEG-L2 Resource Considerations
Input Format
Audio Input (into
card)
Decoding
Mode
Result
Resource Usage
Equivalent
MPEG-1 Layer
II
Mono
Mono
Audio on left
channel. Silence on
right channel.
Stereo
Stereo
Stereo
Mono
Audio on both
channels.
Stereo
Table F-6: Ancillary Data Specifications
Feature
Support
Vertical Interval Data
Services (Pass through only)
WST (Teletext), Inverted WST, WSS, VPS, AFD and bar data,
VITC, Closed Captioning per CEA-608 and 708, AMOL and
TV Guide data.
Number of channels
4 PIDS
Table F-7: Input Specifications
Feature
Support
Transport stream Inputs
MPEG-2 TS
ASI interface (optional module)
Connector
4x BNC, 75
Ω
MPEG format
188 Bytes per TS packet